Asia-Pacific Journal of Chemical Engineering最新文献

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Efficient removal of emerging pollutant oxytetracycline by cost-effective biochar–hydroxyapatite composite 利用具有成本效益的生物炭-羟基磷灰石复合材料高效去除新出现的污染物土霉素
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-29 DOI: 10.1002/apj.3124
Quang Minh Tran, Phuong Thu Le, Thu Phuong Nguyen, Hong Nam Nguyen, Thi Hai Do, Trung Dung Nguyen, Thi Mai Thanh Dinh
{"title":"Efficient removal of emerging pollutant oxytetracycline by cost-effective biochar–hydroxyapatite composite","authors":"Quang Minh Tran,&nbsp;Phuong Thu Le,&nbsp;Thu Phuong Nguyen,&nbsp;Hong Nam Nguyen,&nbsp;Thi Hai Do,&nbsp;Trung Dung Nguyen,&nbsp;Thi Mai Thanh Dinh","doi":"10.1002/apj.3124","DOIUrl":"10.1002/apj.3124","url":null,"abstract":"<p>Biochar (BC) and hydroxyapatite (HAp) are widely used in environmental remediation due to their high adsorption capacity, porous structure, large specific surface area, chemical stability, non-toxicity, and low solubility. Combining BC and HAp is a green and effective strategy for creating new adsorbents (BCH) that have a synergistic impact on wastewater treatment. In this study, BCH composites derived from apatite ore and macadamia nut shells were synthesized by the wet impregnation method to remove oxytetracycline (OTC) from aqueous solutions. The BC-HAp composite with a ratio of 10:1 (by weight) was the most effective material for removing OTC. The Redlich–Peterson model achieved the highest correlation coefficient among the four models tested (Freundlich, Langmuir, Temkin, and Redlich–Peterson). The maximum adsorption capacity calculated with the Langmuir isotherm was 49.59 mg g<sup>−1</sup>. It was found that the adsorption process was significantly affected by the solution pH. The bipolar form of the drug was found to be OTC<sup>±</sup>, and the adsorption was most effective in solutions with a pH of 6. The OTC adsorption dominant mechanisms on nanocomposites could be electrostatic attraction, hydrogen bonding formation, surface complexation, or ion exchange. Therefore, the BCH composite showed great potential for removing OTC pollutants in a cost-effective, and environmentally friendly manner.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 6","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A review of oil spill dynamics: Statistics, impacts, countermeasures, and weathering behaviors 溢油动态回顾:统计、影响、对策和风化行为
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-28 DOI: 10.1002/apj.3128
Oshadi Hettithanthri, Thi Bang Tuyen Nguyen, Thomas Fiedler, Chi Phan, Meththika Vithanage, Shiran Pallewatta, Thi My Linh Nguyen, Phuoc Quy An Nguyen, Nanthi Bolan
{"title":"A review of oil spill dynamics: Statistics, impacts, countermeasures, and weathering behaviors","authors":"Oshadi Hettithanthri,&nbsp;Thi Bang Tuyen Nguyen,&nbsp;Thomas Fiedler,&nbsp;Chi Phan,&nbsp;Meththika Vithanage,&nbsp;Shiran Pallewatta,&nbsp;Thi My Linh Nguyen,&nbsp;Phuoc Quy An Nguyen,&nbsp;Nanthi Bolan","doi":"10.1002/apj.3128","DOIUrl":"10.1002/apj.3128","url":null,"abstract":"<p>Oil spills pose significant threats to marine and freshwater environments, impacting ecosystems and drinking water sources. The present review incorporated an up-to-date statistical analysis of the oil spills globally including the types and sources of oil spills and the main habitats affected by the past incidents. It presented immediate and long-term effects on aquatic organisms and habitats highlighting the necessity for action to protect the aquatic environment. The paper also elucidated a range of effective remediation and cleanup methods, presenting a comprehensive toolkit to mitigate ecological damage. Noticeably, the review identified crucial knowledge gaps in the literature: (i) the absence of marine plastic pollution in studies on oil spill impacts and (ii) the absence of a modeling framework that considers the presence of microplastics in the spillage region and their impacts on the overall weathering rate. From synthesizing essential knowledge on oil spill dynamics and identifying the knowledge gap in the literature, this review aims to enhance understanding and guide future research.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 6","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/apj.3128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Preparation of calcium aluminate and spinel by hydrolysis and calcination from secondary aluminum dross 通过水解和煅烧从二次铝渣中制备铝酸钙和尖晶石
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-28 DOI: 10.1002/apj.3117
Yuqin Zhao, Zhengping Zuo, Zhanbing Li, Jianbo Zhang, Wen Fen Wu, Wei Ping Ma, Ganyu Zhu, Shaopeng Li, Fei Wang
{"title":"Preparation of calcium aluminate and spinel by hydrolysis and calcination from secondary aluminum dross","authors":"Yuqin Zhao,&nbsp;Zhengping Zuo,&nbsp;Zhanbing Li,&nbsp;Jianbo Zhang,&nbsp;Wen Fen Wu,&nbsp;Wei Ping Ma,&nbsp;Ganyu Zhu,&nbsp;Shaopeng Li,&nbsp;Fei Wang","doi":"10.1002/apj.3117","DOIUrl":"10.1002/apj.3117","url":null,"abstract":"<p>The direct extraction of alumina from secondary aluminum dross (SAD), which is a dangerous solid waste, is difficult. Moreover, this process easily produces a large amount of solid waste residue, which is not easily utilized. In this paper, a new green process was developed to prepare calcium aluminate and Mg-Al spinel from SAD by hydrolysis–calcification roasting. The effects of calcium oxide (CaO) content, sintering temperature, and holding time on the properties of calcium aluminate were investigated by single-factor experiments. The phase transformation mechanism of calcium aluminate was studied by thermodynamic analysis, X-ray diffraction analysis, X-ray fluorescence spectroscopy, and scanning electron microscopy. Under the optimal conditions (Ca/Al molar ratio of 0.8, sintering temperature of 1300°C, and holding time of 2 h), the main calcium aluminate phases are CaAl<sub>2</sub>O<sub>4</sub> and Ca<sub>2</sub>Al<sub>2</sub>SiO<sub>7</sub>, the soluble alumina content of the calcium aluminate sample is 49.71 wt.%, and the main phases of the acid-insoluble residue are Mg-Al spinel and a very small amount of CaTiO<sub>3</sub>. The Ca/Al ratio is the key factor affecting the calcium aluminate phase—with increasing Ca/Al ratio, the calcium aluminate phase is transformed from CaAl<sub>4</sub>O<sub>7</sub> to CaAl<sub>2</sub>O<sub>4</sub> and eventually to Ca<sub>12</sub>Al<sub>14</sub>O<sub>33</sub>, and the Si-containing phase changes from Ca<sub>2</sub>Al<sub>2</sub>SiO<sub>7</sub> to CaSiO<sub>4</sub>.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 6","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141866152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the influence of unloading disturbance of initial load stress on the microstructure and thermodynamic behavior of granular coal 研究初始载荷应力的卸载扰动对粒状煤微观结构和热力学行为的影响
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-25 DOI: 10.1002/apj.3130
Hui-yong Niu, Si-wei Sun, Qing-qing Sun, Hai-yan Wang, Hong-Yu Pan, Xi Yang, Xiao-dong Yu
{"title":"Study on the influence of unloading disturbance of initial load stress on the microstructure and thermodynamic behavior of granular coal","authors":"Hui-yong Niu,&nbsp;Si-wei Sun,&nbsp;Qing-qing Sun,&nbsp;Hai-yan Wang,&nbsp;Hong-Yu Pan,&nbsp;Xi Yang,&nbsp;Xiao-dong Yu","doi":"10.1002/apj.3130","DOIUrl":"10.1002/apj.3130","url":null,"abstract":"<p>With the advancement of coal mining, the pre-mining stress on the coal seam increases. After mining, the coal seam fractures and unloads, leaving granular coal in the goaf with a high risk of spontaneous combustion. To investigate the oxidation behavior and underlying mechanisms of granular coal in goafs at various depths, fresh coal was subjected to static stresses ranging from 4 to 16 MPa and then underwent unloading treatment to generate granular coal with varying initial stresses. Subsequently, simulations of granular coal in goafs at various depths were conducted. Structural characteristics (pores and functional groups) and oxidation heat production performance of the granular coal after unloading were analyzed using a low-temperature nitrogen adsorption instrument, a Fourier infrared spectrometer, and a simultaneous thermal analysis system. The findings suggest that as the initial loading stress increases, the number of micropores and mesopores within the unloaded bulk coal decreases, while the number of macropores increases. Furthermore, important oxidation-active structures, including -OH, -CH<sub>3</sub>, -CH<sub>2</sub>-, C=O, and -COOH, gradually increase, with a slight decrease observed after exceeding 8 MPa. The pressure-unloading process leads to a gradual decrease in the characteristic temperature of the bulk coal, with the characteristic temperature increasing after exceeding 8 MPa, although it still remains lower than that of the raw coal. As the burial depth of the goaf increases, the oxidation behavior of the unloaded granular coal becomes more pronounced, leading to an increased tendency and risk of spontaneous combustion. If the initial loading stress on deep coal seams is excessive, the oxidation heat production capacity of the resulting unloaded granular coal may be slightly diminished, yet it still poses a significant disaster risk. The research results can provide valuable insights for mitigating and managing spontaneous combustion risks in coal seam mining operations conducted at different depths.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 6","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141777541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Construction of ternary heterostructure of zeolite/Fe3O4/CuS/CuWO4 as a reusable: Characterization studies 构建可重复使用的沸石/Fe3O4/CuS/CuWO4 三元异质结构:表征研究
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-25 DOI: 10.1002/apj.3125
Alyaa Hussein Ali, Abeer I. Alwared
{"title":"Construction of ternary heterostructure of zeolite/Fe3O4/CuS/CuWO4 as a reusable: Characterization studies","authors":"Alyaa Hussein Ali,&nbsp;Abeer I. Alwared","doi":"10.1002/apj.3125","DOIUrl":"10.1002/apj.3125","url":null,"abstract":"<p>The presence of pharmaceutical pollutants in the environment has become a growing concern due to their persistence and toxic nature. In response to this issue, semiconductor photocatalyst materials have emerged as promising candidates for environmental pollutant removal, particularly under solar light irradiation. In this study, we developed a novel zeolite/Fe<sub>3</sub>O<sub>4</sub>/CuS/CuWO<sub>4</sub> heterojunction nanocomposite through a simple and facile method. The fabrication process involved a multistep approach wherein Fe<sub>3</sub>O<sub>4</sub>, CuS, and CuWO<sub>4</sub> were incorporated onto the surface of pure zeolite nanoparticles. X-ray diffraction, scanning electron microscope, transmission electron microscope, ultraviolet–visible diffuse reflectance spectroscopy, Fourier transform infrared, photoluminescence, and vibrating sample magnetometry were analyzed. The results demonstrated that the zeolite/Fe<sub>3</sub>O<sub>4</sub>/CuS/CuWO<sub>4</sub> heterojunction nanocomposite exhibited a synergistic integration of excellent properties, indicative of the successful construction of a heterostructure within the nanocomposite. Furthermore, the photocatalytic efficiency of the nanocomposite was evaluated for the degradation of the pharmaceutical pollutant fluoroquinolone levofloxacin (LEVO), and it outperformed individual photocatalysts. Notably, the zeolite/Fe<sub>3</sub>O<sub>4/</sub>CuS/CuWO<sub>4</sub> nanocomposite achieved an impressive degradation rate of approximately 82.67% of LEVO after 120 min of exposure. Importantly, the synthesized nanocomposite demonstrated excellent reusability, with a photodegradation efficiency of 60.45% after the fifth cycle of LEVO degradation, as there was no significant loss in photocatalytic activity over repeated cycles. Furthermore the highest total organic carbon removal efficiency estimated is 57.43% for heterojunction nanocomposite. These findings highlight the potential of the zeolite/Fe<sub>3</sub>O<sub>4</sub>/CuS/CuWO<sub>4</sub> heterojunction nanocomposite as an effective, eco-friendly photocatalyst for pharmaceutical pollutant removal from the environment.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141786206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimizing of heat transfer and flow characteristics within a roughened solar air heater duct with compound turbulators 利用复合涡轮优化粗糙化太阳能空气加热器管道内的传热和流动特性
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-23 DOI: 10.1002/apj.3126
Kadhim Al-Chlaihawi, Bahjat Hassan Alyas, Banan Najim Abdullah
{"title":"Optimizing of heat transfer and flow characteristics within a roughened solar air heater duct with compound turbulators","authors":"Kadhim Al-Chlaihawi,&nbsp;Bahjat Hassan Alyas,&nbsp;Banan Najim Abdullah","doi":"10.1002/apj.3126","DOIUrl":"10.1002/apj.3126","url":null,"abstract":"<p>Thermal systems for solar air heating have been widely used in both industrial and residential contexts, and are essential for converting and recovering solar energy. Thermal performance in solar air heaters (SAHs) can be improved through the repetitive application of artificial roughness to the surfaces. This research work includes a numerical evaluation of SAH performance with artificial rough surfaces made up of combined transverse trapezoidal ribs and chamfered grooves. The ANSYS Fluent software version 2023 R1 was used to simulate SAH with varying relative roughness pitch (\u0000<span></span><math>\u0000 <mi>P</mi>\u0000 <mo>/</mo>\u0000 <mi>e</mi>\u0000 <mo>=</mo>\u0000 <mn>7.14</mn>\u0000 <mo>−</mo>\u0000 <mn>35.71</mn></math>), relative roughness heights (\u0000<span></span><math>\u0000 <mi>e</mi>\u0000 <mo>/</mo>\u0000 <msub>\u0000 <mi>D</mi>\u0000 <mi>h</mi>\u0000 </msub>\u0000 <mo>=</mo>\u0000 <mn>.021</mn>\u0000 <mo>−</mo>\u0000 <mn>.042</mn></math>), and Reynolds number (\u0000<span></span><math>\u0000 <mi>Re</mi>\u0000 <mo>=</mo>\u0000 <mn>6000</mn>\u0000 <mo>−</mo>\u0000 <mn>18</mn>\u0000 <mspace></mspace>\u0000 <mn>000</mn></math>). The RNG \u0000<span></span><math>\u0000 <mi>k</mi>\u0000 <mo>−</mo>\u0000 <mi>ϵ</mi></math> model was chosen to forecast an enhancement in Nusselt number (\u0000<span></span><math>\u0000 <mi>Nu</mi></math>), friction factor (\u0000<span></span><math>\u0000 <mi>f</mi></math>), and thermohydraulic performance factor (TPF) for the proposed roughness. Out of multiple roughness parameters analyzed, it was determined that the compound turbulator with \u0000<span></span><math>\u0000 <mi>P</mi>\u0000 <mo>/</mo>\u0000 <mi>e</mi>\u0000 <mo>=</mo>\u0000 <mn>10.71</mn></math> and \u0000<span></span><math>\u0000 <mi>e</mi>\u0000 <mo>/</mo>\u0000 <msub>\u0000 <mi>D</mi>\u0000 <mi>h</mi>\u0000 </msub>\u0000 <mo>=</mo>\u0000 <mn>.042</mn></math>, were the most effective. The TPF for this scenario was determined to be 2.12 at \u0000<span></span><math>\u0000 <mi>Re</mi>\u0000 <mo>=</mo>\u0000 <mn>6000</mn></math>. Finally, a numerical based empirical correlations for \u0000<span></span><math>\u0000 <mi>Nu</mi></math> and \u0000<span></span><math>\u0000 <mi>f</mi></math> in terms of Re, \u0000<span></span><math>\u0000 <mi>P</mi>\u0000 <mo>/</mo>\u0000 <mi>e</mi></math>, and \u0000<span></span><math>\u0000 <mi>e</mi>\u0000 <mo>/</mo>\u0000 <msub>\u0000 <mi>D</mi>\u0000 <mi>h</mi>\u0000 </msub></math> were developed.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141777542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical simulation on the pressure, turbulence, and λ 2 vortex characteristics within the annular symmetric jet process under different vacuum degrees 不同真空度下环形对称射流过程中的压力、湍流和 λ2$$ {lambda}_2$ 涡流特性的数值模拟
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-22 DOI: 10.1002/apj.3127
Xinjie Chai, Yuxi Hu, Lishan Gao, Facheng Qiu, Zhiliang Cheng
{"title":"Numerical simulation on the pressure, turbulence, and \u0000\u0000 \u0000 λ\u0000 2\u0000 vortex characteristics within the annular symmetric jet process under different vacuum degrees","authors":"Xinjie Chai,&nbsp;Yuxi Hu,&nbsp;Lishan Gao,&nbsp;Facheng Qiu,&nbsp;Zhiliang Cheng","doi":"10.1002/apj.3127","DOIUrl":"10.1002/apj.3127","url":null,"abstract":"<p>The jet impingement flash technology represents a paramount research subject in the domain of heat and mass transfer. To augment its commercial potential, the conjunction of annular multi-aperture jet impingement with negative pressure flash evaporation is introduced in this study. The employment of an annular nozzle array is integral to the enhancement of the heat and mass transfer efficiency between the phases. The Realizable k-ε model is used in this study. The negative pressure flash vaporization model was also developed by introducing a mass source term and an energy source term based on the Mixture model. The flow characteristics are characterized using numerical simulation. Additionally, the λ<sub>2</sub> vortex identification criterion is investigated the vortex structure. The simulation results exhibit good agreement with experimental findings, demonstrating that a higher initial vacuum leads to a stronger flashing effect and a more chaotic movement of the flow group within the flow field. Thus, this study provides a reference method for the structural design and optimization of annular symmetric jet impingement negative pressure deammonia chemical equipment for engineering applications.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141777544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancing the catalytic performance of Cu/ZnO/Al2O3 catalyst in methanol synthesis from biomass-derived syngas with CeO2, MnO2 and ZrO2 as promoters 以 CeO2、MnO2 和 ZrO2 为促进剂提高 Cu/ZnO/Al2O3 催化剂在生物质合成气合成甲醇中的催化性能
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-14 DOI: 10.1002/apj.3121
Sabar Pangihutan Simanungkalit, Chiemeka Onyeka Okoye, Zhezi Zhang, Junzhi Wu, Dongke Zhang
{"title":"Enhancing the catalytic performance of Cu/ZnO/Al2O3 catalyst in methanol synthesis from biomass-derived syngas with CeO2, MnO2 and ZrO2 as promoters","authors":"Sabar Pangihutan Simanungkalit,&nbsp;Chiemeka Onyeka Okoye,&nbsp;Zhezi Zhang,&nbsp;Junzhi Wu,&nbsp;Dongke Zhang","doi":"10.1002/apj.3121","DOIUrl":"10.1002/apj.3121","url":null,"abstract":"<p>The performance of Cu/ZnO/Al<sub>2</sub>O<sub>3</sub> (CZA) catalysts promoted by addition of CeO<sub>2</sub>, MnO<sub>2</sub> or ZrO<sub>2</sub> in direct methanol production from unconventional syngas was experimentally investigated. The unconventional syngas used in this study contain 25% H<sub>2</sub>, 25% CO, 20% CH<sub>4</sub>, 20% CO<sub>2</sub> and 10% N<sub>2</sub>, representing biomass-derived syngas cultivated from an industrial wood chips pyrolysis plant. The catalysts were synthesised using co-precipitation technique and tested for methanol synthesis in a fixed-bed reactor. The activity test of the catalysts showed that the addition of CeO<sub>2</sub> or ZrO<sub>2</sub> to the CZA catalyst improved the methanol yield, albeit with lower selectivity, whereas adding MnO<sub>2</sub> enhanced methanol selectivity but decreased the methanol yield. ZrO<sub>2</sub>-promoted catalyst showed the best-improved activity and stability. The calcined and spent catalysts were characterised using X-ray diffraction (XRD), N<sub>2</sub> physisorption, N<sub>2</sub>O chemisorption, hydrogen temperature-programmed reduction (H<sub>2</sub>-TPR) and X-ray photoelectron spectroscopy (XPS). The characterisation results indicate that the catalytic activity is dependent on Cu dispersion, Cu-active surface area, the catalyst reducibility, Brunauer–Emmett–Teller (BET) surface area and the Cu<sup>0</sup>/Cu<sup>+</sup> ratio. In contrast, catalyst stability was related to the proportion of Cu<sup>+</sup> among all surface Cu species.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/apj.3121","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141649670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Correction of the cracking mechanism ratio in catalytic cracking process to characterize the thermal cracking reaction and realize highly sensitive identification of catalysts 修正催化裂化过程中的裂化机理比,以表征热裂化反应并实现催化剂的高灵敏度鉴定
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-14 DOI: 10.1002/apj.3123
Di Li, Xiaojun Dai, Baozhen Shi
{"title":"Correction of the cracking mechanism ratio in catalytic cracking process to characterize the thermal cracking reaction and realize highly sensitive identification of catalysts","authors":"Di Li,&nbsp;Xiaojun Dai,&nbsp;Baozhen Shi","doi":"10.1002/apj.3123","DOIUrl":"10.1002/apj.3123","url":null,"abstract":"<p>In this work, we have specially carried out the catalytic cracking experiments of heavy distillate oil in the high temperature range of 500~700°C. The composition of dry gas generated in the catalytic cracking process was analyzed, with emphasis on the variation of yield of C<sub>1</sub> and C<sub>2</sub> products. Two cracking mechanism ratios (CMRs) were redefined by replacing the (C<sub>1</sub> + C<sub>2</sub>) products in the traditional definition of CMR with CH<sub>4</sub>, and the feasibility of using them to characterize the thermal cracking reaction in the catalytic cracking process in the high temperature range was investigated. The results showed that CH<sub>4</sub> was more sensitive to temperature than (C<sub>1</sub> + C<sub>2</sub>) and it was feasible and more accurate to use CH<sub>4</sub> instead of (C<sub>1</sub> + C<sub>2</sub>) corrected R3 to characterize the thermal cracking reaction in the catalytic cracking process in the high temperature range. In addition, it was found that the corrected R3 had the effect of distinguishing and identifying catalysts.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141649671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel Au nanoparticles/ionic liquids/N- and P-co-doped carbon nanotubes-modified carbon cloth sensor for the sensitive detection of adrenaline 用于灵敏检测肾上腺素的新型金纳米粒子/离子液体/N-和 P-掺杂碳纳米管改性碳布传感器
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-07-09 DOI: 10.1002/apj.3120
Dan-Dan Cui, Xue-Ru Liu, Long-Yue Meng, Ying-ai Piao, Biao Jin
{"title":"A novel Au nanoparticles/ionic liquids/N- and P-co-doped carbon nanotubes-modified carbon cloth sensor for the sensitive detection of adrenaline","authors":"Dan-Dan Cui,&nbsp;Xue-Ru Liu,&nbsp;Long-Yue Meng,&nbsp;Ying-ai Piao,&nbsp;Biao Jin","doi":"10.1002/apj.3120","DOIUrl":"10.1002/apj.3120","url":null,"abstract":"<p>Adrenaline (AD) is important in information transmission through the human central nervous system. Considering the significant biochemical functions of AD, the development of electrochemical sensors capable of detecting AD levels in living organisms has attracted considerable interest. In this study, AD was detected using electrochemical sensors developed based on Au nanoparticles/ionic liquids/N- and P-co-doped carbon nanotubes-modified carbon cloth (AuNPs/ILs/N,P-MWCNTs/CC) electrodes. AuNPs/ILs/N,P-MWCNTs/CC composites were prepared on carbon cloth (CC) substrates using ionic liquids (ILs), N- and P-co-doped multi-walled carbon nanotubes (N,P-MWCNTs), and Au nanoparticles (AuNPs) as modified materials. The effects of pH and scanning speed were optimized and tested on the prepared composites. The results of cyclic voltammetry (CV) and differential pulse voltammetry (DPV) experiments showed that the modified ILs, N,P-MWCNTs, and AuNPs effectively improved the oxidation performance of AD. In addition, the linear range obtained from the DPV scans of the AuNPs/ILs/N,P-MWCNTs/CC composite material was 30–505 μmol/L, with a detection limit of 0.31 μmol/L. The fabricated sensors have good sensitivity (6.9 μA·mM<sup>−1</sup>·cm<sup>−2</sup>) for AD of 30–505 μM. Therefore, the electrochemical sensing method based on the AuNPs/ILs/N,P-MWCNTs/CC composite material is a promising and reliable AD detection technology that also exhibits good selectivity in the presence of interfering substances such as folic acid and ibuprofen. In practical applications, this material can help realize real-time AD detection to determine whether athletes use doping and other illegal drugs before competitions and to perform synchronous detection.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"19 5","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141567175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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