Asia-Pacific Journal of Chemical Engineering最新文献

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A Numerical Simulation Study on Condensation Heat Transfer Performance of Serrated Spiral-Finned Tube 锯齿形螺旋翅片管冷凝传热性能的数值模拟研究
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-19 DOI: 10.1002/apj.3186
Kelang Jin, Xiang Liu, Lei Zhang, Xue Xue, Hao Zhou
{"title":"A Numerical Simulation Study on Condensation Heat Transfer Performance of Serrated Spiral-Finned Tube","authors":"Kelang Jin,&nbsp;Xiang Liu,&nbsp;Lei Zhang,&nbsp;Xue Xue,&nbsp;Hao Zhou","doi":"10.1002/apj.3186","DOIUrl":"https://doi.org/10.1002/apj.3186","url":null,"abstract":"<div>\u0000 \u0000 <p>Serrated spiral-finned tubes have been extensively applied in heat exchangers, but the main research on them is about sensible heat transfer processes and only a few studies focus on condensation behavior. In this research, a model of mass and heat transfer about condensation of water vapor on the outside tube surfaces is developed by Fluent combined with a user-defined function. The effects of different finned tube geometrical parameters are investigated. The model's reliability is verified by experiments on smooth tubes. The model is applied to finned tubes with different structures. A simple evaluation index \u0000<span></span><math>\u0000 <mfenced>\u0000 <mrow>\u0000 <msub>\u0000 <mi>q</mi>\u0000 <mi>ln</mi>\u0000 </msub>\u0000 <mo>·</mo>\u0000 <mi>j</mi>\u0000 </mrow>\u0000 </mfenced>\u0000 <mo>/</mo>\u0000 <mi>f</mi></math> about the dimensionless condensation rate \u0000<span></span><math>\u0000 <msub>\u0000 <mi>q</mi>\u0000 <mi>ln</mi>\u0000 </msub></math>, the dimensionless heat transfer factor <i>j</i>, and the resistance factor <i>f</i> is used to assess the comprehensive heat transfer performance of these finned tubes. The simulation results reflect that the increase of the base tube's outer diameter could enhance the comprehensive heat transfer performance, whereas the increase of the height and width of the open tooth will weaken the comprehensive condensation heat transfer performance to a different degree. Finally, the correlation equations of Nu, Eu, and dimensionless condensation rate \u0000<span></span><math>\u0000 <msub>\u0000 <mi>q</mi>\u0000 <mi>ln</mi>\u0000 </msub></math> with wet air flow rate, water vapor content, base tube's outer diameter, and height and width of the open tooth are fitted, the deviations of Nu are not more than 5%, and the relative deviations of \u0000<span></span><math>\u0000 <msub>\u0000 <mi>q</mi>\u0000 <mi>ln</mi>\u0000 </msub></math> and Eu could satisfy that 93% of the data is within 30%. Then, the finned tube geometry with optimal integrated condensation heat transfer performance (\u0000<span></span><math>\u0000 <msub>\u0000 <mi>d</mi>\u0000 <mi>o</mi>\u0000 </msub></math> = 23 mm, \u0000<span></span><math>\u0000 <msub>\u0000 <mi>h</mi>\u0000 <mn>2</mn>\u0000 </msub></math> = 6 mm, <i>w</i> = 2.97 mm) is obtained.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197621","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
Sulfur Removal From Low-Grade Turkish Kaolin Clay 低品位土耳其高岭土除硫研究
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-19 DOI: 10.1002/apj.3185
Ilker Erkan, Ibrahim Alp
{"title":"Sulfur Removal From Low-Grade Turkish Kaolin Clay","authors":"Ilker Erkan,&nbsp;Ibrahim Alp","doi":"10.1002/apj.3185","DOIUrl":"https://doi.org/10.1002/apj.3185","url":null,"abstract":"<div>\u0000 \u0000 <p>This study investigated the effects of NaOH direct leaching for sulfur removal from a kaolin ore from the Balıkesir region, Turkey. Characterization studies were undertaken before sulfur removal studies to enlighten the structure and originate the source of sulfur. The characterization studies revealed that the ore was mainly composed of quartz, with sulfur originating from alunite minerals with opal inclusions. The leaching process was tested under varying NaOH concentrations (1.5–2 M), temperatures (95 ± 2°C), and durations (2 h) in temperature-controlled closed systems to maintain consistency. Results demonstrated complete (100%) sulfur removal from alunite under optimal conditions. However, significant mass losses (18.15%–45%) occurred because of the dissolution of kaolinite along with alunite, indicating the method's effectiveness in sulfur removal but also its potential drawbacks for kaolinite retention.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197620","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
Optimization of Liquid-Cooled Thermal Management System Based on Cylindrical Battery Packs: A Novel Wedge Applied to the Cooling Channel 基于圆柱形电池组的液冷热管理系统优化:一种应用于冷却通道的新型楔体
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-19 DOI: 10.1002/apj.3184
Zonghui Ran, Baozhan Lv, Yuanyuan Ren, Tianliang Wu, Jiawei Fang
{"title":"Optimization of Liquid-Cooled Thermal Management System Based on Cylindrical Battery Packs: A Novel Wedge Applied to the Cooling Channel","authors":"Zonghui Ran,&nbsp;Baozhan Lv,&nbsp;Yuanyuan Ren,&nbsp;Tianliang Wu,&nbsp;Jiawei Fang","doi":"10.1002/apj.3184","DOIUrl":"https://doi.org/10.1002/apj.3184","url":null,"abstract":"<div>\u0000 \u0000 <p>In the field of new energy vehicles, battery liquid cooling systems are widely adopted due to their convenient packaging and high cooling efficiency. To address the challenge of relatively poor temperature uniformity in liquid cooling systems, this research introduces a novel wedge structure to enhance system cooling performance and temperature consistency. Firstly, six innovative wedge structures were proposed and comprehensively evaluated based on their heat transfer characteristics. Secondly, the impact of the structural parameters of the selected wedge design on the system's heat dissipation was investigated. Finally, optimizations were conducted on various factors, including arrangement schemes, number of passages, and inlet and outlet directions. The results indicate that the wedge structure disrupts the flow state of the cooling medium, promotes increased coolant flow within the channel, and enhances the heat dissipation of the module. The newly implemented structure can maintain the average module temperature at 32.59°C. By merely arranging the wedges alternately in a single channel, the maximum module temperature can be reduced to 32.41°C, and the temperature difference can be narrowed to 4.52°C, representing a decrease of 2.82°C in maximum temperature and 1.95°C in temperature difference compared with a smooth channel. This proves that the new wedges exhibit exceptional performance in heat dissipation and temperature uniformity. Furthermore, by upgrading the single liquid-cooled module to a double liquid-cooled module with full alternating flow, the temperature difference can ultimately be controlled to 4°C, and the maximum temperature is reduced to 29.84°C.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197619","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 Mutual Information Based Multifeature Pattern Recognition Criterion for Identification and Optimization of Thermally Safe Operating Conditions for Single Diffusion-Controlled Reactions Occurring in Isoperibolic Liquid–Liquid Semibatch Reactors 一种基于互信息的多特征模式识别准则,用于等循环液-液半间歇反应器中单扩散控制反应的热安全操作条件辨识与优化
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-13 DOI: 10.1002/apj.3190
Qiuyu Wang, Guang Yang, Jiaxing Zhu, Tianshuo Zheng, Bingbing Su, Bo Zhang
{"title":"A Mutual Information Based Multifeature Pattern Recognition Criterion for Identification and Optimization of Thermally Safe Operating Conditions for Single Diffusion-Controlled Reactions Occurring in Isoperibolic Liquid–Liquid Semibatch Reactors","authors":"Qiuyu Wang,&nbsp;Guang Yang,&nbsp;Jiaxing Zhu,&nbsp;Tianshuo Zheng,&nbsp;Bingbing Su,&nbsp;Bo Zhang","doi":"10.1002/apj.3190","DOIUrl":"https://doi.org/10.1002/apj.3190","url":null,"abstract":"<div>\u0000 \u0000 <p>Prevention of thermal runaway and establishment of safe-economic operating conditions are crucial for the practical operation of single diffusion-controlled liquid–liquid reactions occurring in isoperibolic semibatch reactors. Hence, in this study, a mutual information-based multiple feature recognition criterion (MI-MFR) was innovatively proposed, for which the maximum relevance minimum redundancy approach was introduced in feature screening; in combination with the support vector machine algorithm, various thermal behaviors can be effectively recognized. On this basis, a series of boundary diagrams were established accordingly, the impact of the variation in model parameters on which was systematically explored. Subsequently, an improved generalized thermal safety region was developed by introducing the upper thresholds in normal and cooling failure scenarios. Meanwhile, the robustness and progressiveness of the established MI-MFR criterion were confirmed by comparison with other conventional criteria. Finally, MI-MFR-based procedures were constructed to identify thermal behaviors and optimize safe-economic operating conditions in practices, based on which the optimum operating conditions of toluene mononitration were obtained.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197243","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 Desorption Mechanism of Sulfur Dioxide–Modified Activated Carbon Based on Density Functional Theory 基于密度泛函理论的二氧化硫改性活性炭解吸机理研究
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-13 DOI: 10.1002/apj.3189
Cong Chen, Rui Wang, Xiaoshuo Liu, Yufeng Duan, Weidong Shi, Huatong Cai, Guofeng Fang, Linpeng Yan, Zhenxiong Wang
{"title":"Study on the Desorption Mechanism of Sulfur Dioxide–Modified Activated Carbon Based on Density Functional Theory","authors":"Cong Chen,&nbsp;Rui Wang,&nbsp;Xiaoshuo Liu,&nbsp;Yufeng Duan,&nbsp;Weidong Shi,&nbsp;Huatong Cai,&nbsp;Guofeng Fang,&nbsp;Linpeng Yan,&nbsp;Zhenxiong Wang","doi":"10.1002/apj.3189","DOIUrl":"https://doi.org/10.1002/apj.3189","url":null,"abstract":"<div>\u0000 \u0000 <p>Activated carbon injection technology is the primary method used to control the mercury emissions from coal-fired power plants. The preparation of sulfur-loaded carbon-based adsorbents through SO<sub>2</sub> modification of the surface of activated carbon (the primary component) provides an effective solution to enhancing the mercury removal performance of adsorbents. However, there remains a lack of clarity on the adsorption performance and mechanism of mercury on the newly formed active sites of the carbon surface after SO<sub>2</sub> sulfur loading modification. In this study, four potential structures of SO<sub>2</sub> loaded onto the surface of activated carbon were constructed. Quantum chemical calculation methods were applied to calculate the adsorption process of Hg in these four models, with those important characteristics identified such as bonding properties, adsorption energy, electrostatic potential, and molecular orbitals. As indicated by those results, the adsorption bonds of the SO<sub>2</sub>-modified activated carbon were mainly C-O-S and C-S-C. After the carbon cluster model adsorbed SO<sub>2</sub> molecules, the sulfur in SO<sub>2</sub> exhibited a strong positive potential that facilitated the loss of electrons from Hg due to the potential difference. Consequently, HgO was firmly adsorbed onto the surface of the carbon cluster. As revealed by the molecular orbital calculations performed after Hg adsorption on the two carbon cluster models, SO<sub>2</sub>-modified and elemental sulfur-modified activated carbons, in the SOAC-Arm-1 configuration, there was a clear exchange orbital around the adsorbed Hg atom in the LUMO, with a small HOMO–LUMO energy gap of only 0.01713 eV. At this point, the free electrons on the molecule were prone to orbital transitions, promoting the occurrence of adsorption reactions. The SOAC-Arm-3 conformation exhibited the shortest C-Hg bond length and had an adsorption energy of up to −70.42 kJ/mol, indicating a stronger chemical bonding ability and a higher likelihood of adsorption reactions. These results demonstrate the feasibility of sulfur-loaded modified activated carbon to mitigate Hg pollution through SO<sub>2</sub>.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197241","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
Investigation of the Products and the Migration of Sodium and Chlorine During Pyrolysis of High-Sodium Coal Mixed With Phosphorite 高钠煤与磷矿混合热解产物及钠、氯迁移的研究
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-10 DOI: 10.1002/apj.3183
Zhihua Tian, Qinhui Wang
{"title":"Investigation of the Products and the Migration of Sodium and Chlorine During Pyrolysis of High-Sodium Coal Mixed With Phosphorite","authors":"Zhihua Tian,&nbsp;Qinhui Wang","doi":"10.1002/apj.3183","DOIUrl":"https://doi.org/10.1002/apj.3183","url":null,"abstract":"<div>\u0000 \u0000 <p>The impact of adding phosphorite during the pyrolysis of high-sodium Shaerhu coal to address severe deposition and corrosion issues caused by the release of volatile sodium and chlorine compounds was explored. During pyrolysis, sodium compounds volatilize and condense on cooler surfaces, leading to deposits that corrode metal and reduce boiler efficiency. By copyrolyzing phosphorite with coal, the study finds that tar yield decreases, whereas char yield increases, with slightly improved char reactivity. The pyrolysis gas yield also increases, with higher concentrations of methane and hydrogen, enhancing energy utilization. Calcium compounds in phosphorite react with sodium chloride and sodium sulfate, forming high-melting-point, insoluble sodium compounds and water-soluble chlorides, thereby reducing the release of sodium and chlorine. This reduces fouling and corrosion, improving equipment efficiency. Additionally, recycling copyrolyzed phosphorite for yellow phosphorus production can enhance conversion ratios, supporting the production of higher-value phosphorus chemicals.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197251","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
An Improved Permeation Model for Solution–Diffusion-Based Hollow Fiber Gas Separation Membrane: Implementation and Analysis 一种改进的溶液扩散中空纤维气体分离膜渗透模型:实现与分析
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-05 DOI: 10.1002/apj.3182
Rama Alqassar Bani Almarjeh, Jason Yi Juang Yeo, Yomen Atassi, Seyed Saeid Hosseini, Jaka Sunarso
{"title":"An Improved Permeation Model for Solution–Diffusion-Based Hollow Fiber Gas Separation Membrane: Implementation and Analysis","authors":"Rama Alqassar Bani Almarjeh,&nbsp;Jason Yi Juang Yeo,&nbsp;Yomen Atassi,&nbsp;Seyed Saeid Hosseini,&nbsp;Jaka Sunarso","doi":"10.1002/apj.3182","DOIUrl":"https://doi.org/10.1002/apj.3182","url":null,"abstract":"<div>\u0000 \u0000 <p>Dense polymeric hollow fiber membrane–based gas separation modules are becoming increasingly important in various industrial fields due to their higher efficiency compared to other gas separation processes. Modeling the membranes gas separation process and analyzing the governing mathematical equations such as the solution–diffusion model are crucial for optimizing module performance and making the process cost-effective. Herein, we introduce an improved methodology for solving the mathematical model of polymeric hollow fiber gas separation membranes focusing on a simpler and more accurate solution strategy. Unlike previous solving methods, the model characteristic functions (feed flow, permeate flow, feed composition, permeate composition within the porous support layer, and bulk permeate composition) better adhere to boundary conditions at the module inlet and closed-end. The improved solving algorithm provides a more accurate solution, with a maximum mean squared error of 7.3441 × 10<sup>−5</sup> and minimum \u0000<span></span><math>\u0000 <msup>\u0000 <mi>R</mi>\u0000 <mn>2</mn>\u0000 </msup></math> of 0.8853, outperforming previous complex methods. The corrected algorithm also features improved speed, completing calculations in under 0.015 s, faster than any reported values. The model's response to changes in geometric and operating conditions is evaluated through an extensive sensitivity test, which is conducted by statistical analysis and numerical solutions. Numerical solution approach allows for a wider range of possibilities of interactions compared to statistical analysis and enables inspection of a wider response surface. Additionally, the response equation is estimated for permeate purity, stagecut, and retentate purity, and the process is optimized for different goals. Performance of membrane gas separation is highly sensitive to the membrane sizing and feed concentration, as these factors significantly influence the separation driving force. Therefore, this study presents an improved solving strategy and a detailed description of the effect of various parameters on the model response, along with a comprehensive comparison to statistical analysis and process optimization possibilities.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197412","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
Characterization of Particle Fluidization in a New Type of Fluidized Bed Flotation Unit 新型流化床浮选装置颗粒流化特性研究
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-02 DOI: 10.1002/apj.3180
Zhenlong Zhao, Zhiyuan Li
{"title":"Characterization of Particle Fluidization in a New Type of Fluidized Bed Flotation Unit","authors":"Zhenlong Zhao,&nbsp;Zhiyuan Li","doi":"10.1002/apj.3180","DOIUrl":"https://doi.org/10.1002/apj.3180","url":null,"abstract":"<div>\u0000 \u0000 <p>Understanding the hydrodynamics of the bed layer in a fluidized bed is essential for optimizing and improving fluidized bed flotation units. This study proposes a fluidized bed flotation column that incorporates auxiliary particles into the gas–liquid two-phase system to address the shortcomings of traditional flotation units. Stainless steel particles (glass beads), tap water, and compressed air were used as the solid, liquid, and gas phases, respectively. Key factors affecting the bed hydrodynamics (such as bed fluctuation, minimum fluidization velocity, bed expansion, and porosity) in the fluidized column include gas and liquid flow rates as well as the initial bed height. Experimental results show that selecting appropriate filling particles can effectively enhance the fluidization performance of the bed, while appropriately increasing the gas flow rate can achieve fluidization at lower liquid velocities, thus reducing energy consumption during the flotation mineralization process. Theoretical analysis combined with extensive data reveals that the expansion characteristics of the fluidized bed and the use of high-density filling particles can effectively mitigate bed layer fluctuations and stabilize the flow field environment. Additionally, based on a wide range of data, this study employs model factor analysis, dimensionless analysis, and multiple linear regression analysis to propose a standard dimensionless parameter model for the fluidized bed flotation column, which can effectively predict bed layer fluctuations and expansion characteristics.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197357","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
Cu–Zn Catalysts Derived From ZIF-8 Applied in Ethynylation of Formaldehyde for 1,4-Butynediol Synthesis: The Positive Effect of Carbon Layers ZIF-8衍生Cu-Zn催化剂在甲醛乙基化合成1,4-丁酮二醇中的应用:碳层的积极作用
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-12-02 DOI: 10.1002/apj.3181
Guihua Yang, Jiali Chen, Linxue Yang, Rui Wang
{"title":"Cu–Zn Catalysts Derived From ZIF-8 Applied in Ethynylation of Formaldehyde for 1,4-Butynediol Synthesis: The Positive Effect of Carbon Layers","authors":"Guihua Yang,&nbsp;Jiali Chen,&nbsp;Linxue Yang,&nbsp;Rui Wang","doi":"10.1002/apj.3181","DOIUrl":"https://doi.org/10.1002/apj.3181","url":null,"abstract":"<div>\u0000 \u0000 <p>Cu-based catalysts applied in ethynylation reaction of formaldehyde for 1,4-butynediol synthesis has been widely concerned. The activity and stability of Cu-based catalyst is still a challenging task in this field. Here, Cu–Zn catalysts derived from ZIF-8 are prepared by a coprecipitation method and applied in ethynylation reaction of formaldehyde. All catalysts were characterized through thermogravimetric, x-ray diffraction, N<sub>2</sub> physical adsorption–desorption, transmission electron microscopy, H<sub>2</sub>-temperture-programmed reduction, x-ray photoelectron spectroscopy, and Raman and Fourier transform infrared analysis. The effect of calcination temperature of ZIF-8 on the catalyst structures and ethynylation performances are all investigated. The results show that CuO<sub>5h</sub>-ZnO<sub>400</sub> catalyst has the best catalytic activity, with a formaldehyde conversion of 98% and 1,4-butynediol selectivity of 100%. It is mainly due to the presence of highly dispersed and small particle CuO. Moreover, CuO<sub>3h</sub>-ZnO<sub>400</sub> catalyst prepared by optimized conditions can further improve the stability in ethynylation reaction due to more carbon species on the surface of ZnO. The more carbon contents in Cu–Zn catalyst contribute to the ethynylation activity and stability due to the interaction between Cu and C species favoring Cu<sub>2</sub>C<sub>2</sub> formed. In addition, the ethynylation reaction mechanism catalyzed by Cu–Zn catalyst is illustrated carefully. The Cu–Zn catalysts derived from ZIF-8 can provide some ideas for the application in ethynylation reaction of formaldehyde for 1,4-butynediol synthesis.</p>\u0000 </div>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 3","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144197358","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
Localized corrosion behavior on a heterogeneous surface involving multicomponent reactive transport and morphology evolution 非均质表面的局部腐蚀行为涉及多组分反应输运和形态演化
IF 1.4 4区 工程技术
Asia-Pacific Journal of Chemical Engineering Pub Date : 2024-11-11 DOI: 10.1002/apj.3176
Jukai Chen, Xiaodan Wang, Ruidong Li, Yueshe Wang, Haisheng Li, Yinghua Chen
{"title":"Localized corrosion behavior on a heterogeneous surface involving multicomponent reactive transport and morphology evolution","authors":"Jukai Chen,&nbsp;Xiaodan Wang,&nbsp;Ruidong Li,&nbsp;Yueshe Wang,&nbsp;Haisheng Li,&nbsp;Yinghua Chen","doi":"10.1002/apj.3176","DOIUrl":"https://doi.org/10.1002/apj.3176","url":null,"abstract":"<p>Localized corrosion sometimes brings about unanticipated and catastrophic damages in petrochemical pipelines and pressure vessels. For localized corrosion modeling, multicomponent reactive transport and corrosion morphology evolution are two arduous problems that involve multi–physical-(electro) chemical processes along with multi–temporal and spatial scales. In this study, the lattice Boltzmann method (LBM) is employed to shed some light on the evolution of localized corrosion on a heterogeneous surface focusing on the effects of electrolyte ohmic resistance and diffusion. The corrosion pit is always initiated at the junction of anode and cathode sites; however, quite different morphologies are prompted under ohmic control or ohmic-diffusion control. Under ohmic control, the pit propagates along the interface of the anode and cathode. Under ohmic-diffusion control, the pathway of reactive species is broadened, and the corrosion morphology is developed into a more regular shape, like a flattened semicircle in 2-D modeling. This work presents the huge potential of LBM in long-term corrosion modeling.</p>","PeriodicalId":49237,"journal":{"name":"Asia-Pacific Journal of Chemical Engineering","volume":"20 2","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801465","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
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