Catalysis Letters最新文献_第7页

Role of Acid Site Density and Pore Type on the Brønsted Acid Strength of Zeolite H-ZSM-5 酸位密度和孔型对H-ZSM-5沸石Brønsted酸强度的影响

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04991-0

Stefan Adrian F. Nastase, Luigi Cavallo

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Study on the Effect and Mechanism of Ru Precursors and Alkali Metal Modification on Ru/Pr6O11 Catalysts for Ammonia Decomposition Ru前驱体及碱金属改性对Ru/Pr6O11氨分解催化剂的影响及机理研究

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04992-z

Bin Guan, Junyan Chen, Zhongqi Zhuang, Lei Zhu, Zeren Ma, Xuehan Hu, Chenyu Zhu, Sikai Zhao, Kaiyou Shu, Hongtao Dang, Junjie Gao, Luyang Zhang, Tiankui Zhu, Zhen Huang

{"title":"Study on the Effect and Mechanism of Ru Precursors and Alkali Metal Modification on Ru/Pr6O11 Catalysts for Ammonia Decomposition","authors":"Bin Guan, Junyan Chen, Zhongqi Zhuang, Lei Zhu, Zeren Ma, Xuehan Hu, Chenyu Zhu, Sikai Zhao, Kaiyou Shu, Hongtao Dang, Junjie Gao, Luyang Zhang, Tiankui Zhu, Zhen Huang","doi":"10.1007/s10562-025-04992-z","DOIUrl":"10.1007/s10562-025-04992-z","url":null,"abstract":"<div><p>Facing with the problem of low activity at low temperatures of Ru-based ammonia decomposition catalyst, herein, the influence of Ru precursor and alkali metal modification on the hydrogen production activity of Ru/Pr<sub>6</sub>O<sub>11</sub> catalyst were studied. The Cs/Ru<sub>3</sub>(CO)<sub>12</sub>/Pr<sub>6</sub>O<sub>11</sub> catalyst exhibited the optimal activity (NH<sub>3</sub> conversion of 46.1% and H<sub>2</sub> production rate of 1.024 mmol·min<sup>−1</sup>·gcat<sup>−1</sup> at 350 °C). Characterizations showed that Ru<sub>3</sub>(CO)<sub>12</sub>/Pr<sub>6</sub>O<sub>11</sub> has the smallest Ru particle size and the most uniform size distribution, and the existence of PrO<sub>2</sub> phase in Ru(NO)(NO<sub>3</sub>)<sub>3</sub>/Pr<sub>6</sub>O<sub>11</sub> and Cl<sup>−</sup> groups in RuCl<sub>3</sub>/Pr<sub>6</sub>O<sub>11</sub> reduce the activity. Additionally, due to hydrogen spillover, SMSI and Ru re-distribution, the more alkaline alkali metal has a stronger promoting effect, which follows the law of volcanic curve. In-situ DRIFTS and DFT calculations showed that the rate determining step on Ru(0001) surface is the first dehydrogenation step of NH<sub>3</sub> with the activation barrier of 2.19 eV.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Modification of AgInS2/g-C3N4 Z-Scheme Heterojunction by Ag Nanoparticles to Increase Photocatalytic Rate Ag纳米粒子修饰AgInS2/g-C3N4 Z-Scheme异质结提高光催化速率

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04975-0

Yang Bai, Zhongxiang Chen, Deng Gu, Ren Wang, Jianing He

{"title":"Modification of AgInS2/g-C3N4 Z-Scheme Heterojunction by Ag Nanoparticles to Increase Photocatalytic Rate","authors":"Yang Bai, Zhongxiang Chen, Deng Gu, Ren Wang, Jianing He","doi":"10.1007/s10562-025-04975-0","DOIUrl":"10.1007/s10562-025-04975-0","url":null,"abstract":"<div><p>The Surface Plasmon Resonance (SPR) effect and the construction of Z-scheme heterojunctions are critical for enhancing photocatalytic rates. Herein, a composite material composed of a Z-scheme heterojunction structure, AgInS<sub>2</sub>/g-C<sub>3</sub>N<sub>4</sub> (AIS/GCN), was developed and further optimized through the modification of Ag nanoparticles (Ag NPs). The SPR effect of Ag NPs significantly improved the electron transfer characteristics of GCN, leading to enhanced separation efficiency of electron-hole pairs. By leveraging the advantages of the Z-scheme heterojunction, the composite not only effectively enhanced charge carrier separation but also improved light absorption and increased the density of active catalytic sites. To evaluate the photocatalytic degradation efficiency of Rhodamine B (RhB) and the photoreduction efficiency of Cr (VI) using the Ag/AIS/GCN nanocomposite, a systematic characterization analysis was conducted. The results demonstrated that the degradation rate and photoreduction efficiency of the Ag NPs-modified AIS/GCN Z-scheme heterojunction composite were 5.30 times and 7.22 times higher than those of pure GCN, the TOC removal rate of the sample reached 56.19%. The incorporation of Ag NPs and AIS significantly enhanced light energy utilization efficiency, increased the number of surface-active sites, and improved charge carrier transport rates. This study illustrates that the combination of the SPR effect and Z-scheme heterojunction construction markedly enhances the efficiency and stability of the photocatalyst, indicating the broad potential applications of this composite in dye purification and heavy metal removal.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Morphology-dependent Selectivity Switching of CeO2 in Tandem Conversion of Ethane and CO2 乙烷- CO2串联转化中CeO2的选择性开关

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04977-y

Guozhi Lei, Shengpeng Xia, Kun Zhao, Zengli Zhao, Anqing Zheng

{"title":"Morphology-dependent Selectivity Switching of CeO2 in Tandem Conversion of Ethane and CO2","authors":"Guozhi Lei, Shengpeng Xia, Kun Zhao, Zengli Zhao, Anqing Zheng","doi":"10.1007/s10562-025-04977-y","DOIUrl":"10.1007/s10562-025-04977-y","url":null,"abstract":"<div><p>The tandem conversion of C<sub>2</sub>H<sub>6</sub> and CO<sub>2</sub> provides an opportunity to utilize underused shale gas while reducing greenhouse gas emissions efficiently. Although desirable, this transformation poses considerable challenges, particularly in the realm of catalyst design either through CO<sub>2</sub>-assisted ethane dehydrogenation (CO<sub>2</sub>-EDH) to produce ethene or by dry reforming (DR) to produce syngas. Here, we found that the morphology of CeO<sub>2</sub> could determine which pathway was predominant. Transmission electron microscope (TEM) and X-ray photoelectron spectrometer (XPS) analyses of Pt and Sn showed that the spherical morphology of CeO<sub>2</sub> was more conducive to generating platinum-tin metal clusters than CeO<sub>2</sub> nanorod, illustrating the relatively high C<sub>2</sub>H<sub>4</sub> selectivity (93.50%) of the spherical structure. In contrast, the nanorod-shaped CeO<sub>2</sub> demonstrated enhanced activation of reactants and facilitated the reaction towards synthesis gas production, with a remarkable CO<sub>2</sub> conversion rate of 84%, which was much higher than previous works. Electron paramagnetic resonance (EPR) spectroscopy and XPS analysis of oxygen revealed that the nanorod-shaped CeO<sub>2</sub> had more oxygen vacancies, enhancing CO<sub>2</sub> adsorption capacity and promoting the dispersion of active species, which were crucial for efficient tandem catalytic reactions. These findings provide a promising approach to advancing catalyst design for efficient shale gas utilization in a carbon-negative manner.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Solid Acid Catalysts in Tert-Butyl Removal Reaction of 4,6-DBMC: Performance Insights and Industrial Implications 固体酸催化剂在4,6- dbmc脱叔丁基反应中的应用：性能观察和工业意义

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04985-y

Xiangke Wang, Xuan Meng, Li Shi, Naiwang Liu, Jiyu Wang

{"title":"Solid Acid Catalysts in Tert-Butyl Removal Reaction of 4,6-DBMC: Performance Insights and Industrial Implications","authors":"Xiangke Wang, Xuan Meng, Li Shi, Naiwang Liu, Jiyu Wang","doi":"10.1007/s10562-025-04985-y","DOIUrl":"10.1007/s10562-025-04985-y","url":null,"abstract":"<div><p>In the tert-butyl removal reaction, solid acid catalysts have emerged as a preferred alternative to liquid acid catalysts due to their environmentally friendly advantages. Various zeolites, such as ZSM-5, MCM-41, USY, and H beta, as well as mesoporous materials, such as γ-Al<sub>2</sub>O<sub>3</sub> and active clay were employed for the first time to prepare m-cresol through the tert-butyl removal reaction of 4,6-di-tert-butyl-m-cresol (4,6-DBMC). γ-Al<sub>2</sub>O<sub>3</sub> and active clay catalysts were found to have excellent catalytic performance in this reaction. The thermodynamic properties of the tert-butyl removal reaction of 4,6-DBMC were studied. Under different temperature and solvent conditions, the product distribution was investigated. A proposed reaction pathway and mechanism were proposed. And through cyclic experiments, the stability of γ-Al<sub>2</sub>O<sub>3</sub> and active clay catalysts was investigated separately. After six cycles, the m-cresol yield for active clay catalyst was still maintained at about 90%. The causes of deactivation of the two catalysts were analyzed. After regeneration, both catalysts exhibited good regeneration performance. This study offers a basis for the selection of solid acid catalysts for the tert-butyl groups removal of 4,6-DBMC. </p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Precursor Temperature on the Surface and Interface Structure of Ni/ZSM-5 Hydrogenation Catalyst 前驱体温度对Ni/ZSM-5加氢催化剂表面和界面结构的影响

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-05004-w

Guixian Li, Pengju Lei, Guang Chen, Xinhong Zhao, Zhibin Liu, Shoudeng Wang, Jichong Xia, Chengrong Kong, Dong Ji, Hongwei Li

{"title":"The Effect of Precursor Temperature on the Surface and Interface Structure of Ni/ZSM-5 Hydrogenation Catalyst","authors":"Guixian Li, Pengju Lei, Guang Chen, Xinhong Zhao, Zhibin Liu, Shoudeng Wang, Jichong Xia, Chengrong Kong, Dong Ji, Hongwei Li","doi":"10.1007/s10562-025-05004-w","DOIUrl":"10.1007/s10562-025-05004-w","url":null,"abstract":"<div><p>A series of Ni/ZSM-5 catalysts with different physical and chemical properties were prepared by immersion-precipitation method by adjusting the temperature of the precursor. The structure and properties of the catalyst were characterized by XRD, TEM, N<sub>2</sub> adsorption-desorption, H<sub>2</sub>-TPR, NH<sub>3</sub>-TPD and XPS. The influence of precursor temperature on the hydrogenation performance of m-dinitrobenzene was investigated, and the effects of reaction temperature and hydrogen pressure on the reaction were also examined, as well as the stability of the optimal catalyst. The results show that the particle size reduces gradually and the dispersion degree of Ni nanoparticles on ZSM-5 support becomes better as the precursor temperature is increased, which is conducive to improving the catalytic reaction rate. When the precursor temperature was 60 °C, the reaction temperature was 115 °C, the hydrogen pressure was 2.6 MPa, and a mixed solvent of ethanol and deionized water was employed. After 10 min of reaction, both the conversion rate of m-dinitrobenzene and the selectivity of m-phenylenediamine reached 100%. Under the same conditions, the conversion rate of m-dinitrobenzene was 44.73% and the selectivity of m-phenylenediamine was 9.83% after 60 min of reaction for Raney-Ni. The catalyst in this study not only saves solvent costs but also exhibits excellent catalytic performance in tests. After ten cycles of the catalyst, the conversion rate of m-dinitrobenzene was 100%, and the selectivity of m-phenylenediamine was 97.66%.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Copper(I) Supported on Fe3O4/Glycine Nanocomposite: A Sustainable Magnetic Nanocatalyst for Click Synthesis of 1,2,3-Triazoles in Water Fe3O4/甘氨酸纳米复合材料负载铜(I)：水中点击合成1,2,3-三唑的可持续磁性纳米催化剂

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04999-6

Noura Aflak, Hicham Ben El Ayouchia, Lahoucine Bahsis, Salah-Eddine Stiriba

{"title":"Copper(I) Supported on Fe3O4/Glycine Nanocomposite: A Sustainable Magnetic Nanocatalyst for Click Synthesis of 1,2,3-Triazoles in Water","authors":"Noura Aflak, Hicham Ben El Ayouchia, Lahoucine Bahsis, Salah-Eddine Stiriba","doi":"10.1007/s10562-025-04999-6","DOIUrl":"10.1007/s10562-025-04999-6","url":null,"abstract":"<div><p>In line with the principles of green chemistry, this study presents the development of a sustainable and efficient copper(I) catalyst supported on Fe<sub>3</sub>O<sub>4</sub>-amino acid glycine magnetic nanocomposites for the synthesis of 1,2,3-triazole derivatives <i>via</i> copper-catalyzed azide-alkyne cycloaddition (CuAAC) click chemistry reactions. The catalyst was synthesized using a simple method and then characterized using multiple techniques, including XRD, FT-IR, SEM, EDX, TGA, and AAS, confirming its successful synthesis. Moreover, the catalytic system showed good catalytic activity for the selective synthesis of 1,4-disubstituted-1,2,3-triazoles, giving good to high yields under mild conditions with low catalyst loading. The environmental friendliness of the process was evaluated using atom economy (AE), E-factor, and EcoScale indicating a good level of sustainability. Furthermore, the Fe<sub>3</sub>O<sub>4</sub>-glycine/Cu(I) composite could be separated magnetically and reused over multiple cycles. The green advantages of this method are highlighted using water as a solvent, room-temperature reactions, and the easy separation of both final products and catalyst, which confirm the sustainability of this catalytic approach. </p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pickering Assisted Catalysis for Selective Synthesis of Benzalacetones 皮克林辅助催化选择性合成苯甲丙酮

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04984-z

Mohd Hasnain Sayed, Bhalchandra M. Bhanage, Radha V. Jayaram

{"title":"Pickering Assisted Catalysis for Selective Synthesis of Benzalacetones","authors":"Mohd Hasnain Sayed, Bhalchandra M. Bhanage, Radha V. Jayaram","doi":"10.1007/s10562-025-04984-z","DOIUrl":"10.1007/s10562-025-04984-z","url":null,"abstract":"<div><p>Pickering emulsions belong to the class of dispersion systems of two immiscible liquids stabilized by solid particles. The stability of such emulsions is affected by several parameters such as the method of emulsification, oil–water ratio, size, shape and amount of solid particles. In this study, rod-shaped MgO particles were prepared and characterized by XRD, FE-SEM, HR-TEM, DLS and CO<sub>2</sub>-TPD techniques. The as-prepared MgO particles were utilized in the Pickering-assisted catalytic system for the condensation of acetone with benzaldehyde and its derivatives. The compartmentalization of benzalacetone within oil droplets prevented further condensation resulting in high selectivity. The effect of the amount of MgO particles and various oil phases on the catalytic activity was studied. The synthetic utility of the system is demonstrated for gram-scale synthesis. The MgO-stabilized Pickering emulsion catalytic system was found to be reusable for at least five reaction cycles without any considerable loss in catalytic activity.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Green Synthesis of Isosorbide from Sorbitol with Dimethyl Carbonate Catalyzed by Sodium Acetate Under Mild Condition 温和条件下醋酸钠催化碳酸二甲酯与山梨糖醇绿色合成异山梨酯

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04997-8

Lan Zhou, Zhuxin Bao, Yanli Pi, Qiuling Shi, Shihao Nan, Zhiling Xiang, Tao Shi, Saimeng Jin, Weifeng Shen

{"title":"Green Synthesis of Isosorbide from Sorbitol with Dimethyl Carbonate Catalyzed by Sodium Acetate Under Mild Condition","authors":"Lan Zhou, Zhuxin Bao, Yanli Pi, Qiuling Shi, Shihao Nan, Zhiling Xiang, Tao Shi, Saimeng Jin, Weifeng Shen","doi":"10.1007/s10562-025-04997-8","DOIUrl":"10.1007/s10562-025-04997-8","url":null,"abstract":"<div><p>The environmental challenges associated with the dehydration of sorbitol to isosorbide using strong acid catalysts have prompted the development of cleaner and milder reaction pathway. The dehydration of sorbitol <i>via</i> dimethyl carbonate (DMC) in the presence of a catalytic amount of base is a reliable and environmentally friendly process for the industrial production of isosorbide. Herein, isosorbide is cleanly synthesized from sorbitol with DMC catalyzed by green catalyst sodium acetate under moderate condition. The optimal transformation conditions of sorbitol to isosorbide through DMC are determined to be a molar ratio of sorbitol to DMC = 1:16 and sodium acetate/sorbitol mass ratio = 3:20 reacting at 90 °C for 24 h with approximately 60% yield of isosorbide attained. The proposed synthesis process of isosorbide in this research is less hazardous and more environmental-friendly in compared to traditional synthesis processes, and broadens the range of catalysts used in the DMC based isosorbide production.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of K-Cr@alumina Catalysts for Isobutane Dehydrogenation and Membrane Reactor Applications K-Cr@alumina异丁烷脱氢催化剂的合成及膜反应器应用

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-04-04 DOI: 10.1007/s10562-025-04990-1

Meltem Dogan, Hatice Kara Acat, Saliha Cetinyokus

{"title":"Synthesis of K-Cr@alumina Catalysts for Isobutane Dehydrogenation and Membrane Reactor Applications","authors":"Meltem Dogan, Hatice Kara Acat, Saliha Cetinyokus","doi":"10.1007/s10562-025-04990-1","DOIUrl":"10.1007/s10562-025-04990-1","url":null,"abstract":"<div><p>In this study, it was aimed to enrich the feed stream in the FCC (Fluid Catalytic Cracking) unit outlet by isobutane dehydrogenation. A gas mixture consisting of 15 mol% isobutane, 15 mol% isobutene, 15 mol% hydrogen, and 55 mol% helium was used as the feed stream. Reactions were performed in a fixed bed reactor system containing a Pd alloy membrane by creating a pressure difference of 70 kPa between the two sides of the membrane at 550 °C and 600 °C. Catalysts containing 8% Cr by mass and a Cr/K ratio of three were prepared by impregnation technique using alumina supports. The highest amount of monochromate was determined in the catalyst where K was loaded onto the support first. It is known that the most active form for dehydrogenation reactions in chromium-based catalysts is monochromate. It was shown that monochromatic structures were increased by adding potassium. The equilibrium conversions were exceeded at both temperatures. In the catalytic tests carried out at WHSV (Weight Hourly Space Velocity) values corresponding to two different retention times (0.3 h<sup>−1</sup> and 0.5 h<sup>−1</sup>), lower isobutene yield values were obtained when the retention time was increased. The amount of monochromate in the catalyst structure was preserved with the help of water formed during the reaction. The decrease in isobutene yield values during the reaction was explained by isobutene decomposition and coke formation. It was also shown that the excess hydrogen in the medium caused the hydrogenation of propane as well as isobutane hydrogenation.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 5","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0