Catalysis Letters最新文献_第7页

Synthesis of Methyl-Oleate from Methyl 12-Hydroxystearate Using Modified Vanadia Pillared Clay 改性钒基柱撑粘土催化12-羟基硬脂酸甲酯合成油酸甲酯

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-06 DOI: 10.1007/s10562-025-05134-1

Nikita Chendwankar, Nishamol Kanat, Subhash Udeshi

{"title":"Synthesis of Methyl-Oleate from Methyl 12-Hydroxystearate Using Modified Vanadia Pillared Clay","authors":"Nikita Chendwankar, Nishamol Kanat, Subhash Udeshi","doi":"10.1007/s10562-025-05134-1","DOIUrl":"10.1007/s10562-025-05134-1","url":null,"abstract":"<div><p>This study investigates the synthesis of vanadia-pillared clay (V-PILC) and nickel-doped vanadia-pillared clays (Ni-V-PILCs) as catalysts for the dehydration of methyl-12-hydroxy stearate, aiming to produce methyl oleate predominantly. The catalysts were synthesized using the pillaring method and were doped with varying concentrations of nickel (2.5–12.5 wt%). Characterization techniques employed included X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, pore structure assessment, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and ammonia temperature-programmed desorption (NH₃-TPD) to evaluate their properties. Catalytic activity tests revealed that while the V-PILC demonstrated a slightly higher conversion rate (99.93%) compared to the Ni-V-PILCs (97–99%), the nickel-doped variants exhibited superior product yields (84.98% vs. 74.11%). These vanadia-pillared clay catalysts, along with their nickel-doped counterparts, show high catalytic efficiency, reduce the number of derivatization steps, and offer an environmentally sustainable alternative for producing methyl oleate.</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 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162762","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

Engineered Nitrilase-Mediated Regioselective Hydrolysis of 4-Cyanobenzonitrile for Efficient Synthesis of 4-Cyanobenzoic Acid 工程腈酶介导的4-三苯腈区域选择性水解高效合成4-三苯甲酸

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-06 DOI: 10.1007/s10562-025-05130-5

Yan Wu, Feng Du, Ning Li, Wen Zheng, Mimi Duan, Min Cao, Suling Zheng, Leichi Dong, Muqing Ma, Zhibo Luo

{"title":"Engineered Nitrilase-Mediated Regioselective Hydrolysis of 4-Cyanobenzonitrile for Efficient Synthesis of 4-Cyanobenzoic Acid","authors":"Yan Wu, Feng Du, Ning Li, Wen Zheng, Mimi Duan, Min Cao, Suling Zheng, Leichi Dong, Muqing Ma, Zhibo Luo","doi":"10.1007/s10562-025-05130-5","DOIUrl":"10.1007/s10562-025-05130-5","url":null,"abstract":"<div><p>As a pivotal synthetic intermediate for pharmaceuticals, agrochemicals, and advanced materials, 4-cyanobenzonitrile has garnered significant interest. However, conventional chemical approaches face inherent limitations in achieving regioselective hydrolysis of its symmetrical cyano groups to produce 4-cyanobenzoic acid, primarily due to harsh reaction conditions and poor selectivity. We predicted the kinetic parameters (<i>k</i><sub>cat</sub> value) of 30 nitrilases from different sources by machine learning model and five nitrilases were chosen for further researches. Subsequently, to address this challenge, we heterologously expressed and characterized two nitrilases—NIT-3 from <i>Fusarium fujikuroi</i> IMI 58289 and NIT-4 from <i>Paraburkholderia graminis</i>—for biocatalytic hydrolysis under industrially relevant high substrate loading. Remarkably, in a 100-L bioreactor system, both enzymes demonstrated exceptional catalytic efficiency, utilizing 7.50 g/L (DCW, dry cell weight) whole-cell biocatalysts to completely hydrolyze 120 g/L 4-cyanobenzonitrile within 8 h, achieving > 99% conversion and 100% regioselectivity toward 4-cyanobenzoic acid. The robust substrate tolerance, operational stability, and scalability of these nitrilases underscore their potential for sustainable industrial synthesis of high-value aromatic carboxylic acids.</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 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162233","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

Photocatalytic Hydrogen Production Performance of Ag-modified S-scheme CdS/Bi2O3 Heterojunction Composites ag修饰S-scheme CdS/Bi2O3异质结复合材料的光催化制氢性能

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-05 DOI: 10.1007/s10562-025-05132-3

Guangling Zuo, Hongyong Ye, Yiheng Fang, Jia Du, Xin Ding

{"title":"Photocatalytic Hydrogen Production Performance of Ag-modified S-scheme CdS/Bi2O3 Heterojunction Composites","authors":"Guangling Zuo, Hongyong Ye, Yiheng Fang, Jia Du, Xin Ding","doi":"10.1007/s10562-025-05132-3","DOIUrl":"10.1007/s10562-025-05132-3","url":null,"abstract":"<div><p>This study successfully synthesizes an Ag-modified CdS/Bi<sub>2</sub>O<sub>3</sub> (Ag-CS/BO) S-scheme heterojunction photocatalyst via a solvothermal approach coupled with a photoreduction technique. The research examines the photocatalytic hydrogen evolution performance of this Ag-modified catalyst in water splitting reactions and the underlying catalytic mechanism. The findings indicate that the S-scheme heterojunction formed by hexagonal Bi<sub>2</sub>O<sub>3</sub> (BO) nanosheets and CdS (CS) nanoparticles can selectively recombine the conduction band electrons of BO with the valence band holes of CS via the effect of the interfacial internal electric field (IEF). Meanwhile, this photocatalyst retains the strongly reductive electrons (-0.53 eV vs. NHE) in the conduction band of CS and the highly oxidative holes (+ 2.76 eV vs. NHE) in the valence band of BO. The incorporation of silver nanoparticles further expands the light absorption spectrum and facilitates charge separation via the surface plasmon resonance (SPR) effect. The 3-Ag-CS/BO composite with 3 wt% silver doping demonstrates a hydrogen evolution rate of 1276.8 µmol·g<sup>− 1</sup>·h<sup>− 1</sup> under simulated solar irradiation, showing a 4.4-fold increase compared to pristine BO. Additionally, this newly synthesized catalyst exhibits remarkable cycling stability. The combination of X-ray photoelectron spectrometer (XPS), Mott-Schottky measurements, and first-principles calculations all confirm the electron transfer pathway from CS to BO and reveal the unique charge separation mechanism of the S-scheme heterojunction. This study offers novel perspectives for the design of high-efficiency S-scheme heterojunction photocatalysts.</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 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162044","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

Nickel-Induced Promotion Over Hydrogenation Catalysts: Insights from Model Porphyrin Deposition in the Absence of Vanadium Effects 镍诱导的加氢催化剂上的促进作用：在没有钒效应的情况下卟啉沉积模型的见解

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-05 DOI: 10.1007/s10562-025-05121-6

Yuhao Du, Dawei Hu, Zhen Wang, Anpeng Hu, Wei Han, Ning Pu

{"title":"Nickel-Induced Promotion Over Hydrogenation Catalysts: Insights from Model Porphyrin Deposition in the Absence of Vanadium Effects","authors":"Yuhao Du, Dawei Hu, Zhen Wang, Anpeng Hu, Wei Han, Ning Pu","doi":"10.1007/s10562-025-05121-6","DOIUrl":"10.1007/s10562-025-05121-6","url":null,"abstract":"<div><p>The hydrotreating of residual oil is crucial for producing cleaner fuels, as catalyst deactivation due to metal deposits, particularly nickel (Ni) and vanadium (V), remains a significant challenge. Contrary to the conventional view that metal deposits invariably poison catalysts, our recent studies have observed an unexpected enhancement in the activity of commercial NiMo/Al<sub>2</sub>O<sub>3</sub> catalysts during industrial operation. This study systematically investigates the mechanism behind this counter-intuitive phenomenon, with a particular focus on the effects induced by nickel. X-ray photoelectron spectroscopy (XPS) analysis revealed that low-concentration of Ni deposits preferentially formed highly active NiMoS phases during the reaction process, thereby minimized the formation of NiS<sub>x</sub>, a typical poisoning species. This increases the number of reactive sulfur sites, boosting the hydrodesulfurization (HDS) activity for 4,6-dimethyldibenzothiophene (4,6-DMDBT), with the conversion rate rising from 17.1 to 73.3%. Similar promoting trends were also observed in conventional NiMo/Al<sub>2</sub>O<sub>3</sub> catalysts upon Ni deposition, demonstrating the generality of this effect. Our findings not only provide new insights into the dual role of Ni deposits in catalyst performance but also offer a promising strategy designing industrial metal-poisoning-resistant catalysts with significantly enhanced operational lifespan as well as catalytic performance.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162038","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

Preparation of SrTiO3/PPy Composites and Photocatalytic Degradation of RhB SrTiO3/PPy复合材料的制备及其光催化降解RhB

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-04 DOI: 10.1007/s10562-025-05118-1

Lili Li, Jiaxin Li, Wen Xi, Jing Shu

{"title":"Preparation of SrTiO3/PPy Composites and Photocatalytic Degradation of RhB","authors":"Lili Li, Jiaxin Li, Wen Xi, Jing Shu","doi":"10.1007/s10562-025-05118-1","DOIUrl":"10.1007/s10562-025-05118-1","url":null,"abstract":"<div><p>Type-II SrTiO₃/PPy composites were successfully fabricated via in-situ oxidative polymerization to enhance the photocatalytic degradation efficiency of Rhodamine B (RhB). The composite design synergistically combined SrTiO₃ nanoparticles (synthesized with optimized VEG/VH₂O ratios) and polypyrrole (PPy), forming a core-shell architecture confirmed by XRD, TEM, and XPS analyses. Systematic screening of surfactants and pyrrole concentrations revealed that the composite with 5.2% pyrrole and anionic surfactant SDS exhibited optimal performance, achieving 97.60% RhB degradation under UV irradiation within 90 min. Bandgap analysis and radical trapping experiments demonstrated that the staggered Type-II heterojunction between SrTiO₃ and PPy facilitated efficient charge separation, while strong interfacial interactions promoted electron transfer from SrTiO₃ to PPy. This study elucidates the photocatalytic mechanism dominated by •O₂⁻ radicals and direct hole oxidation, providing a scalable strategy for designing high-performance photocatalysts through heterojunction engineering. The work highlights the critical role of surface chemistry and band alignment in environmental remediation applications.</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 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161401","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

Mesoporous Anatase–Brookite TiO2: Surface Acidity and Performance in Isopropanol Catalytic Dehydration 介孔锐钛矿-板钛矿TiO2：表面酸度及异丙醇催化脱水性能

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-04 DOI: 10.1007/s10562-025-05131-4

Nabil En.nami, Abdelhafid Ait Blal, Jaafar EL Fallah, Guillaume Clet, Konstantin Hadjiivanov, Françoise Maugé, Abdelakrim Aboulayt

{"title":"Mesoporous Anatase–Brookite TiO2: Surface Acidity and Performance in Isopropanol Catalytic Dehydration","authors":"Nabil En.nami, Abdelhafid Ait Blal, Jaafar EL Fallah, Guillaume Clet, Konstantin Hadjiivanov, Françoise Maugé, Abdelakrim Aboulayt","doi":"10.1007/s10562-025-05131-4","DOIUrl":"10.1007/s10562-025-05131-4","url":null,"abstract":"<div><p>The adsorption, catalytic and photocatalytic properties of titania strongly depend on its phase composition, morphology and the presence of impurities. In this work, we report new data on the surface acidity and catalytic performance of anatase–brookite TiO<sub>2</sub> and compare them with data for a commercial anatase–rutile system (TiO<sub>2</sub> Degussa P25). Pure titania was synthesized by the sol-gel method using titanium (IV) isopropoxide as a precursor. It consisted of anatase–brookite nanoparticles, as revealed by XRD, Raman spectroscopy and SEM. The sample has a monomodal, mesoporous structure with well-defined pore size around 7.5 nm. FTIR spectroscopy highlighted the impact of the bulk composition on the surface by identifying different hydroxyl groups associated with anatase and brookite TiO<sub>2</sub>. For both titania samples, the adsorption of 2,6-dimethylpyridine showed the existence of Lewis acid sites and two types of Brønsted acid sites of different strengths, but the density of all types of acid sites was much higher for the synthesized TiO<sub>2</sub> polymorph. Anatase–brookite TiO<sub>2</sub> is more active and selective in the dehydration of isopropanol to propene than TiO<sub>2</sub> Degussa P25, which is associated with the significantly higher surface acidity of this catalyst.</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 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161473","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

Structured Pt/NiCo2O4/C/NF Superhydrophobic Catalyst for Water-hydrogen Exchange Reactions 水-氢交换反应的结构Pt/NiCo2O4/C/NF超疏水催化剂

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-04 DOI: 10.1007/s10562-025-05123-4

Wenjia Jiang, Pingzhu Zhang, Qingqing Jia, Zhongao Zhang, Yaming Liu, Shilin Hu, Hao Ruan, Li Huang, Dong Wu, Zhi Zhao

{"title":"Structured Pt/NiCo2O4/C/NF Superhydrophobic Catalyst for Water-hydrogen Exchange Reactions","authors":"Wenjia Jiang, Pingzhu Zhang, Qingqing Jia, Zhongao Zhang, Yaming Liu, Shilin Hu, Hao Ruan, Li Huang, Dong Wu, Zhi Zhao","doi":"10.1007/s10562-025-05123-4","DOIUrl":"10.1007/s10562-025-05123-4","url":null,"abstract":"<p>Hydrophobic catalysts are essential for water-hydrogen exchange reactions to facilitate the separation of hydrogen isotopes. However, existing hydrophobic catalysts are primarily small-sized pelleted forms, which are not suitable for large-scale systems. In contrast, structured catalysts, which offer a low pressure drop and enhanced mass and heat transfer properties, present promising applications. In this work, cake-like nickel foam (NF) was selected as the structural support. Activated carbon was initially loaded onto the NF using silica sol, followed by hydrothermal deposition of NiCo<sub>2</sub>O<sub>4</sub> with a rough morphology, resulting in a carrier with high roughness and a large specific surface area. The carrier attained a superhydrophobic state after modification with heptadecafluorodecyltrimethoxysilane (FD-TMS), achieving a contact angle of 163.8°. The Pt/NiCo<sub>2</sub>O<sub>4</sub>/C/NF superhydrophobic catalyst was subsequently prepared by loading Pt particles via an impregnation-gas phase reduction method. This method exposes the active metal on the surface, enhancing the Pt utilization rate. Furthermore, the extensive surface area of the carrier provided numerous attachment sites for Pt, leading to smaller particle sizes and greater exposure of Pt precursors for reduction to zero-valent Pt. The results indicated that the Pt particle size in the catalyst was 2.31 nm, with 73% of the Pt in the zero-valent form. In water-hydrogen exchange reactions, the total volume mass transfer coefficient Kya for the Pt/NiCo<sub>2</sub>O<sub>4</sub>/C/NF superhydrophobic catalyst reached 17.35 × 10<sup>–2</sup> s<sup>–1</sup>, indicating strong catalytic performance. </p>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161472","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

Co3O4/Molecular Sieve Catalyst Activated Peroxymonosulfate Degradation of Tetracycline Hydrochloride Co3O4/分子筛催化过氧单硫酸酯降解盐酸四环素

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-01 DOI: 10.1007/s10562-025-05127-0

Rui Hu, Haiyin Wang, Jiahui Luo, Jianjun Song, Haiyuan Jia

{"title":"Co3O4/Molecular Sieve Catalyst Activated Peroxymonosulfate Degradation of Tetracycline Hydrochloride","authors":"Rui Hu, Haiyin Wang, Jiahui Luo, Jianjun Song, Haiyuan Jia","doi":"10.1007/s10562-025-05127-0","DOIUrl":"10.1007/s10562-025-05127-0","url":null,"abstract":"<div><p>Peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs) have been proven to be an effective method for the removal of tetracycline in water. In this study, the Co<sub>3</sub>O<sub>4</sub>/molecular sieve catalyst synthesized by the incipient wetness impregnation method was used for PMS activation. The effect of specific surface area on the catalytic performance of Co<sub>3</sub>O<sub>4</sub>/molecular sieve catalyst was investigated and analyzed in detail by characterization techniques. In the Tetracycline hydrochloride (TCH) degradation experiment, the Co<sub>3</sub>O<sub>4</sub>/13X catalyst exhibited the highest specific surface area (490.584 m<sup>2</sup>/g) and provide abundant active sites, enabling 98.0% TCH degradation within 30 min under optimal conditions (1.5 g catalyst, 0.3 mM PMS, pH 8.0, 25℃), with a reaction rate constant (k<sub>obs</sub>) of 0.0977 min<sup>-1</sup>. In addition, the degradation mechanism of TCH was explored using electron paramagnetic resonance (EPR) spectroscopy and quenching experiments. It was confirmed that free radicals (SO<sub>4</sub><sup>•−</sup>, •OH, O<sub>2</sub><sup>•−</sup>) and non-free radical species (<sup>1</sup>O<sub>2</sub>) generated during the reaction play a crucial role in the degradation process of TCH. In summary, the Co<sub>3</sub>O<sub>4</sub>/13X catalyst, when activating PMS, exhibits a remarkable synergistic effect on the degradation of TCH, and shows good repeatability and environmental adaptability. This study provides valuable insights into the design and optimization of catalysts for degrading antibiotic pollutants in water treatment processes.</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 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154134","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

Efficient Chromia-Alumina Catalysts with Hierarchical Porous Structure for Isobutane Dehydrogenation in Fixed-Bed Reactor 固定床异丁烷脱氢高效分级孔结构铬-氧化铝催化剂

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-07-31 DOI: 10.1007/s10562-025-05126-1

A. I. Zolotukhina, G. V. Mamontov

引用次数: 0

Ethanol Conversion to Linear Olefin Over Phosphorus-Modified Beta Zeolite Catalysts 磷修饰β沸石催化剂上乙醇转化成线性烯烃的研究

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-07-31 DOI: 10.1007/s10562-025-05116-3

Ghassan Jasim Hadi, Ali Hosin Alibak

{"title":"Ethanol Conversion to Linear Olefin Over Phosphorus-Modified Beta Zeolite Catalysts","authors":"Ghassan Jasim Hadi, Ali Hosin Alibak","doi":"10.1007/s10562-025-05116-3","DOIUrl":"10.1007/s10562-025-05116-3","url":null,"abstract":"<div><p>This study experimentally investigates the effects of modification techniques (post-synthesis impregnation and isomorphous substitution), phosphorus loading, Si/Al ratio, and time on stream on the performance of zeolite-based catalysts in the selective conversion of ethanol into linear olefins. Firstly, the involved catalysts (i.e., pristine and phosphorus-modified beta zeolites) have been characterized using Nuclear magnetic resonance (NMR), temperature-programmed desorption of ammonia (NH<sub>3</sub>-TPD), X-ray diffraction (XRD), thermogravimetric analysis (TGA), N<sub>2</sub> physisorption, <sup>31</sup>P MAS NMR, and Energy-dispersive X-ray spectroscopy (STEM-EDS). These characterization tests are employed to monitor the impact of phosphorus loading on the structural, textural, acidic, and hydrophobic properties of the zeolite-based catalysts. Increasing the modifying the phosphorus loading of the beta zeolite from 0 to 5 wt% increases ethanol conversion from 92 to 94% and improves their selectivity toward C<sub>4</sub>-C<sub>12</sub> linear olefins from 52 to 72%. Also, modifying the beta zeolite by the post-synthesis impregnation method results in higher ethanol conversion and lower selectivity toward linear olefins than the isomorphous substitution approach. Increasing the Si/Al ratio from 25 to 50 results in decreasing the ethanol conversion from 94 to 85% and increasing the selectivity towards C<sub>4</sub>-C<sub>12</sub> linear olefins from 63 to 70% for the catalyst containing 3 wt% of phosphorus. Experimental data is employed to propose a reaction mechanism and elucidate the fundamental roles of phosphorus loading in regulating the reaction pathways. The findings of this study provide valuable insights into the design and optimization of phosphorus-modified zeolite catalysts, enabling the efficient and selective production of linear olefins from ethanol.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171210","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