Applied Catalysis A: General最新文献_第10页

Tutorial review on catalyst characterization and materials preparation for x-ray powder diffraction analysis

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-12-30 DOI: 10.1016/j.apcata.2024.120093

Collette L. Nicholas , John P.S. Mowat , Christopher P. Nicholas

引用次数: 0

Experimental and mechanism investigation on CO catalytic oxidation performance based on CuMn2O4 catalysts

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-12-27 DOI: 10.1016/j.apcata.2024.120091

Kun Wang , Kunlun Li , Shengnan Zhao , Zezhou Ran , Fuqing Wang

{"title":"Experimental and mechanism investigation on CO catalytic oxidation performance based on CuMn2O4 catalysts","authors":"Kun Wang , Kunlun Li , Shengnan Zhao , Zezhou Ran , Fuqing Wang","doi":"10.1016/j.apcata.2024.120091","DOIUrl":"10.1016/j.apcata.2024.120091","url":null,"abstract":"<div><div>To reduce the carbon monoxide (CO) emissions in sintering flue gas, this study employed a catalytic oxidation approach to convert CO into carbon dioxide (CO2) at low temperatures. The Cu-Mn catalysts were synthesized using co-precipitation methods. The effects of various reaction conditions, such as the Cu/Mn ratio and reaction temperatures, on CO catalytic efficiency was investigated. The results indicated that when the Cu/Mn ratio was 1:2, the catalytic efficiency was 98.34 % at approximately 105 °C. Furthermore, the catalysts remained stable after continuous testing. Based on density functional theory (DFT), a model for the adsorption of CO molecules was established. The adsorption characteristics between CuMn2O4 and CO, as well as the changes in surface charge distribution before and after adsorption, were systematically investigated. The research results indicated that the adsorption of CO on the surface of CuMn2O4 is a chemical adsorption process. Among the various adsorption sites, CO exhibits a greater affinity for the Mn-top site, with an adsorption energy of − 1.18 eV. During the adsorption process, some electrons from CO are transferred to the surface of the catalyst, resulting in orbital hybridization. Additionally, this paper investigated the reaction pathways involved in the CO oxidation process. These findings provide new insights for the optimization and screening of catalysts, which are significant for the fields of industrial flue gas purification and catalytic science.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"692 ","pages":"Article 120091"},"PeriodicalIF":4.7,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Sodium-doped La2Ti2O7 synthesized by molten salt synthesis method for photocatalytic overall water splitting

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-12-19 DOI: 10.1016/j.apcata.2024.120079

Lijiao Zhong , Xing Li , Yiquan Zhan , Yongsheng Liu , Kai Yang , Jinbiao Liu , Shiyong Liu , Junzhe Jiang , Liqing Li , Yoshihisa Sakata

{"title":"Sodium-doped La2Ti2O7 synthesized by molten salt synthesis method for photocatalytic overall water splitting","authors":"Lijiao Zhong , Xing Li , Yiquan Zhan , Yongsheng Liu , Kai Yang , Jinbiao Liu , Shiyong Liu , Junzhe Jiang , Liqing Li , Yoshihisa Sakata","doi":"10.1016/j.apcata.2024.120079","DOIUrl":"10.1016/j.apcata.2024.120079","url":null,"abstract":"<div><div>Solar-driven hydrogen production through water splitting is currently one of the research hotspots nowadays. Lanthanum titanate (La2Ti2O7) is one kind of layered-structure perovskite photocatalyst and possesses a superior electronic structure for photocatalytic overall water splitting. However, it suffers from several drawbacks, such as poor photo absorption and easy recombination of photogenerated charge carriers. In this study, sodium (Na) ion-doped La2Ti2O7 with plate-like crystal morphology was synthesized by using molten salt synthesis (MSS). The XRD and TEM results indicated that the MSS method enhanced the crystallinity of La2Ti2O7. UV–vis, Raman and EPR spectra disclosed that Na doping through MSS introduced oxygen vacancies. The Na (0.3 mol%)-doped La2Ti2O7 (MSS) provided the optimal hydrogen evolution rate, and the value was 6.43 times greater than that of pure La2Ti2O7 synthesized by traditional solid-state reaction method. The synergistic effect of crystal facet engineering and defect engineering remarkably enhanced the photocatalytic activity of La2Ti2O7.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"692 ","pages":"Article 120079"},"PeriodicalIF":4.7,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143137610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Assessment of process integration of an up-scaled Fischer-Tropsch-catalyst

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-12-17 DOI: 10.1016/j.apcata.2024.120081

Maximilian Medicus, Judith Mettke, Florian Wolke, Johannes Abel, Michael Gallwitz, Erik Reichelt

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Confinement and synergy effect of bimetallic Cu-Ni clusters encapsulated in Beta zeolite for methyl acetate formation from methanol alone β沸石包封Cu-Ni双金属簇对甲醇合成乙酸甲酯的约束和协同效应

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-11-28 DOI: 10.1016/j.apcata.2024.120045

Meng Liu , Caixia Miao , Zhijie Wu

{"title":"Confinement and synergy effect of bimetallic Cu-Ni clusters encapsulated in Beta zeolite for methyl acetate formation from methanol alone","authors":"Meng Liu , Caixia Miao , Zhijie Wu","doi":"10.1016/j.apcata.2024.120045","DOIUrl":"10.1016/j.apcata.2024.120045","url":null,"abstract":"<div><div>The direct synthesis of methyl acetate (MA) from methanol is an appealing and green approach, but an efficient catalyst is urgently needed. Herein, Cu-Ni bimetallic clusters, with a diameter of ∼1.2 nm, have been successfully encapsulated within BEA zeolite by an in-situ two-step encapsulation method (Cu-Ni@Beta), which significantly favors the dispersion of metals compared to the ion-exchanging (Cu/Ni@Beta) and wet impregnation approach (Cu-Ni/Beta). The as-synthesized Cu-Ni@Beta catalyst shows a MA formation rate of 1.46 mmol s−1 g(Cu+Ni)−1, which is much higher than Cu/Ni@Beta of 0.02 mmol s−1 g(Cu+Ni)−1 and Cu-Ni/Beta of 0.12 mmol s−1 g(Cu+Ni)−1. Characterization studies reveal that zeolite constraints could not only provide the spatial confinement for metal clusters but also induce an electronic interaction between confined Cu and Ni species in Cu-Ni@Beta. This interaction can increase and stabilize Cu+ sites as well as Lewis acid sites, which are crucial for improving catalytic performance. In-situ FTIR experiments indicate that the formation of formaldehyde (CH2O*) is the critical step for methanol to MA, and the CH2O* further couples with methoxy (CH3O*) to form acetate species (CH3CHO*), which subsequently couples with CH3O* to produce MA.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"690 ","pages":"Article 120045"},"PeriodicalIF":4.7,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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Promotional effect of external magnetic field in FexOy/ZSM-5 for selective CO2 hydrogenation to C2–C4 and aromatic hydrocarbons 外磁场对FexOy/ZSM-5中CO2选择性加氢生成C2-C4和芳烃的促进作用

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-11-27 DOI: 10.1016/j.apcata.2024.120036

Ratchanon Chotchaipitakkul , Sirapat Munpollasri , Waleeporn Donphai , Wanwisa Limphirat , Yingyot Poo-arporn , Supinya Nijpanich , Pongsakorn Jantaratana , Thongthai Witoon , Paisan Kongkachuichay , Metta Chareonpanich

{"title":"Promotional effect of external magnetic field in FexOy/ZSM-5 for selective CO2 hydrogenation to C2–C4 and aromatic hydrocarbons","authors":"Ratchanon Chotchaipitakkul , Sirapat Munpollasri , Waleeporn Donphai , Wanwisa Limphirat , Yingyot Poo-arporn , Supinya Nijpanich , Pongsakorn Jantaratana , Thongthai Witoon , Paisan Kongkachuichay , Metta Chareonpanich","doi":"10.1016/j.apcata.2024.120036","DOIUrl":"10.1016/j.apcata.2024.120036","url":null,"abstract":"<div><div>This study employed confined-space ZSM-5 zeolite in conjunction with an external magnetic field to manipulate iron oxide phase transformations, thereby enhancing CO2 hydrogenation and the selective production of larger hydrocarbons. Phase transformations of iron oxide were controlled by varying reduction times (0.0–6.0 h) and magnetic flux intensities (0.0–27.7 mT). The FexOy/ZSM-5 zeolite catalyst, at 20.7 mT, exhibited a predominant Fe3O4 phase, achieving the highest CO2 conversion (28.1 %, or 3.3 times higher) and producing 14.4 times more C2–C4 hydrocarbons compared to catalysts without a magnetic field. The combined effects of confined-space ZSM-5 zeolite and the magnetic field simultaneously achieved control over reactant gas diffusion and facilitated formation of Fe3O4 and FeO phases. Olefins, formed via the reverse water-gas shift reaction, underwent chain growth reactions through Fischer-Tropsch synthesis and aromatization within the ZSM-5 zeolite. This approach presents promising opportunities for environmentally friendly CO2 conversion.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"690 ","pages":"Article 120036"},"PeriodicalIF":4.7,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Acid washing-assisted synthesis of porous Co3O4 nanosheet catalyst featuring efficient benzene oxidation performance 酸洗辅助合成具有高效苯氧化性能的多孔Co3O4纳米片催化剂

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-11-26 DOI: 10.1016/j.apcata.2024.120044

Chunyan Deng , Qun Li , Wanting Huang , Dong Xia , Peng Huang , Ruifang Lu , Luxi Tan , Lichun Dong

{"title":"Acid washing-assisted synthesis of porous Co3O4 nanosheet catalyst featuring efficient benzene oxidation performance","authors":"Chunyan Deng , Qun Li , Wanting Huang , Dong Xia , Peng Huang , Ruifang Lu , Luxi Tan , Lichun Dong","doi":"10.1016/j.apcata.2024.120044","DOIUrl":"10.1016/j.apcata.2024.120044","url":null,"abstract":"<div><div>Co-based catalysts exhibit considerable catalytic activity in oxidative reactions, yet challenges remain in synthesizing Co3O4 materials featuring both large surface area and high activity. Here, ultrathin La0.029CoOx nanosheets were post-treated with various concentrations of dilute nitric acid to obtain the two-dimensionally geometric Co3O4-H nanosheets catalysts. Among them, the resultant Co3O4-0.1H catalyst disclosed significantly enhanced catalytic activity, enabling to achieve 100 % conversion of benzene at 230 °C under an ultrahigh weight hourly space velocity (WHSV) of 60,000 mL·g−1·h−1. Additionally, the catalyst also displayed excellent catalytic durability and well catalytic stability over 5 cyclic tests and 45 h of long-period operation. A thorough characterization results revealed that the superior catalytic performance of Co3O4-0.1H was attributed to its distinct nanosheet morphology, high specific surface area and abundant surface defect sites. This work highlights the effectiveness and simplicity of acid washing treatment strategy in improving the catalytic oxidation activity of transition metal oxide catalysts.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"690 ","pages":"Article 120044"},"PeriodicalIF":4.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Single-atom catalysts supported on covalent triazine frameworks 共价三嗪骨架负载的单原子催化剂

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-11-26 DOI: 10.1016/j.apcata.2024.120035

Fedor S. Golub , Quanjun Xiang , Dmitri A. Bulushev

引用次数: 0

Production of γ-valerolactone from furfural by core-shell ZSM-5 supporting Ru-Zr bimetals through enhanced cascade reaction 核壳 ZSM-5 支承 Ru-Zr 双金属通过增强级联反应从糠醛制取γ-戊内酯

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-11-19 DOI: 10.1016/j.apcata.2024.120031

Yi Yuan , Xiaozhou Chen , Longbin Deng , Shuaishuai Zhou , Congzhen Qiao , Zhenheng Diao , Hongyan Wang , Yajie Tian

{"title":"Production of γ-valerolactone from furfural by core-shell ZSM-5 supporting Ru-Zr bimetals through enhanced cascade reaction","authors":"Yi Yuan , Xiaozhou Chen , Longbin Deng , Shuaishuai Zhou , Congzhen Qiao , Zhenheng Diao , Hongyan Wang , Yajie Tian","doi":"10.1016/j.apcata.2024.120031","DOIUrl":"10.1016/j.apcata.2024.120031","url":null,"abstract":"<div><div>In this study, a catalyst comprising Ru-Zr bimetals supported on core-shell ZSM-5 zeolite is tailored for catalytic conversion of furfural to yield γ-valerolactone via promoted two-step cascade reaction. ZrO2 encapsulated within hierarchical ZSM-5 zeolite is synthesized via a one-pot hydrothermal method, followed by sequential treatment with NaOH to yield Zr@ZSM-OH. Subsequently, the RuO2 component is introduced through impregnation, followed by calcination to obtain Ru-Zr@ZSM-OH. In conversion of furfural, the synergistic effect of highly dispersed ZrO2 acting as Lewis acid sites, combined with Brønsted acid sites provided by zeolite, facilitates the production of isopropyl levulinate via catalytic hydrogenation transfer, under either H2 or N2 atmosphere. In the secondary step, the introduced RuO2 promotes the adsorption and spillover of active H2, thereby accelerating the conversion of isopropyl levulinate to γ-valerolactone. The as-synthesized Ru-Zr@ZSM-OH catalyst achieves an impressive yield of 92.6 wt% of γ-valerolactone after just a 2 h reaction at 175 °C.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"690 ","pages":"Article 120031"},"PeriodicalIF":4.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142703789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Insight into the coke alleviation pattern over iron-based and boron-modified HZSM-5 bifunctional catalyst for direct CO2 hydrogenation to aromatics 铁基和硼改性 HZSM-5 双功能催化剂在二氧化碳直接加氢制芳烃过程中焦炭缓解模式的深入研究

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-11-19 DOI: 10.1016/j.apcata.2024.120029

Chonghao Chen , Zixin Song , Dianhua Liu

{"title":"Insight into the coke alleviation pattern over iron-based and boron-modified HZSM-5 bifunctional catalyst for direct CO2 hydrogenation to aromatics","authors":"Chonghao Chen , Zixin Song , Dianhua Liu","doi":"10.1016/j.apcata.2024.120029","DOIUrl":"10.1016/j.apcata.2024.120029","url":null,"abstract":"<div><div>Carbon dioxide (CO2) hydrogenation to aromatics is promising for reducing the burden of petroleum fuels. Herein, iron-based catalyst was mixed with boron modified HZSM-5 with pre-treatment and post-treatment method. The textural, acidic and element distribution properties over zeolite framework and external surface were studied. Combining with characterizations for internal and external coke, the element distribution-acidity-coke-stability relationship over boron-modified zeolite was put forward. Pre-treated zeolite witnessed reduced amount of external and total Brönsted acid sites (BAS) with similar degree, and increase paired Al (Alpair) fraction in the intersection site, leading to increased aromatics selectivity and reduced coke amount. While boron post-treatment significantly reduced external surface BAS and inhibited formation of condensed external coke. Afterwards, the mechanism of olefins aromatization was studied and found that PT-Z5-B greatly suppressed the overalkylation of light aromatics, thus alleviating the co-deactivation pattern generated by transformation of coke precursors from zeolite to iron-based catalyst.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":"689 ","pages":"Article 120029"},"PeriodicalIF":4.7,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142702561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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