Applied Catalysis A: General最新文献_第4页

Activation of NO with microwave irradiation for low temperature direct decomposition 用微波辐照活化 NO，实现低温直接分解

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-16 DOI: 10.1016/j.apcata.2024.119965

{"title":"Activation of NO with microwave irradiation for low temperature direct decomposition","authors":"","doi":"10.1016/j.apcata.2024.119965","DOIUrl":"10.1016/j.apcata.2024.119965","url":null,"abstract":"<div>Direct decomposition of nitric oxide (NO) on metal oxides under microwave (MW) irradiation was investigated and it was found that the most metal oxides show higher NO decomposition activity than that in the conventional electric furnace heating at low temperature. Among the examined oxides, it was found that TiO2, CeO2, ZrO2, and Y2O3 show about 95 % or higher NO conversion at 573 K, and both N2 and O2 are formed with almost equimolar amount. In particular, ZrO2 exhibited high and stable NO decomposition activity more than 25 h. In this study, the influence of coexisting gases on NO decomposition activity on ZrO2 under microwave heating was further investigated and the direct decomposition of NO can be proceeded even in the presence of 5 % O2, 5 % CO2, or humidified condition. Mechanism of high NO decomposition activity under MW irradiation was also studied and it was found that removal of oxygen from the catalyst was much increased under MW irradiation because of direct activation of oxygen and also direct activation of NO which is also suggested by pulse reaction.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0926860X24004101/pdfft?md5=7d9311a70d809155b992c942b5fbd8c2&pid=1-s2.0-S0926860X24004101-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Oxygen vacancies promoted hydrogen production from methanol aqueous phase reforming over MgAl−LDHs supported plasmonic Ru nanoparticles catalyst 氧空位促进了 MgAl-LDHs 支持的等离子 Ru 纳米粒子催化剂在甲醇水相重整中制氢

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-13 DOI: 10.1016/j.apcata.2024.119964

引用次数: 0

Mass transfer-enhanced platform for heterogeneous dual organocatalysis to boost yield and diastereoselectivity in enantioselective Michael/benzoin cascade reaction 用于异质双有机催化的传质强化平台，提高对映体选择性迈克尔/安息香级联反应的产率和非对映选择性

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-13 DOI: 10.1016/j.apcata.2024.119956

{"title":"Mass transfer-enhanced platform for heterogeneous dual organocatalysis to boost yield and diastereoselectivity in enantioselective Michael/benzoin cascade reaction","authors":"","doi":"10.1016/j.apcata.2024.119956","DOIUrl":"10.1016/j.apcata.2024.119956","url":null,"abstract":"<div>Mass transfer limitation and tedious anchoring of multiple expensive chiral organocatalysts are the key bottlenecks in heterogeneous asymmetric cascade/tandem reactions, leading to high-cost processes with low catalytic performances. In this paper, two chiral organocatalysts, including (S)-diphenylprolinoltrimethylsilyl ether (ProTMS) and N-heterocyclic carbenes (NHC), are simultaneously immobilized to hollow mesoporous polystyrene nanospheres (HMPNs) in one-pot via Friedel-Crafts alkylation to afford supported dual organocatalysts (ProTMS&NHC@HMPNs) at low cost. The catalyst possesses the spherical morphology with a hollow interior and a thin mesopore-abundant shell, providing suitable environments for reactants to quickly access to the catalytic sites of NHC and ProTMS. The side reactions caused by limited mass transfer are effectively suppressed, and superior yields (70–92 %) and diastereoselectivities (dr = 3:1<img>20:1) to homogeneous catalysis are achieved in heterogeneous Michael/benzoin cascade reaction. Overall, the mass transfer-enhanced platform for efficient heterogeneous dual organocatalysis is developed to boost yield and diastereoselectivity in asymmetric cascade reactions.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241381","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

Ga-doped spinel-typed Co-Al catalysts for CO2-assisted ethane dehydrogenation 用于二氧化碳辅助乙烷脱氢的掺嘎尖晶石型 Co-Al 催化剂

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-12 DOI: 10.1016/j.apcata.2024.119959

引用次数: 0

Corrigendum: The piezoelectric and piezo-photoelectric effects: Emerging strategies for catalytic performance enhancement of low-dimensional nanostructures 更正：压电效应和压光电效应：提高低维纳米结构催化性能的新策略

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-12 DOI: 10.1016/j.apcata.2024.119943

引用次数: 0

Quantification of competitive adsorptions between sulfur and olefinic model compounds representative of a FCC gasoline over a CoMoS/Al2O3 catalyst: Theoretical and experimental approaches 在 CoMoS/Al2O3 催化剂上对硫和代表催化裂化汽油的烯烃模型化合物之间的竞争性吸附进行量化：理论和实验方法

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-12 DOI: 10.1016/j.apcata.2024.119962

引用次数: 0

TiO2 promoted alcohol dehydrations on the Wells-Dawson type heteropolyacids 二氧化钛促进威尔斯-道森型杂多酸的醇脱水作用

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-12 DOI: 10.1016/j.apcata.2024.119947

引用次数: 0

Actual reliance of catalytic activities tuned oxygen vacancies on VOx/Ce1-xZrxO2 catalyst for selective oxydehydrogenation of methanol to dimethoxymethane 调整 VOx/Ce1-xZrxO2 催化剂上氧空位的催化活性对甲醇选择性氧脱氢生成二甲氧基甲烷的实际依赖性

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-12 DOI: 10.1016/j.apcata.2024.119961

{"title":"Actual reliance of catalytic activities tuned oxygen vacancies on VOx/Ce1-xZrxO2 catalyst for selective oxydehydrogenation of methanol to dimethoxymethane","authors":"","doi":"10.1016/j.apcata.2024.119961","DOIUrl":"10.1016/j.apcata.2024.119961","url":null,"abstract":"<div>Metal oxide catalysts like ceria-supported vanadia (VOx/Ce1-xZrxO2) with different Zr contents were prepared by coupling ceria-zirconia solid solution and vanadia. Characterization revealed that the insertion of zirconia into ceria significantly improved catalytic activity due to the generation of more oxygen vacancies and distortion of the composite structure. The oxygen vacancy concentration initially increased with the increase of Zr (x= wt%) and peaked at x=0.7 and then decreased. The reliance of oxygen vacancy concentration in VOx/Ce1-xZrxO2 catalyst on their catalytic activity in methanol oxydehydrogenation was further investigated. Results indicated that oxygen vacancies not only activated oxygen species but also cleaved C–H bonds alongside V5+ active site contained terminal oxygen atoms for cleaving O–H and C–H bonds within the adsorbed methanol. The VOx/Ce0.3Zr0.7O2 exhibited the best catalytic activity with the methanol conversion of 76 % and the dimethoxymethane selectivity of 96 % at 200 ℃ and atmospheric pressure in a fixed-bed reactor.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142230365","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

Defect engineering to accelerate charge transport in LaFeO3 photocathodes via thermal oxidation: A combined experimental and theoretical study 通过热氧化加速 LaFeO3 光阴极中电荷传输的缺陷工程：实验与理论相结合的研究

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-12 DOI: 10.1016/j.apcata.2024.119960

引用次数: 0

Selective reduction of CO2 to CO over alumina-supported catalysts of group 5 transition metal carbides 在氧化铝支撑的第 5 族过渡金属碳化物催化剂上将 CO2 选择性还原为 CO

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-09-12 DOI: 10.1016/j.apcata.2024.119963

{"title":"Selective reduction of CO2 to CO over alumina-supported catalysts of group 5 transition metal carbides","authors":"","doi":"10.1016/j.apcata.2024.119963","DOIUrl":"10.1016/j.apcata.2024.119963","url":null,"abstract":"<div>We show the applicability of a preparation method, previously reported for obtaining tailored bulk VCx catalysts, for alumina-supported G5TMCs. The characteristics of the G5TMCs/Al2O3 catalysts and their behaviour in the selective reduction of CO2 to CO through the RWGS reaction is reported. VCx/Al2O3 catalysts were active, stable and highly selective; meanwhile NbC/Al2O3 and TaC/Al2O3 were not active. VCx/Al2O3 catalysts exhibited selectivity to CO over 99.5 % at temperature above 773 K. The characteristics of alumina-supported vanadium carbide particles depended on the vanadium precursor and on the atmosphere used during the catalyst preparation. XPS characterization of VCx/Al2O3 catalysts revealed the presence of carbide species on surface before and after RWGS reaction. The catalytic behaviour of VCx/Al2O3 is analysed in the light of their characteristics and compared with bulk VCx counterparts. The most performant catalyst, VC(Pr)/Al2O3, was stable over 4 days at 723 K, with ∼100 % selectivity to CO and CO2 conversion of ∼11 %.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0926860X24004083/pdfft?md5=293c77c63c14770c68e3f040e986dd12&pid=1-s2.0-S0926860X24004083-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142241380","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0