Applied Catalysis A: General最新文献_第2页

Selective oxidation of methane to formaldehyde and carbon monoxide over V/MSN catalysts with isolated VO4 sites 在具有孤立 VO4 位点的 V/MSN 催化剂上将甲烷选择性氧化为甲醛和一氧化碳

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-30 DOI: 10.1016/j.apcata.2024.119928

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Active site requirements for bio-alcohol dehydration: Effect of chemical structure and site proximity 生物酒精脱水的活性位点要求：化学结构和邻近部位的影响

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-30 DOI: 10.1016/j.apcata.2024.119939

{"title":"Active site requirements for bio-alcohol dehydration: Effect of chemical structure and site proximity","authors":"","doi":"10.1016/j.apcata.2024.119939","DOIUrl":"10.1016/j.apcata.2024.119939","url":null,"abstract":"<div>Synthesis-structure-activity relations are reported, describing how interzeolite conversion (IZC) allows synthesis of ZSM-5 (MFI framework) with fixed physicochemical properties, except the variable local acid site (Al) arrangement, by variation of the synthesis time. Local confinement and acidity effects are probed by applying both H-ZSM-5 and Na-ZSM-5 samples in alcohol dehydration. Pyridine and divalent cobalt ion probing are used to quantify the amount of accessible acid sites and of Al in close proximity. Al in close proximity shows a strong influence on n-butanol dehydration turnover rates. The turnover rates are also strongly dependent on local confinement: in Na-form, ZSM-5 synthesized with more Al present as isolated species is a factor of 3–7 times more active than Na-ZSM-5 with fewer isolated Al. However if the zeolites are in proton form, ZSM-5 with more proximate sites show a higher activity compared to ZSM-5 with more isolated sites. Linear butene selectivity increases in Na-ZSM-5 compared to H-ZSM-5, caused by a suppressed dibutyl ether formation. The selectivity towards 1-butene is enhanced to a greater extent on proximate sites, likely due to a local/steric constraint at the active site. Decomposition of DBE over Na-ZSM-5 is more active compared to n-butanol dehydration, independent of acid site proximity. Also for 2-propanol dehydration, Na-ZSM-5 is less active than H-ZSM-5, yet the activity difference is attenuated compared to n-butanol dehydration. Essentially, due to the intrinsic higher reactivity of 2-propanol, the acid site requirement is less stringent. These findings highlight the importance of local confinement and Al proximity in acid-catalyzed conversion of oxygenated compounds.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142137302","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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Oxidation of 2,5-bis(hydroxymethyl)furan to 2,5-furandicarboxylic acid with morphology-dependent Au/CeO2 catalysts 使用形态依赖性 Au/CeO2 催化剂将 2,5-双（羟甲基）呋喃氧化为 2,5-呋喃二甲酸

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-28 DOI: 10.1016/j.apcata.2024.119929

{"title":"Oxidation of 2,5-bis(hydroxymethyl)furan to 2,5-furandicarboxylic acid with morphology-dependent Au/CeO2 catalysts","authors":"","doi":"10.1016/j.apcata.2024.119929","DOIUrl":"10.1016/j.apcata.2024.119929","url":null,"abstract":"<div>2,5-Furandicarboxylic acid (FDCA), a bio-based diacid with a rigid ring, has a similar structure to petroleum-based terephthalic acid. Its co-polyester with ethylene glycol has excellent performance in terms of thermal and mechanical properties. Herein, an Au/CeO2-rod catalyst with rich oxygen vacancies was developed to achieve the efficient oxidation of 2,5-bis(hydroxymethyl)furan (BHMF) to FDCA with a 92 % yield under mild conditions, with the addition of 4 equivalents of Na2CO3 at 80℃ under 2 MPa O2 for 6 h. The large specific surface area of CeO2-rod is beneficial for better dispersion of Au nanoparticles. Meanwhile, the high activity of Au/CeO2-rod can be attributed to that the rod-shaped CeO2 exposed more active (100) facets, resulting in strong metal-support interaction between Au nanoparticles and CeO2-rod. This could generate more Au species with oxidized state and more oxygen vacancies, thus promoting the reactant adsorption and oxygen activation and enhancing the final oxidation activity. The oxidation of 5-hydroxymethyl-2-furancarboxylic acid to FDCA was determined as the rate-determining step in the oxidation of BHMF over the Au/CeO2 catalyst.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142129194","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

2D/2D Bi2WO6/C3N5 S-scheme heterojunction for highly selective production of CH4 by photocatalytic CO2 reduction under visible light 二维/二维 Bi2WO6/C3N5 S 型异质结在可见光下通过光催化二氧化碳还原高选择性地生产 CH4

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-28 DOI: 10.1016/j.apcata.2024.119914

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Investigation of different ratio of CuCe catalysts applied in photothermal reverse water gas shift reaction 不同配比的 CuCe 催化剂在光热反向水气变换反应中的应用研究

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-27 DOI: 10.1016/j.apcata.2024.119927

{"title":"Investigation of different ratio of CuCe catalysts applied in photothermal reverse water gas shift reaction","authors":"","doi":"10.1016/j.apcata.2024.119927","DOIUrl":"10.1016/j.apcata.2024.119927","url":null,"abstract":"<div>The photothermal catalytic reverse water gas shift reaction (RWGS) can convert CO2 into other high-value-added chemical resources under mild conditions. However, the design and development of high-performance catalysts is a major challenge. In this work, different proportions of CuCe bimetallic catalysts were synthesized using the sol-gel method and applied to RWGS. Under the visible light heat catalytic condition at 450 ℃, the CO yield can be increased by about 20 % compared to thermal catalysis, which is better than most metal-based catalysts reported in the literature. Moreover, the catalyst exhibited good stability and reusability, with the primary factor affecting the stability of the CuCe catalyst being the growth of Cu nanoparticles. The characterization shows that at Cu/Ce=1, the separation efficiency of electron-hole separation is the highest, and the hot electrons generated by the LSPR effect of Cu can be effectively separated and transferred, producing more oxygen vacancies and suitable alkaline sites, so it has the best photothermal catalytic performance. Furthermore, the catalyst is dominated by the formate pathway under light conditions, and this work provides a new RWGS strategy.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142089296","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

Dipyridyl-anderson-polyoxometalate built-in metal–organic frameworks for aerobic photooxidation 用于有氧光氧化的二吡啶基-安德森-聚氧化金属内置金属有机框架

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-27 DOI: 10.1016/j.apcata.2024.119913

引用次数: 0

Zinc ferro- and ferri-cyanides catalyst structures from point of colloid chemistry view 从胶体化学角度看锌铁氰化物和锌铁氰化物催化剂结构

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-25 DOI: 10.1016/j.apcata.2024.119902

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γ-aminobutyric acid-assisted fabrication of plate-like ZSM-5 zeolite for efficient propylene production from methanol conversion γ-氨基丁酸辅助制备板状 ZSM-5 沸石，用于高效生产甲醇制丙烯

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-25 DOI: 10.1016/j.apcata.2024.119912

引用次数: 0

The synthesis of Ni-Co@NOMC and the regulation of its active sites for the selective conversion of furfural to cyclopentanone Ni-Co@NOMC 的合成及其活性位点在糠醛选择性转化为环戊酮过程中的调节作用

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-25 DOI: 10.1016/j.apcata.2024.119915

引用次数: 0

Catalytic recycling of polylactic acid over zirconium phosphate supported WOx active sites 在磷酸锆支撑的 WOx 活性位点上催化聚乳酸的回收利用

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-08-24 DOI: 10.1016/j.apcata.2024.119917

{"title":"Catalytic recycling of polylactic acid over zirconium phosphate supported WOx active sites","authors":"","doi":"10.1016/j.apcata.2024.119917","DOIUrl":"10.1016/j.apcata.2024.119917","url":null,"abstract":"<div>Chemical upcycling of end-of-life plastics is an economically and environmentally feasible way to tackle plastics crisis. Among them, methanol alcoholysis of polylactic acid (PLA) is a promising approach, which can produce methyl lactate (MLA) that can be further converted to lactide to achieve a sustainable development. In this work, a series of WOx/ZrP catalysts with WOx active sites in low coverage and high surface area were synthesized via anchoring WOx species on the surface of zirconium phosphate (ZrP). Characterizations indicated that the strong interaction between WOx and ZrP promoted the formation of WOx active sites in low coverage. In particular, 10 %WOx/ZrP catalyst was highly active and stable for the alcoholysis of PLA plastics under mild conditions due to the abundant WOx active sites and strong acidity. The yield of MLA over 10 %WOx/ZrP catalyst reached 94.5 % within 4 h at 160 °C, which was superior to the performance of traditional solid acids (α-ZrP, HZSM-5, Hβ and Amberlyst-45). In addition, 10 %WOx/ZrP was versatile for the alcoholysis of discarded PLA-based products and could be recycled at least five times. The prominent performance of 10 %WOx/ZrP catalyst and the possible reaction mechanism were discussed.</div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142083377","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