Applied Catalysis A: General最新文献_第2页

The efficient metal- and halogen-free polymer catalyst for the intensification on CO2 cycloaddition 用于强化 CO2 环化反应的高效无卤金属聚合物催化剂

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-23 DOI: 10.1016/j.apcata.2024.119996

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Preparation of CuCo2O4@NFs nanoflower material with abundant VO/VCo: An excellent catalyst for oxidative breakage of the β-O-4 bond of lignin 制备具有丰富 VO/VCo 的 CuCo2O4@NFs 纳米花材料：氧化断裂木质素 β-O-4 键的优良催化剂

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-18 DOI: 10.1016/j.apcata.2024.119983

{"title":"Preparation of CuCo2O4@NFs nanoflower material with abundant VO/VCo: An excellent catalyst for oxidative breakage of the β-O-4 bond of lignin","authors":"","doi":"10.1016/j.apcata.2024.119983","DOIUrl":"10.1016/j.apcata.2024.119983","url":null,"abstract":"<div><div>A hollow nanoflower material CuCo2O4@NFs with abundant oxygen vacancies (VO) and cobalt vacancies (VCo) was prepared by a simple method. The novel material CuCo2O4@NFs showed excellent oxidation activity, cleaving the β-O-4 bond in lignin model compounds. Conversion of the substrate was as high as 99.02 %, and the yield of the main product, phenol, reached 49.50 %. Structural analysis showed that the petal and cavity form of the material increased its specific surface area, which facilitated its full contact with O2 molecules. Moreover, the VO generated by lattice oxygen detachment during annealing favor the adsorption of O2, and the VCo generated through lattice distortion induced by Cu-metal doping promoted the detachment of oxygen intermediates. The synergy of these two defects improved the rate of the rate-limiting step. Density functional theory calculations revealed that the synergistic effect of VO and VCo narrowed the gap between the Fermi energy levels and the d-band center, thereby enhancing electron mobility. Finally, excellent recyclability of CuCo2O4@NFs was confirmed through cycling experiments. The application of this material provided technical support for the efficient cracking of lignin into high-value-added chemicals and realized the effective utilization of woody biomass resources.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528644","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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Catalytic Co-oxidation of Dichloromethane and non-chlorinated VOC over HxPO4-RuOx/CeO2, Pt/HZSM-5 and dry-mixed Ru-Pt Catalysts 在 HxPO4-RuOx/CeO2、Pt/HZSM-5 和干混 Ru-Pt 催化剂上催化二氯甲烷和无氯挥发性有机化合物的协同氧化作用

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-17 DOI: 10.1016/j.apcata.2024.119980

{"title":"Catalytic Co-oxidation of Dichloromethane and non-chlorinated VOC over HxPO4-RuOx/CeO2, Pt/HZSM-5 and dry-mixed Ru-Pt Catalysts","authors":"","doi":"10.1016/j.apcata.2024.119980","DOIUrl":"10.1016/j.apcata.2024.119980","url":null,"abstract":"<div><div>Industrial flue gases contain chlorinated VOCs (CVOCs) and hydrocarbons, along with various contaminants. Although previous studies have primarily focused on the catalytic oxidation of individual VOCs, the activity of VOCs in mixtures often differs from that of individual compounds. The catalytic oxidation of dichloromethane in the presence of a second VOC (ethyl acetate, n-hexane, and toluene) was investigated using HxPO4-RuOx/CeO2, Pt/HZSM-5, and dry-mixed Pt-Ru catalysts. The dry-mixed catalyst combines the excellent dechlorination ability of HxPO4-RuOx/CeO2 with the oxidation capability of Pt/HZSM-5. A mixture of 1000 ppm toluene and 100 ppm dichloromethane is fully oxidized over the Ru-Pt catalyst at 300 °C, 30 °C lower than the T100 observed on the other two catalysts. DFT calculation reveals that the activation of toluene and dichloromethane occurs on Pt and Ru sites, respectively, dechlorinated by proton of phosphate. Furthermore, by-product dioxin content on Pt-Ru is significantly below 0.1 ng TEQ Nm−3 limit.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142528643","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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Recent progress for boosting CO2 hydrogenation to light olefins 促进二氧化碳加氢制取轻质烯烃的最新进展

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-16 DOI: 10.1016/j.apcata.2024.119982

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Metal-decorated opal-like silica catalysts: High-temperature reconstructions in cobalt-ceria active layer during simultaneous oxidation of CO and hydrocarbons 金属装饰蛋白石状二氧化硅催化剂：CO 和碳氢化合物同时氧化过程中钴-铈活性层的高温重构

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-15 DOI: 10.1016/j.apcata.2024.119981

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One-pot synthesis of porous carbon nanospheres supported CuPd alloy catalysts for the hydrogenation-dechlorination of 2,3,6-trichloropyridine 用于 2,3,6- 三氯吡啶加氢脱氯的多孔碳纳米球支撑铜钯合金催化剂的一步法合成

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-15 DOI: 10.1016/j.apcata.2024.119979

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Role of piezo-, ferro-electric and built-in electric fields in regulating the performance of photocatalysts 压电、铁电和内置电场在调节光催化剂性能方面的作用

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-12 DOI: 10.1016/j.apcata.2024.119978

{"title":"Role of piezo-, ferro-electric and built-in electric fields in regulating the performance of photocatalysts","authors":"","doi":"10.1016/j.apcata.2024.119978","DOIUrl":"10.1016/j.apcata.2024.119978","url":null,"abstract":"<div><div>Photo(electro)catalytic technologies employ renewable solar energy to address the energy crisis and mitigate environmental pollution. However, solar-energy-based applications suffer from limitations owing to low conversion efficiencies, mainly because the driving force for charge separation and transfer within photoelectrode materials is insufficient. Herein, we review the formation mechanisms of polarized electric fields in piezoelectric and ferroelectric photo(electro)catalytic materials, describe the photocatalytic properties of these materials, and discuss recent research progress. Moreover, the application of defect engineering to construct internally polarized electric fields is discussed. Constructing polarization internal fields via defect engineering is an effective method for driving charge separation and transfer in photoelectrode materials without intrinsic polarized electric fields. Reversible dipoles can be constructed by introducing defect dipoles and developing adjustable ferroelectric-like fields through the synergistic regulation of domain and grain boundaries. The mechanism of polarization in bulk materials is complicated, and controlling the induction and regulation of piezoelectric internal polarized electric fields is difficult. We aim to identify the key factors of constructed internal fields involved in the regulation of photo(electro)catalytic performance, clarify the structure-activity relationships between internal electric fields and photo(electro)catalytic characteristics, and guide the design and preparation of highly active photo(electro)catalytic materials.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553471","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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Insight into the synergistic effect between plasma and oxygen vacancy in direct oxidation of CH4 to CH3OH by molecular O2 at mild condition 在温和条件下分子 O2 将 CH4 直接氧化为 CH3OH 的过程中，等离子体与氧气空位的协同效应探析

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-11 DOI: 10.1016/j.apcata.2024.119977

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Epimerization of glucose to rare sugars using Beta zeolite-supported MoOx catalysts 使用贝塔沸石支撑的氧化 MoOx 催化剂将葡萄糖外聚为稀有糖类

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-09 DOI: 10.1016/j.apcata.2024.119976

{"title":"Epimerization of glucose to rare sugars using Beta zeolite-supported MoOx catalysts","authors":"","doi":"10.1016/j.apcata.2024.119976","DOIUrl":"10.1016/j.apcata.2024.119976","url":null,"abstract":"<div><div>Epimerization of abundant monosaccharides derived from lignocellulosic biomass offers an attractive approach for the synthesis of rare sugars. Molybdenum-based catalysts demonstrate excellent glucose-mannose epimerization performance, but most studies have neglected the synthesis of other sugar epimers and the pathways of their formation. Here, reduced Beta zeolite supported MoOx catalysts (Mo/Beta) with 1.5–10 wt% Mo loading were examined for glucose epimerization in water, specifically focusing on the formation of the rare sugars allose and altrose. The physicochemical structure and the catalytic activity of the catalyst were examined in detail, and the reaction mechanisms for the epimer formation were probed by nuclear magnetic resonance (NMR) spectroscopy. The results demonstrate that 5 wt% Mo/Beta achieved a near-equilibrium mannose yield of 30 % from glucose within 10 min at reaction temperatures below 140 °C, exhibiting a relatively low activation energy (∼67 kJ mol−1). At elevated reaction temperatures (≥ 120 °C), the rare sugars allose and altrose accumulated to combined yields of 24 % at 140 °C. An isotope labelling study using NMR spectroscopy corroborated the catalysis to involve 1,2-carbon shifts that elicit the formation of rare sugars at sufficiently high temperatures. Evaluation of catalyst reuse and regeneration indicated that supported MoOx had higher stability than MoO3, but the stability of the Mo/Beta catalysts under hydrothermal conditions leaves room for improvement.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420360","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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Catalytic oxidation of 1,2-dichlorobenzene over CoxCry oxides 在 CoxCry 氧化物上催化氧化 1,2-二氯苯

IF 4.7 2区化学

Applied Catalysis A: General Pub Date : 2024-10-06 DOI: 10.1016/j.apcata.2024.119975

{"title":"Catalytic oxidation of 1,2-dichlorobenzene over CoxCry oxides","authors":"","doi":"10.1016/j.apcata.2024.119975","DOIUrl":"10.1016/j.apcata.2024.119975","url":null,"abstract":"<div><div>CoxCry mixed oxides were synthesized to investigate the catalytic combustion of chlorinated aromatics with 1,2-dichlorobenzene (1,2-DCB) as model compound. Characterizations show Cr can exist as Cr6+Ox on Co3O4 surface or be incorporated as Cr-O-Co into Co3O4, which increases the dispersion of Co3O4. However, CrO2 appears and Co is conversely dispersed into CrO2 when Cr/Cr+Co = 0.4 or higher. Co7Cr3 shows best catalytic activity for 1,2-DCB oxidation with T90 of 288 ℃, and its 1,2,4-trichlorobenzene selectivity is below 0.06 % during whole process, much lower than Co3O4 (45 %) and Co5Cr5 (50 %). The synergism of Cr6+ and Cr-O-Co in spinel matrix contributes to the strong acidity and superior reducibility, ensuring the quick Cl removal and inhibiting the chlorination of 1,2-DCB through accelerating Deacon process, while CrO2 suffers severe Cl deposition and Cr loss. Accordingly, CoxCry catalysts with spinel structure present excellent performance and stable activity at 300 ℃ for at least 50 h.</div></div>","PeriodicalId":243,"journal":{"name":"Applied Catalysis A: General","volume":null,"pages":null},"PeriodicalIF":4.7,"publicationDate":"2024-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142420361","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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