Catalysts最新文献_第5页

Conversion of CO2 into Glycolic Acid: A Review of Main Steps and Future Challenges 将二氧化碳转化为乙醇酸：主要步骤和未来挑战综述

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-19 DOI: 10.3390/catal14010004

Marcelo Tavares Lima, Nouridine Ousseini Salifou, G. V. Brigagão, Ivaldo Itabaiana Junior, R. Wojcieszak

引用次数: 0

Electrocatalytic Hydrogen Evolution of Transition Metal (Fe, Co and Cu)–Corrole Complexes Bearing an Imidazole Group 含咪唑基团的过渡金属（铁、钴和铜）-硼醛配合物的电催化氢气进化

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-19 DOI: 10.3390/catal14010005

Ling-Wei Wu, Yan-Fang Yao, Shi-Yin Xu, Xu-You Cao, Yan-Wei Ren, Li-Ping Si, Hai Liu

引用次数: 0

Photocatalysis and Sonocatalysis for Environmental Applications: Synergy or Competition? 环境应用中的光催化和声催化：协同还是竞争？

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-19 DOI: 10.3390/catal14010002

Sergey I. Nikitenko

引用次数: 0

Synergistic Use of Thermostable Laccase and Xylanase in Optimizing the Pre-Bleaching of Kraft Pulp 热稳定性漆酶和木聚糖酶在优化牛皮纸浆预漂白中的协同作用

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-19 DOI: 10.3390/catal14010001

Kartik Patel, Nilam Vaghamshi, Kamlesh Shah, S. Duggirala, A. Ghelani, P. Dudhagara, D. Shyu

{"title":"Synergistic Use of Thermostable Laccase and Xylanase in Optimizing the Pre-Bleaching of Kraft Pulp","authors":"Kartik Patel, Nilam Vaghamshi, Kamlesh Shah, S. Duggirala, A. Ghelani, P. Dudhagara, D. Shyu","doi":"10.3390/catal14010001","DOIUrl":"https://doi.org/10.3390/catal14010001","url":null,"abstract":"The continuous requirement for pre-bleaching processes on kraft pulp, employing a range of compatible enzymes, aims to mitigate the pollution caused by chemical bleaching agents. In the present study, the laccase-producing bacterium Bacillus licheniformis BK-1 was isolated from the Bakreshwar hot spring in India and tested for laccase production using different lignocellulosic substrates. The isolate was found to produce maximum laccase (8.25 IU/mL) in the presence of rice bran as a substrate, followed by 5.14 IU/mL using sawdust over a 48 h period. Laccase production doubled when medium parameters were optimized using a central composite design. The bleaching of rice straw pulp was accomplished using a laccase, xylanase (previously extracted from the same bacteria), and laccase–xylanase mixture. The mix-wood kraft pulp treated with the enzyme mixture at pH 7.0 and 50 °C temperature for up to 180 min reduced the chlorine amount by 50% compared to the control. The results also revealed that the enzyme mixture improved the pulp’s optical (brightness 10.39%) and physical (tear index 39.77%, burst index 22.82%, and tensile strength 14.28%) properties with 50% chlorine dose. These exceptional properties underscore the enzyme mixture’s suitability for pulp pre-bleaching in paper manufacturing, offering a safer and more environmentally friendly process.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":" 15","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138960937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Stability of Ruthenium/Carbon Catalytic Materials during Operation in Carbon Monoxide Methanation Process 钌/碳催化材料在一氧化碳甲烷化过程中的稳定性

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-18 DOI: 10.3390/catal13121518

E. Truszkiewicz, Klaudia Latoszek, Milena Ojrzyńska, A. Ostrowski, L. Kępiński

{"title":"Stability of Ruthenium/Carbon Catalytic Materials during Operation in Carbon Monoxide Methanation Process","authors":"E. Truszkiewicz, Klaudia Latoszek, Milena Ojrzyńska, A. Ostrowski, L. Kępiński","doi":"10.3390/catal13121518","DOIUrl":"https://doi.org/10.3390/catal13121518","url":null,"abstract":"The stable activity of catalysts is an important characteristic, which determines their suitability for industrial applications. The purpose of this study was to investigate the stability of ruthenium systems deposited on carbon under conditions simulating long-term operation in CO methanation. Two series of Ru/carbon catalysts were prepared and studied during CO methanation in a hydrogen-rich gas stream. Two graphitized carbons substantially differing in their surface area (23 and 1457 m2/g) were used as supports, and Ru loadings of 3 and 6 wt.% were applied. The stability of Ru/C catalysts was examined in a 240 h time-on-stream test. The samples were characterized by CO chemisorption, XRD, TEM, Raman spectroscopy, TG–MS studies and CO-TPD. The stability of the catalysts over 240 h in the CO + H2 mixture depended on the support type and Ru loading. The highest CO conversion and increased activity was observed for both catalysts with Ru dispersion above 80%. The tested systems were also resistant to carbon deposition. Interestingly, a similar level of activity was obtained for 3 wt.% Ru supported on the low surface area carbon. It is presumed that the similar activity observed for systems with such different ruthenium dispersion is related to the presence of active sites of different strength and structure on the surface of both small and large Ru particles.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"121 ","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139175450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Micron-Sized Hierarchical Beta Zeolites Templated by Mesoscale Cationic Polymers as Robust Catalysts for Acylation of Anisole with Acetic Anhydride 用中尺度阳离子聚合物模板化的微米级β沸石作为乙酸酐酰化苯甲醚的强效催化剂

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-18 DOI: 10.3390/catal13121517

Songsong Miao, Shuaishuai Sun, Zhenyu Lei, Yuting Sun, Chen Zhao, Junling Zhan, Wenxiang Zhang, Mingjun Jia

{"title":"Micron-Sized Hierarchical Beta Zeolites Templated by Mesoscale Cationic Polymers as Robust Catalysts for Acylation of Anisole with Acetic Anhydride","authors":"Songsong Miao, Shuaishuai Sun, Zhenyu Lei, Yuting Sun, Chen Zhao, Junling Zhan, Wenxiang Zhang, Mingjun Jia","doi":"10.3390/catal13121517","DOIUrl":"https://doi.org/10.3390/catal13121517","url":null,"abstract":"Hierarchical Beta zeolites with interconnected intracrystalline mesopores and high structural stability are highly attractive for catalytic applications involving bulky reactants. Here, by introducing a suitable amount of polydiallyldimethylammonium chloride into the initial synthesis system, micron-sized Beta zeolite crystals with abundant hierarchical porosity (Beta-H) were hydrothermally synthesized. The sample named Beta-H_1 exhibited very high catalytic activity and durability for the Friedel–Crafts acylation of anisole with acetic anhydride. A 92% conversion rate of acetic anhydride could be achieved after 1 h of reaction in a fixed bed reactor, and 71% conversion still remained after 10 h, much better than the rate for conventional Beta zeolite (which decreased rapidly from 85% to 37% within 10 h). The enhanced catalytic performance of Beta-H zeolites could be mainly attributed to the relatively lower strong acid density and the faster transport rate of the hierarchical zeolites. In addition, Beta-H showed high structural stability and could be easily regenerated via high-temperature calcination without obvious loss in catalytic activity, demonstrating its great potential for catalytic applications in the industrially important Friedel–Crafts acylation process.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"229 4","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138995094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Structural and Physicochemical Properties of ZrO2-SiO2 Monolithic Catalysts with Hierarchical Pore Structure: Effect of Zirconium Precursor 洞察具有分层孔结构的 ZrO2-SiO2 整体催化剂的结构和物理化学特性：锆前驱体的影响

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-16 DOI: 10.3390/catal13121516

Katarzyna Maresz, A. Ciemięga, P. Bezkosty, Kamil Kornaus, Maciej Sitarz, M. Krzywiecki, J. Mrowiec-Białoń

{"title":"Insight into Structural and Physicochemical Properties of ZrO2-SiO2 Monolithic Catalysts with Hierarchical Pore Structure: Effect of Zirconium Precursor","authors":"Katarzyna Maresz, A. Ciemięga, P. Bezkosty, Kamil Kornaus, Maciej Sitarz, M. Krzywiecki, J. Mrowiec-Białoń","doi":"10.3390/catal13121516","DOIUrl":"https://doi.org/10.3390/catal13121516","url":null,"abstract":"Zirconia–silica monolithic catalysts with hierarchical micro/macroporous structure were obtained in a sol-gel process combined with phase separation using inorganic salts, i.e., oxychloride, oxynitrate and sulphate, as a zirconium source. It was found that the use of zirconium oxychloride and prehydrolysis of tetraethoxysilane (TEOS) resulted in materials characterized by a well-developed continuous structure of macropores with a diameter of ca. 10 μm. For zirconium oxynitrate and sulfate modified materials, the prehydrolysis hardly affected the macropore size. The micropores with a diameter of 1.5 nm in the skeleton of all materials provided a large surface area of 550–590 m2/g. A high dispersion of zirconia in the silica skeleton in all studied materials was shown. However, the largest surface concentration of Lewis and Brönsted acid sites was found in the monolith synthesized with zirconium oxychloride. The monoliths were used as a core for continuous-flow microreactors and high catalytic activity was confirmed in the deacetalization of benzylaldehyde dimethyl acetal. The process was characterized by a high efficiency at low temperature, i.e., 35 °C.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"18 4","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138967469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Evaluation of Ecological Parameters of a Compression Ignition Engine Fueled by Diesel Oil with an Eco Fuel Shot Liquid Catalyst 使用生态燃料喷射液体催化剂的柴油压燃发动机生态参数评估

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-15 DOI: 10.3390/catal13121513

T. Osipowicz, A. Koniuszy, Viktar Taustyka, K. Abramek, Ł. Mozga

引用次数: 0

Novel In Vitro Multienzyme Cascade for Efficient Synthesis of d-Tagatose from Sucrose 从蔗糖高效合成 d-塔格糖的新型体外多酶级联法

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-15 DOI: 10.3390/catal13121515

Shuangyu Liu, Wenyu Tu, Ye Ni, Yuanyi Guo, Ruizhi Han

引用次数: 0

Heterogeneous Catalysts for Carbon Dioxide Methanation: A View on Catalytic Performance 用于二氧化碳甲烷化的异构催化剂：催化性能展望