Catalysts最新文献_第4页

Measurements of Dioxygen Formation in Catalytic Electrochemical Water Splitting 测量催化电化学水分离过程中的二氧生成量

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-22 DOI: 10.3390/catal14010013

C. Tiwari, Y. Geletii

引用次数: 0

Ca2Fe2O5-Based WGS Catalysts to Enhance the H2 Yield of Producer Gases 基于 Ca2Fe2O5 的 WGS 催化剂提高生产气体的 H2 产率

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-21 DOI: 10.3390/catal14010012

I. Antunes, L. Ruivo, L. Tarelho, Jorge R. Frade

{"title":"Ca2Fe2O5-Based WGS Catalysts to Enhance the H2 Yield of Producer Gases","authors":"I. Antunes, L. Ruivo, L. Tarelho, Jorge R. Frade","doi":"10.3390/catal14010012","DOIUrl":"https://doi.org/10.3390/catal14010012","url":null,"abstract":"Ca2Fe2O5-based catalysts were synthesized from siderite and calcite precursors, which were processed in the form of pelletized samples and tested as water gas shift catalysts. Catalytic tests were performed in a tubular reactor, at temperatures in the range 400–500 °C and with different H2O:CO ratios, diluted with N2; this demonstrates the positive impact of Ca2Fe2O5 on conversion of CO and H2 yield, relative to corresponding tests without catalyst. The catalytic performance was also remarkably boosted in a microwave-heated reactor, relative to conventional electric heating. Post-mortem analysis of spent catalysts showed significant XRD reflections of spinel phases (Fe3O4 and CaFe2O4), and SiO2 from the siderite precursor. Traces of calcium carbonate were also identified, and FTIR analysis revealed relevant bands ascribed to calcium carbonate and adsorbed CO2. Thermodynamic modelling was performed to assess the redox tolerance of Ca2Fe2O5-based catalysts in conditions expected for gasification of biomass and thermochemical conditions at somewhat lower temperatures (≤500 °C), as a guideline for suitable conditions for water gas shift. This modelling, combined with the results of catalytic tests and post-mortem analysis of spent catalysts, indicated that the O2 and CO2 storage ability of Ca2Fe2O5 contributes to its catalytic activity, suggesting prospects to enhance the H2 content of producer gases by water gas shift.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"38 20","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138948789","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

Optimization of an Open-Cell Foam-Based Ni-Mg-Al Catalyst for Enhanced CO2 Hydrogenation to Methane 优化开孔泡沫型 Ni-Mg-Al 催化剂，促进二氧化碳加氢制甲烷

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-21 DOI: 10.3390/catal14010011

Paulina Summa, M. Motak, P. Da Costa

引用次数: 0

Enhanced Low-Temperature Activity and Hydrothermal Stability of Ce-Mn Oxide-Modified Cu-SSZ-39 Catalysts for NH3-SCR of NOx 增强用于氮氧化物 NH3-SCR 的 Ce-Mn Oxide 改性 Cu-SSZ-39 催化剂的低温活性和水热稳定性

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-21 DOI: 10.3390/catal14010010

Ahui Tang, Fuzhen Yang, Ying Xin, Xiaoli Zhu, Long Yu, Shuai Liu, Dongxu Han, Junxiu Jia, Yaning Lu, Zhenguo Li, Zhaoliang Zhang

{"title":"Enhanced Low-Temperature Activity and Hydrothermal Stability of Ce-Mn Oxide-Modified Cu-SSZ-39 Catalysts for NH3-SCR of NOx","authors":"Ahui Tang, Fuzhen Yang, Ying Xin, Xiaoli Zhu, Long Yu, Shuai Liu, Dongxu Han, Junxiu Jia, Yaning Lu, Zhenguo Li, Zhaoliang Zhang","doi":"10.3390/catal14010010","DOIUrl":"https://doi.org/10.3390/catal14010010","url":null,"abstract":"Cu-SSZ-39 zeolite with an AEI structure exhibits excellent hydrothermal stability and can be a potential alternative to Cu-SSZ-13 zeolite SCR catalysts for NOx removal in diesel vehicles. However, the inferior low-temperature performance of Cu-SSZ-39 leads to substantial NOx emissions during the cold-start period, impeding its practical application. In this study, Ce-Mn oxide-modified Cu-SSZ-39 catalysts (CeMnOx/Cu-SSZ-39) and references (CeO2/Cu-SSZ-39 and MnOx/Cu-SSZ-39) were prepared by the ion-exchange of Cu ions followed by impregnation of the oxide precursors, with the aim of enhancing the NH3-SCR performance at low temperatures. The modified catalysts exhibited improved low-temperature activity and hydrothermal stability compared to the unmodified counterpart. In particular, CeMnOx/Cu-SSZ-39 showed the highest activity among the three catalysts and achieved NOx conversions above 90% within the temperature range of 180 °C to 600 °C, even after undergoing hydrothermal aging at 800 °C. Experimental results indicated that the synergistic effect between Ce and Mn in CeMnOx improves the redox properties and acidity of the catalyst due to the presence of Ce3+, Mn4+, and abundant adsorbed oxygen species, which facilitate low-temperature SCR reactions. Furthermore, the interaction of CeMnOx with Cu-SSZ-39 stabilizes the zeolite framework and hinders the agglomeration of Cu species during the hydrothermal aging process, contributing to its exceptional hydrothermal stability. The kinetics and NO oxidation experiments demonstrated that CeMnOx provides access to fast SCR reaction pathways by oxidizing NO to NO2, resulting in a significant increase in low-temperature activity. This study provides novel guidelines for the design and preparation of Cu-SSZ-39 zeolite with outstanding SCR performance over a wide temperature range.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"38 25","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138950154","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

Density Functional Theory Study of CuAg Bimetal Electrocatalyst for CO2RR to Produce CH3OH 用于 CO2RR 生成 CH3OH 的铜银双金属电催化剂的密度泛函理论研究

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-20 DOI: 10.3390/catal14010007

Sensen Xue, Xingyou Liang, Qing Zhang, Xuefeng Ren, Liguo Gao, Tingli Ma, Anmin Liu

引用次数: 0

Dimension Engineering in Noble-Metal-Based Nanocatalysts 贵金属基纳米催化剂的尺寸工程学

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-20 DOI: 10.3390/catal14010009

Bei Liu, Haosen Yang, Pengfei Hu, Guangsheng Wang, Yongqiang Guo, Hewei Zhao

引用次数: 0

Optimizing Graphene Dopants for Direct Electrocatalytic Quantification of Small Molecules and Ions 优化石墨烯掺杂剂，实现小分子和离子的直接电催化定量

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-20 DOI: 10.3390/catal14010008

Qingwei Zhou, Mingjiao Shi, Mengfan Wu, Ningbin Zhao, Peizheng Shi, Yangguang Zhu, Aiwu Wang, Chen Ye, Cheng-Te Lin, Li Fu

引用次数: 0

Nitrogen-Rich Tetrazole–Amide-Functionalised Zn Metal–Organic Framework as Catalyst for Efficient Catalytic CO2 Cycloaddition with Epoxides 富氮四唑-酰胺官能化 Zn 金属有机框架作为催化剂高效催化 CO2 与环氧化物的环加成反应

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-20 DOI: 10.3390/catal14010006

Anup Paul, Ismayil M. Garazade, Anirban Karmakar, R. A. Khan, M. F. C. Guedes da Silva, Ana V M Nunes, A. Pombeiro

{"title":"Nitrogen-Rich Tetrazole–Amide-Functionalised Zn Metal–Organic Framework as Catalyst for Efficient Catalytic CO2 Cycloaddition with Epoxides","authors":"Anup Paul, Ismayil M. Garazade, Anirban Karmakar, R. A. Khan, M. F. C. Guedes da Silva, Ana V M Nunes, A. Pombeiro","doi":"10.3390/catal14010006","DOIUrl":"https://doi.org/10.3390/catal14010006","url":null,"abstract":"In this study, we report the design, synthesis, and catalytic application of the novel nitrogen-rich Zn(II) MOF [Zn2(μ3-1κN,2κN′,3κO-HL)2(DMF)2]n·nH2O (HL2− = 4-((4-(1H-tetrazol-5-yl)phenyl)carbamoyl)benzoate), denoted as ZnMOF, for the efficient conversion of carbon dioxide (CO2) to cyclic carbonates via cycloaddition with epoxides. It was synthesised from a tetrazole appended amide-functionalised pro-ligand (H3L) and Zn(NO3)2·6H2O under hydrothermal conditions. The synthesised material was characterised namely by elemental analysis, infrared spectroscopy, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction analyses. The catalytic potential of ZnMOF was investigated in the CO2 cycloaddition reaction with various epoxides, with conversions ranging from 17% to 99%. The catalyst retained its activity across multiple reaction cycles, demonstrating its stability and reusability. The influence of co-catalysts on the reaction was explored, with tetrabutylammonium bromide (TBABr) emerging as the most effective one. A plausible reaction mechanism is proposed.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":"91 11","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138954379","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

Highly Efficient and Magnetically Recyclable Non-Noble Metal Fly Ash-Based Catalysts for 4-Nitrophenol Reduction 基于磁性可回收非贵金属粉煤灰的高效 4-硝基苯酚还原催化剂

IF 3.9 3区化学

Catalysts Pub Date : 2023-12-19 DOI: 10.3390/catal14010003

I. Kuźniarska-Biernacka, Inês Ferreira, Marta Monteiro, A. C. Santos, Bruno Valentim, Alexandra Guedes, João H. Belo, João P. Araújo, Cristina Freire, A. F. Peixoto

{"title":"Highly Efficient and Magnetically Recyclable Non-Noble Metal Fly Ash-Based Catalysts for 4-Nitrophenol Reduction","authors":"I. Kuźniarska-Biernacka, Inês Ferreira, Marta Monteiro, A. C. Santos, Bruno Valentim, Alexandra Guedes, João H. Belo, João P. Araújo, Cristina Freire, A. F. Peixoto","doi":"10.3390/catal14010003","DOIUrl":"https://doi.org/10.3390/catal14010003","url":null,"abstract":"4-nitrophenol (4-NPh) is a harmful compound produced in large amounts in the chemical industry, and its reduction to aminophenol (4-APh) using noble metals as catalysts is one of the most studied processes. The development of noble metal-free catalysts represents an economic advantage in large-scale applications and contributes to the sustainability of raw materials. Coal fly ash (FA), a major waste stream from coal combustion, contains an easily recoverable magnetic fraction (FAmag sample) composed of Fe-rich particles that could substitute noble metal catalysts in 4-NPh reduction, with the concomitant advantage of being easily recovered via magnetic separation. For this purpose, a new composite material containing copper ferrite nanoparticles (FAmag@CS@CuFe) was prepared via a facile, environmentally friendly and cost-effective method based on three components: FAmag as the core, a biobased polymer chitosan (CS) as the linker and copper ferrite CuFe2O4 nanoparticles (CuFe) as the active sites. The structure, morphology, composition and magnetic properties of the FAmag@CS@CuFe material were studied to assess the efficiency of the preparation. It was found that the biopolymer prevented the aggregation of CuFe nanoparticles and enabled a synergistically outstanding activity towards the reduction of 4-NPh in comparison to the pristine FAmag and bare CuFe nanoparticles. The FAmag@CS@CuFe catalyst showed efficiency and stability in the conversion of 4-NPh of up to 95% in 3 min over four consecutive cycles. Such remarkable catalytic results demonstrate the potential of this catalyst as a substitute for expensive noble metals.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":" 76","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138962225","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

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