Reaction Chemistry & Engineering最新文献_第10页

Role of powders and coatings for relating catalytic activity and structure of Pt in emission control catalysis† 粉末和涂层对Pt在排放控制催化中的相关活性和结构的作用

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-24 DOI: 10.1039/D4RE00262H

Samuel Struzek, Tim Delrieux, Florian Maurer, Danielle Santos Gonçalves, Sarina-Lena Heck, Linda Klag, Joachim Czechowsky, Anna Zimina and Jan-Dierk Grunwaldt

{"title":"Role of powders and coatings for relating catalytic activity and structure of Pt in emission control catalysis†","authors":"Samuel Struzek, Tim Delrieux, Florian Maurer, Danielle Santos Gonçalves, Sarina-Lena Heck, Linda Klag, Joachim Czechowsky, Anna Zimina and Jan-Dierk Grunwaldt","doi":"10.1039/D4RE00262H","DOIUrl":"https://doi.org/10.1039/D4RE00262H","url":null,"abstract":"Packed powder beds and coatings are two relevant forms of catalysts, applied in industrial heterogeneous catalysis and multiple fundamental studies including operando spectroscopy. Both types have their individual advantages and disadvantages in regard to the performance and characterisation causing some complexity in the resulting flow patterns, possible temperature inhomogeneities in the reactor and the dynamic evolution of chemical state of the noble metal during the reaction along the catalytic bed. The well-known CO oxidation reaction over Pt/Al2O3 catalysts was used in this study to uncover the influence of the gas phase compositions and the temperature on the evolution of the electronic structure of Pt for powdered and coated catalysts at comparable length scales. Advanced operando investigations were used to demonstrate the influence of spatial gradients in the gas phase for washcoats in contrast to packed powder beds. Additionally, transient gradients in the chemical state of Pt, which occurred more pronounced for packed powder beds than for coated monoliths were followed and traced back to heat and mass transfer effects. Finally, the catalytic activity can be linked to the temperature distributions for both types of samples. These findings will be valuable for planning and evaluating future combinations of spectroscopic and catalytic experiments on industrially relevant systems.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 6","pages":" 1233-1243"},"PeriodicalIF":3.4,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/re/d4re00262h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Selective photocatalytic oxidation of (hetero)aryl alcohols to aldehydes and ketones by visible-light-absorbing three-dimensional Ni/ZnO nanoparticles† 可见光吸收三维Ni/ZnO纳米颗粒†选择性光催化氧化（杂）芳醇生成醛和酮

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-21 DOI: 10.1039/D5RE00035A

Zahra Bazyar, Fatemeh Zeraatpisheh and Nastaran Moalemiyan

引用次数: 0

Amphiphobic surface-active ionic liquids as dynamic micellar phase-transfer catalysts for biphasic epoxidations† 两疏表面活性离子液体作为两相环氧化的胶束相转移催化剂

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-20 DOI: 10.1039/D4RE00616J

Johannes Luibl, Markus Hegelmann, Stephan Schwarzinger, Wolfgang Korth, Mirza Cokoja and Andreas Jess

{"title":"Amphiphobic surface-active ionic liquids as dynamic micellar phase-transfer catalysts for biphasic epoxidations†","authors":"Johannes Luibl, Markus Hegelmann, Stephan Schwarzinger, Wolfgang Korth, Mirza Cokoja and Andreas Jess","doi":"10.1039/D4RE00616J","DOIUrl":"https://doi.org/10.1039/D4RE00616J","url":null,"abstract":"We report on the synthesis of amphiphobic surface-active ionic liquids (FSAILs) containing fluorinated anions. The solubility and aggregation behavior of the FSAILs was determined in both aqueous hydrogen peroxide and in organic media. The FSAILs were applied as temperature-controlled micellar and phase transfer epoxidation catalysts by mixing the FSAIL with sodium tungstate in aqueous H2O2 solution. The epoxidation of cis-cyclooctene with aqueous hydrogen peroxide was studied in terms of catalyst activity, phase behavior and recycling. To deepen insights recycability and phase transfer, especially of the catalytically active species, characteristics of the micellar catalysis were investigated in detail over different reaction time periods. High-resolution 1H-qNMR reveals a quantitative phase transfer of the FSAILs into the organic phase, while the additive remains in the aqueous phase. Additionally, the present tungsten species also remain fully in the aqueous phase as shown by ICP-MS analysis.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 6","pages":" 1350-1358"},"PeriodicalIF":3.4,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/re/d4re00616j?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Iron-loaded pure silica -SVR zeolite for the hydroxylation of phenol† 载铁纯二氧化硅-SVR沸石对苯酚†的羟基化反应

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-19 DOI: 10.1039/D5RE00013K

Wenwen Song, Haodong Xie, Li Liu, Xiang Ni, Yuan Xue, Yan Liu, Junwen Chen, Lei Wang and Hongjun Zhu

{"title":"Iron-loaded pure silica -SVR zeolite for the hydroxylation of phenol†","authors":"Wenwen Song, Haodong Xie, Li Liu, Xiang Ni, Yuan Xue, Yan Liu, Junwen Chen, Lei Wang and Hongjun Zhu","doi":"10.1039/D5RE00013K","DOIUrl":"https://doi.org/10.1039/D5RE00013K","url":null,"abstract":"Dihydroxybenzene compounds are a type of crucial fine chemicals used in daily life, but their production process is severely constrained by contamination and relatively low efficiency. In this work, the iron-containing pure silica -SVR zeolite was successfully developed and proven to be an efficient catalyst in the conversion of phenol into dihydroxybenzene compounds in a green way. Notably, in the presence of hydroperoxide, the heterogeneous-mediated oxidative process achieved a record-high conversion of 37% and selectivity of 99%. Combining physicochemical analysis and multiple spectroscopic techniques, the active species was confirmed to be the trivalent iron sites confined within the -SVR voids. Moreover, the accessible ordered silanol defects confined within the -SVR channel system are abundant, providing anchor points for grafting iron sites. The highly active iron species initiates the free radical-mediated reaction pathway, significantly facilitating the oxidative reaction process. As unveiled by the catalytic kinetics, the iron-containing zeotype catalyst affords a TON of 861 and TOF of 430.5 h−1, and the apparent active energy Ea was determined as 26 kJ mol−1. Overall, these results not only provide a highly effective heterogeneous catalyst for the conversion of phenol into dihydroxybenzene compounds in an eco-friendly manner but also open up new horizons for the effective utilization of pure silica zeolites listed in the IZA database.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 6","pages":" 1259-1267"},"PeriodicalIF":3.4,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148239","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

Efficient one-pot hydrogenation and acetylation of 4-nitrophenol for selective synthesis of 4-aminophenol and paracetamol with a reusable Ni catalyst† 可重复使用镍催化剂†催化4-硝基苯酚一锅加氢和乙酰化选择性合成4-氨基苯酚和扑热息痛

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-19 DOI: 10.1039/D5RE00016E

Ziliang Yuan, Xi Wang, Yuxin Liu, Peng Zhou, Renjie Huang, Jie Lv, Yimeng Yang, Yanrong Ren, Zehui Zhang and Bing Liu

引用次数: 0

Rapid preparation of waterborne polyurethane dispersions using continuous-flow microreaction technology† 用连续流微反应技术快速制备水性聚氨酯分散体

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-18 DOI: 10.1039/D5RE00015G

Wenjun Huang, Xuanyu Chen, Qianjiang Lv, Xiaolan Cai, Wei Tan and Yanxiong Fang

{"title":"Rapid preparation of waterborne polyurethane dispersions using continuous-flow microreaction technology†","authors":"Wenjun Huang, Xuanyu Chen, Qianjiang Lv, Xiaolan Cai, Wei Tan and Yanxiong Fang","doi":"10.1039/D5RE00015G","DOIUrl":"https://doi.org/10.1039/D5RE00015G","url":null,"abstract":"This paper provides a strategy for the preparation of waterborne polyurethane (WPU) dispersions by continuous-flow microreaction technology. The strategy starts with the preparation of polyurethane prepolymers in a continuous-flow reactor, followed by emulsification and post-chain expansion reaction in a high-speed disperser to produce M-WPU. Compared with B-WPU preparation in a traditional batch reactor, the continuous-flow microreaction technology can shorten the polymerization time from several hours to several minutes, which greatly improves the production efficiency. Meanwhile, the optimal process conditions were determined by investigating the effects of solvent dosage, catalyst type and dosage, reaction temperature, reaction residence time, total flow rate, and reactor configuration on the extent of reaction of polyurethane prepolymers as well as the effects of neutralization residence time and neutralization temperature on the particle size of WPU. Finally, the films of M-WPU and B-WPU were characterized and tested, and it was found that the M-WPU film exhibited higher molecular weight, tensile strength, hardness, larger water contact angle, better heat resistance, and lower water absorption compared with the B-WPU film prepared by the traditional batch process. This suggests that the continuous-flow microreactor process provides an efficient and promising method for the preparation of WPU.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 6","pages":" 1326-1336"},"PeriodicalIF":3.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148244","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

Oxygen vacancy-enriched MOF-derived Mn2O3 catalysts for high-efficiency direct synthesis of ethylene urea from CO2† 富氧空位mof衍生的Mn2O3催化剂用于CO2直接高效合成尿素乙酯

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-18 DOI: 10.1039/D5RE00061K

Fei Wang, Yulong Jin, Yue Zhang, Xuan Liang, Zihao Tong, Xuejiao Wei, Yihu Ke, Jie Xu and Bing Xue

{"title":"Oxygen vacancy-enriched MOF-derived Mn2O3 catalysts for high-efficiency direct synthesis of ethylene urea from CO2†","authors":"Fei Wang, Yulong Jin, Yue Zhang, Xuan Liang, Zihao Tong, Xuejiao Wei, Yihu Ke, Jie Xu and Bing Xue","doi":"10.1039/D5RE00061K","DOIUrl":"https://doi.org/10.1039/D5RE00061K","url":null,"abstract":"The direct reaction of CO2 with ethylene diamine (EDA) to produce ethylene urea (EU) provides significant potential for the resourceful utilization of CO2. Herein, we systematically synthesized a series of Mn2O3 catalysts by pyrolyzing the corresponding metal–organic framework (MOF) precursor with different calcination temperatures to evaluate their catalytic activity in the synthesis of EU from CO2. Among them, MnBDC-400 exhibited the highest reactivity for EU formation, which reached 96% EDA conversion and 98% EU selectivity, even at a lower temperature (120 °C). This result was superior to all previously reported catalysts. The excellent activity benefited from more surface oxygen vacancies and Mn3+ species on the surface of MnBDC-400, which facilitated the formation of ethylenediamine carbamate (EDA-CA) intermediates, leading to improved EU yields. This work has a certain guiding significance for the preparation of highly active MOF-derived oxide catalysts for CO2 conversion.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 6","pages":" 1399-1407"},"PeriodicalIF":3.4,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148247","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

Efficient selective hydrogenation of benzonitrile over TiO2-supported nickel catalysts† 二氧化钛负载镍催化剂上苯腈的高效选择性加氢研究

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-17 DOI: 10.1039/D5RE00024F

Yinkun Li, Dongxue Wang, Xixi Liu, Guoqiang She, Peng Zhou, Yanxi Zhao, Zehui Zhang and Bing Liu

引用次数: 0

Open-source fraction collector for flash column chromatography and continuous flow reactions† 开源馏分收集器的闪蒸柱色谱和连续流动反应†

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-14 DOI: 10.1039/D5RE00070J

Yuesu Chen, Cassian Desmons, Martin Cattoen and Jean-Christophe M. Monbaliu

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Is it reliable to determine the stoichiometry of extraction complexes using the classic slope analysis model in acidic extraction systems?† 在酸性萃取系统中，用经典的斜率分析模型来确定萃取物的化学计量是否可靠？__

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-03-14 DOI: 10.1039/D4RE00596A

Qi Zhao, Shuai Wang and Kaimin Shih

引用次数: 0