Reaction Chemistry & Engineering最新文献_第8页

Depolymerization of polydimethylsiloxanes in ammonia – a new approach to silicone recycling† 聚二甲基硅氧烷在氨中解聚——有机硅回收的新途径

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-17 DOI: 10.1039/D4RE00566J

E. O. Minyaylo, A. I. Kudryavtseva, M. N. Temnikov, A. S. Peregudov, A. A. Anisimov and A. M. Muzafarov

引用次数: 0

Revelation of the photoexcitation mechanism of COF-DFB materials based on first principles 基于第一性原理的COF-DFB材料光激发机理的揭示

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-17 DOI: 10.1039/D4RE00492B

Huanjun Su, Yumeng Zhang, Weili Shi, Haoyang Shi, Yani Liu and Ying Lin

{"title":"Revelation of the photoexcitation mechanism of COF-DFB materials based on first principles","authors":"Huanjun Su, Yumeng Zhang, Weili Shi, Haoyang Shi, Yani Liu and Ying Lin","doi":"10.1039/D4RE00492B","DOIUrl":"https://doi.org/10.1039/D4RE00492B","url":null,"abstract":"A two-dimensional covalent organic framework (COF) material successfully prepared in the experiment exhibits good light absorption performance, but its internal mechanism is still unclear. A deep understanding of the excitation mechanism of COF materials is of great significance for the preparation and modification of two-dimensional materials. First, the geometric structure of COF-DFB was determined using first-principles and quantum chemical methods, revealing a pore size of 11.62 Å. Secondly, the electron–hole distribution of each excited state of COF-DFB with an oscillator strength greater than 0.1 was further analyzed. It was found that in most excited states of COF-DFB, the electrons are mainly distributed on the TMBP monomer, while the holes are concentrated between TMBP (2,2′,6,6′-tetramethyl-4,4′-bipyridine) and DFB (1,4-diformylbenzene). Finally, the UV-visible spectrum of COF-DFB shows that its maximum absorption wavelength is 413.8 nm. These results indicate that COF-DFB possesses excellent photoelectric properties and demonstrates significant application potential in the field of photocatalysis.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 5","pages":" 999-1006"},"PeriodicalIF":3.4,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143888496","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}

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Energetical analysis of a method for the scale-up of a microwave flow P-esterification by recirculation† 微波流动p -酯化再循环放大方法的能量分析

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-17 DOI: 10.1039/D4RE00622D

József Schindler, István Greiner and György Keglevich

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Immobilized laccase of Galactomyces geotrichum on modified bentonite and its use in the bioremediation of olive mill wastewater† 改性膨润土固定化土工半乳菌漆酶及其在橄榄厂废水生物修复中的应用

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-16 DOI: 10.1039/D4RE00470A

Khadijeh Pourkhanali and Gholam Khayati

{"title":"Immobilized laccase of Galactomyces geotrichum on modified bentonite and its use in the bioremediation of olive mill wastewater†","authors":"Khadijeh Pourkhanali and Gholam Khayati","doi":"10.1039/D4RE00470A","DOIUrl":"https://doi.org/10.1039/D4RE00470A","url":null,"abstract":"This work investigates the immobilization of laccase obtained from Galactomyces geotrichum onto modified bentonites. The structures of the composites were examined using SEM, FTIR, and BET techniques. Biocatalysts were evaluated in terms of activity, stability and kinetic parameters. Among the immobilized laccases, GDU-bent-lac exhibited the highest efficacy in operational (96% after 10 cycles), thermal (61% within 24 h at 65 °C), and storage (79.69% for 30 days) stabilities. Results suggested that the Langmuir model better correlated with the obtained data than the Freundlich isotherm. Results of the biodegradability study indicated that the increase in the biodegradability index of olive mill wastewater was remarkable when CTAB-bent-lac was used. Additionally, the bulk increase in the biodegradability was related to the support before laccase immobilization (0.43), and moreover, immobilization enhanced the biodegradability to some extent (0.46). In this research, a strong laccase-producing microorganism that was isolated from olive mill wastewater was used for the bioremediation of the same wastewater. To the best of our knowledge, the immobilization of laccase produced by G. geotrichum, isolated from OMW, onto modified bentonites has not been published earlier. Furthermore, the feasibility of using immobilized laccase to increase the biodegradability of OMW was investigated for the first time.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 825-838"},"PeriodicalIF":3.4,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698429","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

Identifying the ideal thermodynamics of non-stoichiometric oxygen-carrier materials for chemical looping water-gas shift† 确定非化学计量载氧材料的理想热力学用于化学环水气移位†

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-15 DOI: 10.1039/D4RE00454J

M. Selim Ungut, Ian S. Metcalfe and Wenting Hu

{"title":"Identifying the ideal thermodynamics of non-stoichiometric oxygen-carrier materials for chemical looping water-gas shift†","authors":"M. Selim Ungut, Ian S. Metcalfe and Wenting Hu","doi":"10.1039/D4RE00454J","DOIUrl":"https://doi.org/10.1039/D4RE00454J","url":null,"abstract":"With the growth in importance of H2 both industrially and as a potential energy vector along the pathway to achieving future environmental sustainability, there is an increasing need for cleaner and more efficient methods of H2 production. One promising short-term solution is to perform the water-gas shift reaction for H2 production in a chemical looping reactor to produce separate H2 and CO2 streams, thereby reducing equipment size and the cost of downstream CO2 separation. Non-stoichiometric perovskite oxides have been identified as promising oxygen carrier materials (OCMs) for the chemical looping water-gas shift (CLWGS) process as they can be engineered to allow rapid oxygen uptake kinetics, and also benefit from a thermodynamic advantage allowing higher conversions than that of conventional mixed feed reactor systems at the same temperature. The relationship between the oxygen non-stoichiometry of the solid OCM and the equilibrium oxygen partial pressure of the gas phase streams plays an important role in determining the gas conversions and usable oxygen capacity of the OCM. In this work, an optimal relationship between the two material properties in a thermodynamically limited system is proposed, and an equilibrium packed-bed reactor model is used for validation. The effect on conversions was investigated by varying the thermodynamics of the non-stoichiometric material relative to the proposed optimal case. More generally, an analogue of the pinch analysis can be used to analyse chemical looping water-gas shift reactions and similar processes.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 800-809"},"PeriodicalIF":3.4,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/re/d4re00454j?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698427","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

Crystal facet engineering of metal oxides for upgrading biomass-derived oxygenates: a perspective 金属氧化物的晶面工程升级生物质衍生的含氧化合物：一个前景

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-13 DOI: 10.1039/D4RE00562G

Zihao Liu, Yonghua Guo, Qingfeng Ge and Xinli Zhu

{"title":"Crystal facet engineering of metal oxides for upgrading biomass-derived oxygenates: a perspective","authors":"Zihao Liu, Yonghua Guo, Qingfeng Ge and Xinli Zhu","doi":"10.1039/D4RE00562G","DOIUrl":"https://doi.org/10.1039/D4RE00562G","url":null,"abstract":"Coordinatively unsaturated metal cations and oxygen anions on the surface of amphoteric metal oxides serve as acid and base centers, respectively, enabling a number of acid/base-catalyzed reactions. In particular, the O atom of oxygenates can readily coordinate with surface metal cations and can therefore initiate various reactions that are important for upgrading biomass-derived oxygenates. Metal oxide catalysts prepared via conventional methods expose various facets with distinct properties, making it difficult to elucidate the reaction chemistry and mechanism mediated on metal oxides at an atomic level. Advances in synthesis of nanocrystals of metal oxides with predominantly exposing a certain facet allow one to explore the reaction chemistry on well-defined metal oxide facets under real reaction conditions and thus may provide a powerful approach to investigate the facet-dependent structure–activity relationships of metal oxide-mediated reactions. In this perspective, we first elaborated on the fine structure and properties of various facets of TiO2 and CeO2 and then surveyed the dehydration/dehydrogenation of alcohols, ketonization of carboxylic acids, and aldol condensation of ketones and aldehydes mediated by metal oxides. In particular, we discussed the relationship between catalytic performances and the facet-dependent acid–base property and fine surface geometrical structure. Finally, we described challenges and opportunities associated with future research on metal oxide-mediated reactions via crystal facet engineering.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 750-767"},"PeriodicalIF":3.4,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698422","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

Selenium-modified microgels as interfacial catalysts for the heterophase oxidation of aromatic aldehydes† 硒修饰微凝胶作为界面催化剂在芳香醛异相氧化中的应用

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-10 DOI: 10.1039/D4RE00516C

Anastasiia Pavliuk, Oliver Fiukowski, Jan Wagner, Tetiana Kharandiuk, Volodymyr Ivasiv, Roman Nebesnyi, Uwe Schnakenberg and Andrij Pich

{"title":"Selenium-modified microgels as interfacial catalysts for the heterophase oxidation of aromatic aldehydes†","authors":"Anastasiia Pavliuk, Oliver Fiukowski, Jan Wagner, Tetiana Kharandiuk, Volodymyr Ivasiv, Roman Nebesnyi, Uwe Schnakenberg and Andrij Pich","doi":"10.1039/D4RE00516C","DOIUrl":"https://doi.org/10.1039/D4RE00516C","url":null,"abstract":"The use of selenium-modified microgels as interfacial catalysts offers a promising solution for the efficient and environmentally friendly oxidation of aromatic aldehydes. Our study highlights the use of mild reaction conditions (30–50 °C) and hydrogen peroxide as a green oxidant, taking advantage of a heterophase reaction system for the ease of product separation. The effectiveness of this system is demonstrated by the high yield of benzoic acid (95.6% with a selectivity of 96.6%) achieved in a toluene/water system at 50 °C and 8 hours reaction time. The versatility of this catalytic system is further highlighted by its successful application to various aldehydes – anisaldehyde (28.5% yield of anisic acid and 35.2% yield of mequinol), cinnamaldehyde (29.8% yield of cinnamic acid and 9.8% yield of hydrocoumarin), and veratraldehyde (39.0% yield of 3,4-dimethoxyphenol). Notably, the selenium-modified microgels exhibit excellent surfactant properties and interfacial catalytic activity in diverse heterophase organic/water solvent systems, such as chloroform/water (70.9% yield of benzoic acid), ethyl acetate/water (53.6% yield of benzoic acid), and 1-octanol/water (25.5% yield of benzoic acid and 23.3% yield of octylbenzoate). This adaptability expands the potential applications of these microgel catalysts. Moreover, the ease of catalyst recovery and good reusability of the microgel catalysts were confirmed over multiple reaction cycles, making them an attractive alternative for sustainable synthesis of aromatic acids and other oxidation processes.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 782-789"},"PeriodicalIF":3.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698425","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

Rapid synthesis of uniform silicalite-1 zeolite via a micro-liquid film reactor-assisted approach† 微液膜反应器辅助快速合成均匀硅-1沸石

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-10 DOI: 10.1039/D4RE00556B

Jindong Ji, Hetong Wang, Guoli Fan, Minghao Zhao and Feng Li

{"title":"Rapid synthesis of uniform silicalite-1 zeolite via a micro-liquid film reactor-assisted approach†","authors":"Jindong Ji, Hetong Wang, Guoli Fan, Minghao Zhao and Feng Li","doi":"10.1039/D4RE00556B","DOIUrl":"https://doi.org/10.1039/D4RE00556B","url":null,"abstract":"In this work, silicalite-1 (S-1) zeolites with a uniform size of about 200 nm were rapidly synthesized by utilizing a micro-liquid film (MLF) reactor assisted hydrothermal method in a short period of 2 h, where the synthesis mixture solution underwent high-speed rotation and shear treatment in a thin liquid film zone within a short mixing time of 1–10 min at the premixing stage, yielding a homogeneous zeolite precursor colloidal suspension. It was revealed that the MLF reactor significantly enhanced the blending of the aqueous and organic phases containing the structure-directing agent and the silicon source, and the resulting homogeneous microenvironment of the zeolite precursor colloidal suspension facilitated the following hydrolysis process of the silicon source and polycondensation of initial structural units ([SiO4]) to a large extent, thereby greatly accelerating nucleation and crystallization processes and thus yielding uniform S-1 zeolite crystals. The present findings provide a viable, economical, and scalable strategy for rapid synthesis of various zeolite materials applied in advanced heterogeneous catalytic reactions.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 864-875"},"PeriodicalIF":3.4,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698406","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

Self-optimising continuous-flow hydrothermal reactor for nanoparticle synthesis† 用于纳米粒子合成的自优化连续流水热反应器†

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-09 DOI: 10.1039/D4RE00339J

Cameron Jackson, Karen Robertson, Vitaliy Sechenyh, Thomas W. Chamberlain, Richard A. Bourne and Edward Lester

引用次数: 0

Flat-plate mesophotoreactor with a serpentine channel and inclined baffles for balancing mixing performance and reaction throughput† 平板介光反应器与蛇形通道和倾斜挡板平衡混合性能和反应吞吐量†

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-01-09 DOI: 10.1039/D4RE00523F

Shuaiyu Chen, Qianrui Lv, Fujun Li, Yuchao Wang, Wenbo Yang, Zhimei Liu, Alexander A. Miskevich, Valery A. Loiko, Shengyang Tao and Lijing Zhang

{"title":"Flat-plate mesophotoreactor with a serpentine channel and inclined baffles for balancing mixing performance and reaction throughput†","authors":"Shuaiyu Chen, Qianrui Lv, Fujun Li, Yuchao Wang, Wenbo Yang, Zhimei Liu, Alexander A. Miskevich, Valery A. Loiko, Shengyang Tao and Lijing Zhang","doi":"10.1039/D4RE00523F","DOIUrl":"https://doi.org/10.1039/D4RE00523F","url":null,"abstract":"This study aims to address the main challenges encountered during the scale-up of flat-plate microreactors in photochemical processes: the decline in mixing and mass transfer efficiency, and the decrease in light energy utilization. Although microreactors have been widely studied for their efficient mass transfer and light energy utilization, the degradation of their performance during scale-up has limited their application in industrial production. Here, a strategy was explored to enhance the mixing efficiency by introducing inclined baffle structures within the mesoscale channel. The performances of a conventional 1 mm microreactor and an optimized mesoreactor with baffles were compared in the homogeneous photochemical reaction. The results indicated that under similar residence times, the yields of both reactors were nearly the same, but the reaction flux was increased by about 180 times compared to the microreactor. The characteristic mixing time (tm) and the second Damköhler number (DaII) for the mesoscopic reactor with baffles were similar to those of the microreactor. This result demonstrates the validity of the scale-up strategy in maintaining high mixing and mass transfer efficiency. The performance of the mesoreactor with baffles in heterogeneous reactions was also investigated, and high yields were achieved by extending the length of the reactor channel. The photochemical space time yield (PSTY) of the baffled mesoreactor with extended channels almost doubles that of the microreactor. This study provides an effective method for scaling up plate-type photochemical microreactors, opening up new possibilities for the application of microreactors in industrial production.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 4","pages":" 894-905"},"PeriodicalIF":3.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2025/re/d4re00523f?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143698409","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