Reaction Chemistry & Engineering最新文献_第7页

Physicochemical aspects of solid phase synthesis using cross-linked polymeric matrices 使用交联聚合物基质的固相合成的物理化学方面

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-29 DOI: 10.1039/D5RE00115C

Sebastián Pinzón-López, Eric T. Sletten, Matthias Kraume, Peter H. Seeberger and José Danglad-Flores

引用次数: 0

Lead titanate-modified perovskite with silver and cobalt as a superior photocatalyst toward the conversion of methylene blue 钛酸铅修饰钙钛矿与银和钴作为亚甲基蓝转化的优良光催化剂

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-29 DOI: 10.1039/D4RE00546E

Amin Yousefvand, Mahdieh Ghobadifard and Sajjad Mohebbi

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Stepwise pretreatment involving dilute acid and amine for corn stover fractionation toward full lignocellulose-oriented valorization† 逐步预处理涉及稀酸和胺的玉米秸秆分馏，以充分木质纤维素为导向的增值†

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-28 DOI: 10.1039/D5RE00122F

Samuel Ntakirutimana, Jian-Wei Zhang, Tao Xu, He Liu, Jia-Qi Cui, Tao Shi, Zhi-Hua Liu, Bing-Zhi Li and Ying-Jin Yuan

{"title":"Stepwise pretreatment involving dilute acid and amine for corn stover fractionation toward full lignocellulose-oriented valorization†","authors":"Samuel Ntakirutimana, Jian-Wei Zhang, Tao Xu, He Liu, Jia-Qi Cui, Tao Shi, Zhi-Hua Liu, Bing-Zhi Li and Ying-Jin Yuan","doi":"10.1039/D5RE00122F","DOIUrl":"https://doi.org/10.1039/D5RE00122F","url":null,"abstract":"Lignocellulose valorization is interwoven with fractionation and by tuning the pretreatment setup and conditions, the characteristics of both polysaccharides and lignin could be tailored to match upgrading demands. Here, a stepwise pretreatment approach involving dilute acid and amine was developed for corn stover fractionation. Under the optimized prehydrolysis conditions (3% H2SO4, 120 °C and 2 h), up to ∼97.8% of original xylan was released in the form of xylose, along with a negligible amount of furfural. The signal patterns of confocal laser scanning microscopy revealed that the removal of hemicellulose caused lignin redistribution within the cell wall. At high biomass loading (58%, w/w), amine pretreatment extracted up to ∼82% of lignin with abundant β-O-4 linkages (37–41/100Ar) and strong fluorescence (turquoise and light blue). Enzymatic hydrolysis of mechanochemically pretreated cellulose (MCC) and thermochemically pretreated cellulose (TCC) resulted in glucan conversion of 96.1 and 92.8%, respectively, at 30 mg Cellic® CTec3 HS/g for 72 h. Furthermore, mass balance demonstrated that the combined dilute acid–amine pretreatment could potentially be an efficient fractionation method for lignocellulose. Moreover, a mechanistic understanding of the interactions between lignocellulose components and pretreatment solvents is described. Overall, this pretreatment approach offers the right balance between fractionation of all lignocellulose constituents and preservation of their structural integrity, while simultaneously opening a window for lignin functionalization and depolymerization.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 8","pages":" 1828-1844"},"PeriodicalIF":3.4,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680927","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

Expression of Concern: Immobilized tetrakis(triphenylphosphine)palladium(0) for Suzuki–Miyaura coupling reactions under flow conditions 关注表达：流动条件下固定化四（三苯基膦）钯(0)用于Suzuki-Miyaura偶联反应

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-24 DOI: 10.1039/D5RE90015H

G. Valerie Ramaotsoa, Ian Strydom, Jenny-Lee Panayides and Darren Riley

引用次数: 0

The kinetics of aqueous lactose hydrolysis with sulfuric acid† 硫酸水解乳糖的动力学研究

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-23 DOI: 10.1039/D5RE00175G

Wenjia Wang, Owen J. Dziedzic, Claire R. Lesnjak, Zhuoqian Yu, James Miller, Xiaolei Shi, Jarryd R. Featherman, Scott A. Rankin and George W. Huber

{"title":"The kinetics of aqueous lactose hydrolysis with sulfuric acid†","authors":"Wenjia Wang, Owen J. Dziedzic, Claire R. Lesnjak, Zhuoqian Yu, James Miller, Xiaolei Shi, Jarryd R. Featherman, Scott A. Rankin and George W. Huber","doi":"10.1039/D5RE00175G","DOIUrl":"https://doi.org/10.1039/D5RE00175G","url":null,"abstract":"Lactose-rich Greek yogurt acid whey (GAW) is a waste stream in the dairy industry that has caused severe environmental and economic challenges to the U.S. agricultural communities. Lactose is a sugar found in dairy products that has a low sweetness value and is often difficult to digest. Lactose can be hydrolyzed into glucose–galactose syrups (GGS). However, 5-hydroxymethylfurfural (HMF) is formed which must be removed for the GGS to be used as an alternative sustainable sweetener. In this study, we model lactose hydrolysis and include the first detailed kinetic investigation of HMF formation during sulfuric-acid-catalyzed lactose hydrolysis. We systematically examined the effects of temperature, lactose concentration, pH, and reaction time on the hydrolysis process, proposed 57 possible reaction networks, and developed a kinetic model accurately describing lactose hydrolysis and HMF formation, and calculated key kinetic parameters. Our model demonstrated strong alignment with experimental data and allowed us to simulate optimal conditions for maximizing GGS yield over 89% while minimizing HMF formation by 75–80%. This study provides valuable insights for optimizing reactor design and operational strategies, improving the economic viability and sustainability of GAW valorization.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 7","pages":" 1676-1691"},"PeriodicalIF":3.4,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472771","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

Ag-doped Ni/SiO2 catalysts for the synthesis of aromatic amines from aromatic phenol† 用掺银Ni/SiO2催化剂从芳香酚†合成芳香胺

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-22 DOI: 10.1039/D5RE00055F

Kun Li, Baicheng Feng, Meng Guo, Rong Qu and Yan Jin

{"title":"Ag-doped Ni/SiO2 catalysts for the synthesis of aromatic amines from aromatic phenol†","authors":"Kun Li, Baicheng Feng, Meng Guo, Rong Qu and Yan Jin","doi":"10.1039/D5RE00055F","DOIUrl":"https://doi.org/10.1039/D5RE00055F","url":null,"abstract":"Aromatic primary amines are chemical products and raw materials with a wide range of applications. However, synthesis of primary aromatic amines relies heavily on non-renewable petrochemicals as feedstock. We have prepared a catalyst for Ni/SiO2 doped Ag, and a process has been instituted to prepare aromatic primary amines, which use renewable resources as raw materials through a fixed bed reactor under ambient pressure conditions. The catalyst and process were validated using phenol synthesis of aniline as a template reaction. The resultant surface phenol conversion is 99% and aniline selectivity is 98.5%, and the by-product of the reaction is water, which is in line with the principles of green chemistry. The broad applicability of the catalysts and synthesis process was further verified by the synthesis of aromatic primary amines using the corresponding aromatic phenols. The catalysts were characterized using TEM, SEM, BET, XPS and XRD techniques to fully analyze their morphology, microstructure and elemental composition. The adsorption model was constructed based on the characterization results, and the density functional theory (DFT) calculations confirmed that after doping Ag, phenol formed shorter chemical bonds at the active site of Ni–Ag bimetal through chemical adsorption, which indicated that it had stronger adsorption energy for phenol, and the amount of electron transfer from the active site of Ni–Ag bimetal to phenol was 2.9 fold higher than that before doping, which significantly promoted the activation of reactants.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 7","pages":" 1596-1605"},"PeriodicalIF":3.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472764","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

Aminopropylimidazole and its zinc complex: CO2 chemistry and catalytic synthesis of cyclic carbonates† 氨基丙基咪唑及其锌配合物：CO2化学和催化合成环状碳酸盐†

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-22 DOI: 10.1039/D5RE00073D

Feda'a M. Al-Qaisi, Abdussalam K. Qaroush, Ahmad M. Ala'mar, Ala'a F. Eftaiha, Khaleel I. Assaf and Timo Repo

{"title":"Aminopropylimidazole and its zinc complex: CO2 chemistry and catalytic synthesis of cyclic carbonates†","authors":"Feda'a M. Al-Qaisi, Abdussalam K. Qaroush, Ahmad M. Ala'mar, Ala'a F. Eftaiha, Khaleel I. Assaf and Timo Repo","doi":"10.1039/D5RE00073D","DOIUrl":"https://doi.org/10.1039/D5RE00073D","url":null,"abstract":"The biomimicry of carbonic anhydrase as the interaction between zinc and imidazole serves as an inspiration to engineer synthetic systems for CO2 capture and utilization. In this research, we developed a zinc–aminopropylimidazole (Zn–api) complex to achieve CO2 insertion and subsequently catalyze its cycloaddition reaction with a variety of epoxides. We investigated the complexation and carbamation reactions of both the unbound ligand and its zinc complex in aqueous and DMSO solutions. In D2O, unbound api reacts with CO2 through a 1 : 2 mechanism, forming ammonium carbamate. However, in DMSO-d6, the reaction follows a 1 : 1 pathway and leads to carbamic acid. Interestingly, the Zn–api complex captures CO2 differently depending on the solvent, forming an uncharged species (–NHCO2–Zn) in water and a zwitterionic carbamate (–NH2+Br−–CO2–Zn–Im) in DMSO. To our knowledge, a first time zwitterionic carbamate coordination mode via CO2 insertion is verified by in situ ATR-FTIR with a peak centered at 1704 cm−1 and further supported by quantum chemical calculations. The latter complex exhibits excellent catalytic performance for cyclic carbonates synthesis, achieving 94% and 96% conversion for epichlorohydrin carbonate and glycidol carbonate, respectively, under ambient reaction conditions using a CO2 balloon. Notably, it demonstrates remarkable stability over five consecutive catalytic cycles for the coupling of epichlorohydrin and CO2 without a discernible decrease in activity.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 7","pages":" 1461-1472"},"PeriodicalIF":3.4,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472738","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

High CO conversion in syngas to aromatics by addition of ZnMnZr oxides as methanol synthesis components† 添加ZnMnZr氧化物作为甲醇合成组分，可提高合成气中CO的芳烃转化率

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-21 DOI: 10.1039/D5RE00078E

Shiyu Liu, Qiuyun Huang, Jie Wang, Weihua Shen and Yunjin Fang

{"title":"High CO conversion in syngas to aromatics by addition of ZnMnZr oxides as methanol synthesis components†","authors":"Shiyu Liu, Qiuyun Huang, Jie Wang, Weihua Shen and Yunjin Fang","doi":"10.1039/D5RE00078E","DOIUrl":"https://doi.org/10.1039/D5RE00078E","url":null,"abstract":"In the oxide-zeolite (OX-ZEO) strategy, it is challenging to achieve both higher CO conversion and aromatics selectivity. In this paper, the methanol synthesis component xZn2Mn8Zr was prepared. With increasing Zn content, CO conversion over the ternary oxides increased without a remarkable decrease in the combined selectivity of methanol and dimethyl ester (DME). The 2Zn2Mn8Zr (molar ratio) was then coupled with either SAPO-34 or H-ZSM-5 for syngas conversion. Combined with the results of thermogravimetric analysis, a bifunctional catalyst with more residual hydrocarbon pool species (HCPs) was capable of achieving higher selectivity of unsaturated organic products. The loss of HCPs should be attributed to over-hydrogenation. The over-hydrogenation could be related to either Zn concentration or the close contact of 2Zn2Mn8Zr with H-ZSM-5. To alleviate such over-hydrogenation, ZnMnZr pellets with lower Zn concentration were mixed with the pellets of 6Mn4Zr/H-ZSM-5 using a granule mixing method. The multi-functional catalyst exhibited much higher activity in syngas-to-aromatics (STA) conversion, especially at high space velocities. The CO conversion over the multi-functional catalyst could reach 43% at 600 mL gcat−1 h−1, with aromatics selectivity around 72%, and it remained stable during a 100 h reaction.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 8","pages":" 1803-1811"},"PeriodicalIF":3.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144680945","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

Kinetic and mechanistic studies of cyclohexane oxidation with tert-butyl hydroperoxide over M–N4 catalysts† M-N4催化剂催化过氧化叔丁基氧化环己烷的动力学和机理研究

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-21 DOI: 10.1039/D5RE00031A

Ethan P. Iaia, Miles G. Miller, Ademola Soyemi, Martin G. Bakker, Tibor Szilvási and James W. Harris

{"title":"Kinetic and mechanistic studies of cyclohexane oxidation with tert-butyl hydroperoxide over M–N4 catalysts†","authors":"Ethan P. Iaia, Miles G. Miller, Ademola Soyemi, Martin G. Bakker, Tibor Szilvási and James W. Harris","doi":"10.1039/D5RE00031A","DOIUrl":"https://doi.org/10.1039/D5RE00031A","url":null,"abstract":"Oxidation of cyclohexane with tert-butyl hydroperoxide (TBHP) is a common probe reaction for molecular complexes, though the kinetics of this reaction are seldom reported. Here, we synthesize metal–nitrogen-doped carbons (M-N-Cs) and a series of zeolite-encapsulated metal phthalocyanine (MPC) catalysts and compare their reactivity in cyclohexane oxidation with TBHP. These materials all have primary binding sites that include square planar metals bound to four nitrogen atoms (M–N4 sites). We measure the apparent activation energy for this reaction, and compare the reactivity of M-N-C and MPC catalysts with varied metal central atoms (M = Fe, Mn, Co, Cu, Cr, Ni), of which Fe-containing catalysts are the most reactive. Fe-N-C catalysts are more stable with reuse than FePC catalysts. Apparent reaction orders are less than one for both reactants, suggesting a surface mediated reaction. Cyclohexanol and cyclohexanone form in parallel at short reaction times, while cyclohexanol further reacts to cyclohexanone at longer reaction times. DFT calculations show that the reaction may follow a radical-mediated Eley–Rideal mechanism that is primarily mediated via tert-butoxy radicals formed at the metal site. Microkinetic modeling of the proposed mechanism reproduces experimental trends in product rates and selectivity of the main reaction products without requiring any parameter estimation. This study demonstrates that M-N-C and MPC catalysts perform cyclohexane oxidation with TBHP with similar per metal-atom initial rates. These results will enable judicious use of cyclohexane oxidation with TBHP as a probe reaction to compare reactivity of catalysts with M–N4 active sites.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 7","pages":" 1647-1664"},"PeriodicalIF":3.4,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144472769","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

A waste-free packed-bed continuous-flow synthesis of disulfiram with a composite catalyst† 用复合催化剂制备无废填料床连续流法合成双硫仑

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2025-04-18 DOI: 10.1039/D5RE00028A

Yu-Zhen Xue, Xing-Jian Li, Ze-Run Zhao, Hao-Xing Xu, Shun-Guo Fu, Fang-Xiao Wang and Xiao Wang

引用次数: 0