Reaction Chemistry & Engineering最新文献_第9页

Carbonylations in flow: tube-in-tube reactor vs. gas–liquid slug flow† 流动中的羰基化：管中管反应器与气液蛞蝓流

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-06 DOI: 10.1039/D4RE00287C

Agnieszka Ładosz, Astrid Friedli, Arnaud Lhuillery and Georg Rueedi

{"title":"Carbonylations in flow: tube-in-tube reactor vs. gas–liquid slug flow†","authors":"Agnieszka Ładosz, Astrid Friedli, Arnaud Lhuillery and Georg Rueedi","doi":"10.1039/D4RE00287C","DOIUrl":"10.1039/D4RE00287C","url":null,"abstract":"In order to improve the performance of carbonylation reactions in flow, we compared the tube-in-tube system to a gas–liquid two-phase setup. We found that the two-phase slug flow reactor significantly improved the yield and throughput of the reactions tested. First, we performed a reference reaction, methoxycarbonylation of 4-chlorobenzonitrile, using conditions described in the literature and obtained 57% calculated yield in the biphasic setup and 16% in the tube-in-tube setup, with side product formation of 1% and 8% respectively. The reaction was further optimized in both apparatuses, improving the yield in the biphasic setup to 86%, while the tube-in-tube method was limited to about 34%. Finally, a 1.5 g scale-up of a project-relevant building block yielded 73% of the product in the tube-in-tube setup vs. 92% when two-phase flow was used, with more than a ten-fold increase in throughput in the biphasic method. Using gas–liquid flow enabled higher yield and throughput due to direct contact of gas and liquid, better control of CO equivalents and intensification of process conditions: higher temperature, pressure and concentration in the system and significant reduction of residence time.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 12","pages":" 3172-3178"},"PeriodicalIF":3.4,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177821","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

Boosting the kinetics of PET glycolysis† 提高 PET 糖酵解动力学

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-05 DOI: 10.1039/D4RE00235K

Maria Schlüter, Ryota Enomoto, Shin Makino, Lisa Weihs, Cyra Lina Stamm, Kerstin Wohlgemuth and Christoph Held

引用次数: 0

Complete kinetic model and process reengineering of glyoxal oxidation by nitric acid in a capillary microreactor† 毛细管微反应器中硝酸氧化乙二醛的完整动力学模型和流程再造

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-04 DOI: 10.1039/D4RE00313F

Junnan Wang, Wei Zhan, Yating Li, Ting Wang, Chengxiang He, Chunying Zhu, Youguang Ma and Taotao Fu

{"title":"Complete kinetic model and process reengineering of glyoxal oxidation by nitric acid in a capillary microreactor†","authors":"Junnan Wang, Wei Zhan, Yating Li, Ting Wang, Chengxiang He, Chunying Zhu, Youguang Ma and Taotao Fu","doi":"10.1039/D4RE00313F","DOIUrl":"10.1039/D4RE00313F","url":null,"abstract":"The oxidation of glyoxal by nitric acid to glyoxylic acid is a complex process with parallel and consecutive side reactions. The complete reaction kinetics has not been thoroughly reported before. In this work, a continuous flow microreactor system, consisting of micromixers, preheating capillary loops, a capillary microreactor and quenching device, is designed to achieve oxidation under homogeneous conditions. A complete kinetic model is established and all kinetic parameters are obtained. The effects of the molar ratio of nitric acid to glyoxal, reaction temperature and concentration of nitric acid on the reaction are investigated systematically. Based on the process reengineering of existing devices, two schemes of segmented feeding (nitric acid in several segments) and recirculating feeding (incompletely reacted material is returned to the reactor for reaction) are proposed. Finally, the optimal reaction conditions are determined. At 68 °C (the initial molar ratio of nitric acid to glyoxal was 1.26, with a final molar ratio of 1.4 after segmented feeding at once, the molar ratio of sodium nitrite to glyoxal is 0.15, and the mass concentration of nitric acid is 35%), the yield of glyoxal acid is 89.2% and the selectivity is 95.9%. This work refines the kinetic data for the oxidation reaction of glyoxal nitrate. It is of theoretical importance for optimising reaction performance (temperature and residence time regulation strategies) and reactor design.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 11","pages":" 3016-3028"},"PeriodicalIF":3.4,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177823","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 mixed ionic and electronic conducting dual-phase oxygen permeable membrane with high CO2 tolerance 具有高二氧化碳耐受性的离子和电子混合导电双相透氧膜

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-04 DOI: 10.1039/D4RE00381K

Yihong Xu, Hengcheng Zhu, Song Lei, Zihua Wang and Jian Xue

引用次数: 0

Synthesis of glycolic acid by selective oxidation of ethylene glycol over Pt/Sn-Beta in a base-free medium 在无碱介质中通过 Pt/Sn-Beta 上的乙二醇选择性氧化合成乙醇酸

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-04 DOI: 10.1039/D4RE00243A

Yongming Xu, Wenzhao Liu, Bo Xu, Ke Wang, Jinchu Yang, Yueqi Si, Xuebin Zhao, Tingting Zhang, Zhan Zhang, Xueyi Qiao and Tianliang Lu

引用次数: 0

Magnetic mesoporous zirconium phosphate (MMZP-Pr-SO3H): a highly efficient and reusable catalyst for sustainable preparation of phenyl tetrazole and 2-substituted benzoazoles† 磁性介孔磷酸锆（MMZP-Pr-SO3H）：可持续制备苯基四唑和 2-取代苯并唑的高效可重复使用催化剂

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-03 DOI: 10.1039/D4RE00248B

Maryam Tukhani, Abdolreza Hajipour and Alireza Najafi Chermahini

{"title":"Magnetic mesoporous zirconium phosphate (MMZP-Pr-SO3H): a highly efficient and reusable catalyst for sustainable preparation of phenyl tetrazole and 2-substituted benzoazoles†","authors":"Maryam Tukhani, Abdolreza Hajipour and Alireza Najafi Chermahini","doi":"10.1039/D4RE00248B","DOIUrl":"10.1039/D4RE00248B","url":null,"abstract":"Based on the synthesis of mesoporous zirconium phosphate in the presence of magnetic nanoparticles (NPs) and its functionalization with propyl sulfonic acid groups, a new and effective heterogeneous acidic catalyst (MMZP-Pr-SO3H) was prepared. It was attempted to alter the catalyst's properties in this study in order to boost reactant conversion yield and remove unselective reaction pathways by offering complementary characterization. MMZP-Pr-SO3H was used for the eco-friendly and efficient preparation of various tetrazole derivatives through condensation of aryl nitriles and sodium azide in water solvent at 60 °C. This protocol was also practical for benzoazole (benzimidazole, benzoxazole, and benzothiazole) synthesis starting from the in situ oxidation of benzyl alcohol, which demonstrates the dual role of the MMZP-Pr-SO3H catalyst in oxidation and condensation reactions. For both investigated reactions quantitative conversion of the desired product was obtained and the catalyst was simply separated from the reaction mixture by employing an external magnetic field. The MMZP-Pr-SO3H catalyst was regenerated and reused for at least 6 runs without a significant decrease in reaction yield. With the aid of lenses on catalyst active sites, the structural characteristics of the recycled catalyst were thoroughly examined. In contrast to our earlier attempts to study the structural features of the MZP and ZP substrates and use them as catalysts for organic reactions, the MMZP-Pr-SO3H catalyst offers a sustainable and clean synthetic methodology for the large-scale preparation of derivatives of tetrazoles and benzoazoles.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 12","pages":" 3191-3210"},"PeriodicalIF":3.4,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177826","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 novel ultra-high vacuum diffusion setup to study Knudsen diffusion 研究努森扩散的新型超高真空扩散装置

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-03 DOI: 10.1039/D4RE00267A

Maria Mourkou, Haiyue Yu, Sander Baltussen, Nicholas Snead, Nidhi Kapil and Marc-Olivier Coppens

引用次数: 0

Fabrication of black TiO2 through microwave heating for visible light-driven photocatalytic degradation of rhodamine 6G† 通过微波加热制备黑色 TiO2，用于可见光驱动的罗丹明 6G 光催化降解

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-09-02 DOI: 10.1039/D4RE00202D

Riska Rachmantyo, Afif Akmal Afkauni, Ricky Reinaldo, Lei Zhang, Arramel Arramel, Muhammad Danang Birowosuto, Arie Wibowo and Hermawan Judawisastra

{"title":"Fabrication of black TiO2 through microwave heating for visible light-driven photocatalytic degradation of rhodamine 6G†","authors":"Riska Rachmantyo, Afif Akmal Afkauni, Ricky Reinaldo, Lei Zhang, Arramel Arramel, Muhammad Danang Birowosuto, Arie Wibowo and Hermawan Judawisastra","doi":"10.1039/D4RE00202D","DOIUrl":"10.1039/D4RE00202D","url":null,"abstract":"This study aims to prepare titanium dioxide (TiO2) with a narrower band gap, namely black TiO2, using sodium tetrahydroborate (NaBH4) as a reducing material with different mixing ratios and microwave heating, which is a faster, greener, and simpler method than the existing method using furnace heating. Scanning electron microscopy (SEM) inspections indicate that incremental changes of agglomeration are observed upon increasing the NaBH4 mixing ratio, with a moderate 2-fold increase in the particle size (up to 49.9 ± 3.0 nm). The X-ray diffraction (XRD) patterns and Raman spectroscopy confirm that TiO2 is fully converted to the anatase phase after microwave-assisted synthesis. The gradual shift in intense Eg phonon vibration mode at 141 cm−1 to a longer Raman wavelength infers simultaneous defect formations on both pristine and reduced TiO2 surfaces. Furthermore, high-resolution X-ray photoelectron spectroscopy (XPS) measurements confirmed the formation of Ti3+ and Ov. The photodegradation results showed that after visible light irradiation for 4 hours, the T-50 sample exhibited R6G degradation of 49.2 ± 2.0%, outperforming the pristine P25. Moreover, bandgap reduction is successfully achieved from 3.20 eV (P25) to 1.50 eV (T-50) from diffuse reflectance UV-vis (DRUV) spectroscopy measurements. Photoluminescence (PL) spectroscopy found that the energy transfer efficiency of the T-50 sample was 30.6 ± 4.6% during the decomposition of R6G. This combined effort promotes the use of potent black TiO2 through photocatalysis towards fabrication of highly efficient remediation materials in the future.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 11","pages":" 3003-3015"},"PeriodicalIF":3.4,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177844","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

Review of hydrogen ortho–para conversion: experimental data and reaction kinetics† 氢正原转化回顾：实验数据和反应动力学

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-08-30 DOI: 10.1039/D4RE00259H

Fuyu Jiao, Saif Al Ghafri, Keelan T. O'Neill, Paul S. Stanwix, Guinevere M. Sellner, Einar O. Fridjonsson, Neil Robinson, Eric F. May and Michael L. Johns

{"title":"Review of hydrogen ortho–para conversion: experimental data and reaction kinetics†","authors":"Fuyu Jiao, Saif Al Ghafri, Keelan T. O'Neill, Paul S. Stanwix, Guinevere M. Sellner, Einar O. Fridjonsson, Neil Robinson, Eric F. May and Michael L. Johns","doi":"10.1039/D4RE00259H","DOIUrl":"10.1039/D4RE00259H","url":null,"abstract":"Liquid hydrogen is a comparatively high volumetric energy density option for storage and transportation. It however typically requires refrigeration to ∼20 K, which incurs a substantial energy penalty. An additional contribution to this energy consumption is the required exothermic conversion between ortho- and para-hydrogen spin isomers. To realise this conversion in a practical timeframe, the use of a spin conversion catalyst is required. To this end, available reaction data in the literature for the ortho–para forward and backward reaction for the range of catalysts considered is summarised and reviewed. Furthermore, the application of a range of reaction kinetic expressions to this assembled data is considered. Available conversion data for ortho-para conversion is sparse, particularly in the temperature–pressure range relevant to hydrogen liquefaction processes. This is less the case for the reverse para–ortho conversion, presumably a consequence of these data being experimentally easier to access. It can also be concluded, based on the available conversion data, that there is currently no compelling reason to adopt anything more complex than first-order kinetics during hydrogen ortho–para conversion reactor design. Finally, a case study is executed which quantifies the sensitivity of this design to current reaction kinetic parameter uncertainty. This review highlights the sparsity of experimental conversion data at relevant cryogenic conditions and the need for a more comprehensive and fundamental understanding of the origins of the spin conversion catalyst effect and how it is impacted by various deactivation mechanisms.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 11","pages":" 2846-2862"},"PeriodicalIF":3.4,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177845","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

Bayesian-optimization-based design of highly active and stable Fe–Cu/SSZ-13 catalysts for the selective catalytic reduction of NOx with NH3 基于贝叶斯优化方法设计高活性、高稳定性的 Fe-Cu/SSZ-13 催化剂，用于选择性催化还原氮氧化物与 NH3

IF 3.4 3区化学

Reaction Chemistry & Engineering Pub Date : 2024-08-28 DOI: 10.1039/D4RE00327F

Sanha Lim, Hwangho Lee, Hyun Sub Kim, Jun Seop Shin, Jong Min Lee and Do Heui Kim

{"title":"Bayesian-optimization-based design of highly active and stable Fe–Cu/SSZ-13 catalysts for the selective catalytic reduction of NOx with NH3","authors":"Sanha Lim, Hwangho Lee, Hyun Sub Kim, Jun Seop Shin, Jong Min Lee and Do Heui Kim","doi":"10.1039/D4RE00327F","DOIUrl":"10.1039/D4RE00327F","url":null,"abstract":"Catalysts for the selective catalytic reduction of nitrogen oxides (NOx) with NH3 are currently limited by low activity at low temperatures and deactivation under hydrothermal conditions. Herein, we developed a highly active and hydrothermally stable zeolite-based catalyst, Fe–Cu/SSZ-13, using Bayesian optimization (BO). An initial surrogate BO model was constructed and used to identify the optimal Cu and Fe composition through iterative experiments. At each step, the next candidate which optimized the objective function and maximized the acquisition function was selected. The optimized catalyst comprised 2.0 wt% Cu and 2.0 wt% Fe in SSZ-13 zeolite, which was prepared by an incipient wetness impregnation. This catalyst achieved 95.8% NOx conversion at 250 °C and excellent hydrothermal stability, which outperformed the commercial catalyst. Structural characterization demonstrated that its excellent hydrothermal stability resulted from the effect of optimized loading of Fe co-cation. This study highlights the effectiveness of employing BO to design multicomponent catalysts.","PeriodicalId":101,"journal":{"name":"Reaction Chemistry & Engineering","volume":" 11","pages":" 3029-3037"},"PeriodicalIF":3.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142177847","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