Kinetics and Catalysis最新文献_第7页

Facile Catalysis Using Glycol-Reduced Bentonite/Metal Nanoparticles as a Novel Heterogeneous Catalyst for the Hofmann Degradation of Amides to Amines 二醇还原膨润土/金属纳米颗粒催化酰胺Hofmann降解为胺的新型非均相催化剂

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-09-19 DOI: 10.1134/S0023158424602134

Mandira Debnath, Manash Pratim Barman, Debasis Borah, Deepmoni Brahma, Md. Amanur Rahman, Subhasish Roy, Hemaprobha Saikia

{"title":"Facile Catalysis Using Glycol-Reduced Bentonite/Metal Nanoparticles as a Novel Heterogeneous Catalyst for the Hofmann Degradation of Amides to Amines","authors":"Mandira Debnath, Manash Pratim Barman, Debasis Borah, Deepmoni Brahma, Md. Amanur Rahman, Subhasish Roy, Hemaprobha Saikia","doi":"10.1134/S0023158424602134","DOIUrl":"10.1134/S0023158424602134","url":null,"abstract":"The Hofmann degradation reaction converts amides into primary amines, which are essential intermediates in various industrial processes. In this study, we investigate the use of bentonite-supported metal nanoparticles (NPs)—specifically ruthenium and copper–as catalysts for the Hofmann degradation of benzamide to phenylamine. The metal nanoparticles were synthesized via a glycol reduction method, allowing precise control over their size and distribution. Bentonite was chosen as the support material due to its high surface area and cation exchange capacity, which enhance the dispersion and stability of the metal nanoparticles. The successful synthesis of Ru and Cu nanoparticles was confirmed through X-ray photoelectron spectroscopy (XPS), with binding energy values of 283 eV for Ru3d5/2 and 933 eV for Cu2p3/2, indicating the presence of metallic Ru and Cu. This confirms the effective reduction of metal ions to their elemental forms. We then conducted the Hofmann degradation of benzamide using bentonite alone, bentonite supported with copper nanoparticles (Bent/Cu-NPs), and bentonite supported with ruthenium nanoparticles (Bent/Ru-NPs) prepared via the glycol reduction method. Notably, Bent/Ru-NPs achieved a reaction efficiency of 62% within approximately 1.5 h at a catalyst dosage of 0.005 g. Additionally, Bent/Ru-NPs demonstrated catalytic stability over four consecutive cycles, maintaining significant activity.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 4","pages":"390 - 405"},"PeriodicalIF":1.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145479575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Ammonia Decomposition for Hydrogen Production on Се1 – хZrхО2 Based Ru Catalysts 基于Се1 - хZrхО2 Ru催化剂的氨分解制氢

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-09-19 DOI: 10.1134/S0023158425600427

Z. A. Fedorova, V. A. Borisov, V. L. Temerev, E. Y. Gerasimov, D. A. Svintsitskiy, D. A. Shlyapin, P. V. Snytnikov

{"title":"Ammonia Decomposition for Hydrogen Production on Се1 – хZrхО2 Based Ru Catalysts","authors":"Z. A. Fedorova, V. A. Borisov, V. L. Temerev, E. Y. Gerasimov, D. A. Svintsitskiy, D. A. Shlyapin, P. V. Snytnikov","doi":"10.1134/S0023158425600427","DOIUrl":"10.1134/S0023158425600427","url":null,"abstract":"Сommercial cerium-zirconium oxide supports (Ce0.5Zr0.5O2, Ce0.75Zr0.25O2 and Ce0.4Zr0.5Y0.05La0.05O2) were used to prepare Ru/CeZrOx catalysts by the sorption-hydrolytic method with ruthenium loading of ~2 wt %. The catalyst specific surface areas ranged within 80–91 m2/g. The XRD data indicate the formation of a substitutional solid solution. According to the HRTEM data, there are no ruthenium particles on the support surface in Ru/Се0.75Zr0.25О2 and Ru/Ce0.4Zr0.5Y0.05La0.05O2 samples. Most likely, the ruthenium particles are in a highly dispersed state. At 500°C and WHSV of 300 000 ({text{m}}{{{text{L}}}_{{{text{N}}{{{text{H}}}_{{text{3}}}}}}}) ({text{g}}_{{{text{cat}}}}^{{-1}}) h–1, the catalysts demonstrated the highest hydrogen productivity of 73.8–85.4 ({text{mmo}}{{{text{l}}}_{{{{{text{H}}}_{{text{2}}}}}}}) ({text{g}}_{{{text{cat}}}}^{{-1}}) min–1) and NH3 conversion of 22–25.5% that compares well with the best results reported in the literature and exceeds the catalysts performance we have previously obtained for Ru/Ce0.75Zr0.25O2 catalyst prepared by impregnation. The activity of most active Ru/Ce0.4Zr0.5Y0.05La0.05 catalyst remained stable throughout the all test period (~46 h).","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 4","pages":"418 - 432"},"PeriodicalIF":1.4,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145479573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Oleg Naumovich Temkin (On His 90th Birthday) 奥列格·瑙莫维奇·特姆金（庆祝他90岁生日）

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-09-04 DOI: 10.1134/S0023158425600609

L. G. Bruk, O. L. Kalya, V. R. Flid, G. K. Shestakov

引用次数: 0

6-Amino-5-hydroxy-2,3-dimethylpyrimidin-4(3H)-one as an Oxidation Inhibitor 6-氨基-5-羟基-2,3-二甲基嘧啶-4(3H)- 1作为氧化抑制剂

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-09-04 DOI: 10.1134/S0023158424602420

A. R. Migranov, L. R. Yakupova, R. L. Safiullin, S. A. Grabovsky

{"title":"6-Amino-5-hydroxy-2,3-dimethylpyrimidin-4(3H)-one as an Oxidation Inhibitor","authors":"A. R. Migranov, L. R. Yakupova, R. L. Safiullin, S. A. Grabovsky","doi":"10.1134/S0023158424602420","DOIUrl":"10.1134/S0023158424602420","url":null,"abstract":"The rate constant of the reaction of 6-amino-5-hydroxy-2,3-dimethylpyrimidin-4(3H)-one (1) with peroxyl radicals was measured in a model system of radical chain oxidation of 1,4-dioxane. Oxidation of 1,4-dioxane with atmospheric oxygen was carried out at a temperature of 333 K. Oxygen uptake was monitored using a universal differential manometric setup. It was found that 6-amino-5-hydroxy-2,3-dimethylpyrimidin-4(3H)-one slowed down the rate of 1,4-dioxane oxidation. The effective rate constant of the interaction of the peroxyl radical of 1,4-dioxane with 6-amino-5-hydroxy-2,3-dimethylpyrimidin-4(3H)-one was found: fk7 = (6.2 ± 0.1) × 105 L mol–1 s–1. The stoichiometric inhibition coefficient f = 1.3 ± 0.1 was calculated from the slope of the dependence of the induction period length on the concentration of 6-amino-5-hydroxy-2,3-dimethylpyrimidin-4(3H)-one. The experimental data indicated that 6-amino-5-hydroxy-2,3-dimethylpyrimidin-4(3H)-one has antioxidant properties. It was assumed that the hydroxyl group –OH located in the 5-position of the ring was the site attacked by the peroxyl radical.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 3","pages":"280 - 285"},"PeriodicalIF":1.4,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Titanium–Magnesium Catalysts for Propylene Polymerization: Synthesis with Ethers and Subsequent Adding of Dibutyl Phthalate 丙烯聚合用钛镁催化剂：醚合成及邻苯二甲酸二丁酯的加入

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-09-04 DOI: 10.1134/S0023158424602742

D. K. Maslov, G. D. Bukatov

{"title":"Titanium–Magnesium Catalysts for Propylene Polymerization: Synthesis with Ethers and Subsequent Adding of Dibutyl Phthalate","authors":"D. K. Maslov, G. D. Bukatov","doi":"10.1134/S0023158424602742","DOIUrl":"10.1134/S0023158424602742","url":null,"abstract":"Propylene polymerization titanium–magnesium catalysts in the presence of ethers are synthesized. It is shown that aliphatic ethers and 1.1-diethers are participated in the formation of magnesium chloride although they are not contained in catalysts. Aromatic ethers (except methyl phenyl ether) are ineffective in the MgCl2 formation. Subsequent adding of the phthalate (DBP/Mg = 0.05 mol) lead to the synthesis of the phtalate titanium–magnesium catalyst which in the case of aliphatic ethers and 1.1-diethers have catalytic properties higher than the titanium–magnesium catalyst for comparison (DBP/Mg = 0.05 mol) and close ones (for some ethers) to the standard titanium–magnesium catalysts (DBP/Mg = 0.2 mol). Comparative analysis of the composition of phthalate titanium–magnesium catalysts prepared using ethers or ketones and X-ray data indicate a close size of MgCl2 crystallites in both cases. The composition of titanium–magnesium catalysts synthesized in the presence of ethers is consistent with the distribution of dimeric TiCl4 complexes alternating with chlorine vacancies (…□TiTi□TiTi…) on the lateral cuts 104.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 3","pages":"330 - 341"},"PeriodicalIF":1.4,"publicationDate":"2025-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144990426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Methylcyclohexane Dehydrogenation on Platinum–Alumina Catalysts Promoted with Vanadium and Tin 钒锡促进铂-氧化铝催化剂甲基环己烷脱氢研究

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-09-04 DOI: 10.1134/S002315842560018X

A. D. Lozhkin, N. S. Panina, T. M. Buslaeva, L. G. Bruk

引用次数: 0

XPS Study of the [Ir(COD)Cl]2–L–SiO2 Catalytic System [Ir(COD)Cl] 2-L-SiO2催化体系的XPS研究

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-08-05 DOI: 10.1134/S002315842560004X

A. V. Nartova, K. G. Donskikh, R. I. Kvon, L. M. Kovtunova, A. M. Dmitrachkov, I. V. Skovpin, I. V. Koptyug, V. I. Bukhtiyarov

{"title":"XPS Study of the [Ir(COD)Cl]2–L–SiO2 Catalytic System","authors":"A. V. Nartova, K. G. Donskikh, R. I. Kvon, L. M. Kovtunova, A. M. Dmitrachkov, I. V. Skovpin, I. V. Koptyug, V. I. Bukhtiyarov","doi":"10.1134/S002315842560004X","DOIUrl":"10.1134/S002315842560004X","url":null,"abstract":"The X-ray photoelectron spectroscopy (XPS) and nuclear magnetic resonance (NMR) spectroscopy were used to study the features of anchoring of the [Ir2(COD)2Cl2] complex on the surface of modified silica gel L–SiO2 (where L is NC5H5–CH2–CH2–, N(CH3)2–CH2–CH2–CH2–, NH2–C3H6–) depending on the nature of the linker and the conditions of preparation of the systems. The catalytic activity was tested in reactions of gas-phase selective hydrogenation of propylene with parahydrogen (p-H2). According to the XPS data, a single-site iridium catalyst is prepared in all cases. Analysis of the XPS spectra indicates the possibility of anchoring the complex through one of the iridium atoms while preserving the dimer. It was shown that at different durations of interaction of the iridium complex solution with modified NH2–C3H6–silica gel approximately the same amount of the complex is anchored, but the nature of the complex coordination changes. For the sample obtained by long-term interaction of the complex solution with the modified support (24 h), a high increase in the NMR signal was observed at 60°C, while in the case of the sample prepared by short-term interaction (1 h), the signal increased with a rise in temperature to 80°C.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 2","pages":"248 - 256"},"PeriodicalIF":1.4,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Active and Stable Ni/Al2O3–(Zr + Ce)O2 Catalyst for Syngas Production via Glycerol Dry Reforming 甘油干重整制合成气的活性稳定Ni/Al2O3 - (Zr + Ce)O2催化剂

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-08-05 DOI: 10.1134/S0023158425600312

Yuri Fionov, Sophya Semenova, Seraphim Khaibullin, Elena Fionova, Irena Bratchikova, Andrey Kharlanov, Anna Zhukova

引用次数: 0

Catalytic Properties of a Nanozyme Based on Silver Nanoparticles Immobilized into a Polymethacrylate Matrix 聚合甲基丙烯酸酯基固定化银纳米酶的催化性能研究

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-08-05 DOI: 10.1134/S002315842560035X

S. K. Bragina, N. A. Gavrilenko, N. V. Saranchina, M. A. Gavrilenko

引用次数: 0

Mathematical Modeling of Complex Oscillations during Ethylene Oxidation over a Nickel Catalyst 镍催化剂上乙烯氧化过程中复杂振荡的数学建模