Kinetics and Catalysis最新文献_第3页

Effect of Stabilizing Ligand on the Catalytic Properties of Copper Sulfide Nanoclusters in CO Oxidation 稳定配体对硫化铜纳米簇氧化 CO 催化特性的影响

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-09-04 DOI: 10.1134/S0023158424601785

P. S. Bandurist, D. A. Pichugina

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Hydrogenation of 1,3-Butadiene over Nickel-Containing Carbon Xerogels 在含镍碳Xerogels上氢化1,3-丁二烯

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-09-04 DOI: 10.1134/S0023158424601773

G. B. Veselov, Yu. V. Shubin, A. A. Vedyagin

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A Kinetic Study of the Nonisothermal Pyrolysis of Wood 木材非等温热解动力学研究

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-09-04 DOI: 10.1134/S0023158424601657

S. V. Vasilevich, A. V. Mitrofanov

{"title":"A Kinetic Study of the Nonisothermal Pyrolysis of Wood","authors":"S. V. Vasilevich, A. V. Mitrofanov","doi":"10.1134/S0023158424601657","DOIUrl":"10.1134/S0023158424601657","url":null,"abstract":"Results of a kinetic study of the pyrolysis of woody biomass (Quercus robur) under conditions of continuous heating to a temperature of 873 K at a constant rate of 1.25, 2.5, 5, and 10 K/min have been discussed. An integral method has been used to describe the reaction mechanism and determine the macrokinetic parameters. It has been found that, from a phenomenological point of view, the averaged woody biomass pyrolysis reaction under test conditions corresponds to a three-dimensional diffusion model (1.25 K/min), a model described by the third-order reaction equation (2.5, 5 K/min), and a one-dimensional diffusion model (10 K/min). In this case, the relative standard deviation of the conversion values calculated using this equation from the test data is <11.2%. The division of the averaged reaction into three stages (first stage is completed at a temperature of 390 K; the second, at 579 K; the third, at the completion of the conversion process) leads to agreement between the calculated degree of degradation of the studied biomass samples and the test values in a range of the degree of degradation of 0–1. Although the relative standard deviation does not exceed 3.5%, the division of the averaged reaction into stages does not exclude discrepancies in the values of the determined macrokinetic parameters. It has been shown that the choice of the model that provides the best description of the wood conversion process depends on heating rate during the tests. Owing to this dependence, the macrokinetic parameter values significantly differ from each other. Taking this fact into account, it can be concluded that the selected models and calculated macrokinetic parameters are of a formal nature and cannot be thought of as physicochemical characteristics that are universal with respect to the subject of research. Discrepancies in calculations of macrokinetic parameters that are caused by the effect of heating rate can be eliminated by studying the kinetics of conversion under isothermal conditions (at a constant temperature).","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 4","pages":"320 - 335"},"PeriodicalIF":1.3,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142200008","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}

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Influence of Support Properties on the State and Activity of Supported Palladium in the Decomposition Reaction of Hydrazine Monohydrate 支撑特性对支撑钯在一水肼分解反应中的状态和活性的影响

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-09-04 DOI: 10.1134/S0023158424601748

V. A. Matyshak, O. N. Silchenkova, A. N. Ilichev, M. Ya. Bykhovsky, V. Yu. Bychkov

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Kinetics of the Interaction of Acrylonitrile with Cyclopentadiene in the Diels–Alder Reaction in the Presence of Synthetic Zeolites 合成沸石存在下二元-阿尔德反应中丙烯腈与环戊二烯的相互作用动力学

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-09-04 DOI: 10.1134/S0023158424601633

D. Sh. Fakhretdinov, I. Sh. Yakupov, A. I. Iskhakova, E. R. Latypova, R. F. Talipov

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Chapter II. Chain Nature of Ignition and Explosion of Gases at Atmospheric and High Pressures 第 II 章.气体在大气压和高压下点燃和爆炸的连锁性质

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-08-20 DOI: 10.1134/S0023158424601268

V. V. Azatyan

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Chapter VI. Specificities of Hydrazine Ignition and Explosion as an Example of Anomalous Critical Phenomena 第 VI 章.作为异常临界现象实例的肼点燃和爆炸的特殊性

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-08-20 DOI: 10.1134/S002315842460130X

V. V. Azatyan

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Chapter XIII. Studying Elementary Reactions Using Inhibition Phenomenon and Flammability Limits 第 XIII 章.利用抑制现象和可燃性极限研究基本反应

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-08-20 DOI: 10.1134/S0023158424601372

V. V. Azatyan

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Chapter XI. Chain Avalanche as a Kinetic Basis of Detonation. Chemical Control Methods 第 XI 章.作为引爆动力学基础的链崩。化学控制方法

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-08-20 DOI: 10.1134/S0023158424601359

V. V. Azatyan

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Chapter III. Specificities of the Mechanism and Energy of Branching Chain Processes 第 III 章.支链过程的机制和能量特性

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-08-20 DOI: 10.1134/S002315842460127X

V. V. Azatyan

{"title":"Chapter III. Specificities of the Mechanism and Energy of Branching Chain Processes","authors":"V. V. Azatyan","doi":"10.1134/S002315842460127X","DOIUrl":"10.1134/S002315842460127X","url":null,"abstract":"It is shown that the features of chain processes are determined mainly by the fact that most of the internal energy of the initial reagents is converted into the energy of free valences of atoms and radicals. This results in high concentrations of active particles, which react with the initial reagents at higher rates, providing intensive self-heating, which additionally accelerates the process. It is noted that, without considering the chain nature of reactions, it is impossible to explain ignition upon heating, since the high activation energies of reactions of only molecular reagents exclude an increase in the rate during heating. Taking into account the chain nature of combustion reactions made it possible to explain ignition upon heating and develop a theory of the phenomenon. An explanation is given to the most important characteristic of gas combustion: the length of reaction chains, which determines the role of the chain mechanism in combustion, and the dependence of kinetics on temperature. A solution to the problems of the third flammability limit, confirmed by kinetic and spectroscopic experiments, was obtained, as well as the evidence of the presence of HO2 radicals in the flame, their active role in the heterogeneous development of reaction chains and in combustion in general. The possibility of replacing the solution of diffusion differential equations by effective kinetic parameters when describing combustion has been experimentally proven.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 1 supplement","pages":"S25 - S36"},"PeriodicalIF":1.3,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199899","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