Kinetics and Catalysis最新文献_第6页

NaBH4 Hydrolysis over Silver Nanoparticles Synthesized via Combustion Route 燃烧法制备NaBH4纳米银的水解研究

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-12-11 DOI: 10.1134/S0023158424601517

Bahaa M. Abu-Zied, Tarek T. Ali, Lamia Adly

{"title":"NaBH4 Hydrolysis over Silver Nanoparticles Synthesized via Combustion Route","authors":"Bahaa M. Abu-Zied, Tarek T. Ali, Lamia Adly","doi":"10.1134/S0023158424601517","DOIUrl":"10.1134/S0023158424601517","url":null,"abstract":"Solution combustion synthesis (SCS) is a powerful route for synthesizing a wide range of nanostructures. The fine adjustment of the experimental parameters (fuel type, fuel/oxidizer ratio, pretreatment temperature, etc.) plays a crucial role in controlling the structural as well as the textural features of the resulting nanomaterial. In this study, we investigate the synthesis of silver nanoparticles (Ag NPs) using the combustion method with glycine as a fuel. The calcination of the silver nitrate/glycine precursor was performed over a temperature range of 150–600°C. The obtained Ag NPs were characterized by XRD, FTIR, TEM, and XPS techniques. XRD diffraction patterns revealed that the development of Ag NPs started at 150°C. FTIR spectroscopy confirmed the presence of various functional groups in the calcined samples. TEM images revealed that increasing the temperature from 200 to 600°C resulted in a morphology change from accumulated spheres into inter-welded capsules. XPS analysis detected Ag, O, and C at the surface of the prepared Ag NPs. NaBH4 hydrolysis, at the temperature range of 30–50°C, was chosen for evaluating the activity of the prepared Ag NPs. It was found that the activity increased with increasing reaction temperature, with the optimal activity exhibited by the sample calcined at 400°C. The investigation was extended to check the effect of various parameters including NaBH4 weight, alkalinity, and recycling on the activity of the optimal catalyst.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 6","pages":"806 - 817"},"PeriodicalIF":1.3,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481252","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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Innovative Synthesis and Catalytic Proficiency of Mg/Al/La Mixed Oxide Catalysts in Glycerol Transesterification with Dimethyl Carbonates Mg/Al/La混合氧化物催化剂在甘油与碳酸二甲酯酯交换反应中的创新合成及催化性能

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-12-11 DOI: 10.1134/S0023158423601328

M. Malyaadri, K. Jagadeeswaraiah, T. Narasimha murthy, PRG. Nallappa reddy

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Facile Greener Synthesis of CoTiO3/TiO2 Composite Nanocatalysts: Understanding the Origin of Synergistic Effect CoTiO3/TiO2复合纳米催化剂的绿色合成：协同效应的起源

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-12-11 DOI: 10.1134/S0023158424601712

Leivon Chungkholen Kom, Henam Sylvia Devi, Henam Premananda Singh, Sankaranarayanan Nagarajan

{"title":"Facile Greener Synthesis of CoTiO3/TiO2 Composite Nanocatalysts: Understanding the Origin of Synergistic Effect","authors":"Leivon Chungkholen Kom, Henam Sylvia Devi, Henam Premananda Singh, Sankaranarayanan Nagarajan","doi":"10.1134/S0023158424601712","DOIUrl":"10.1134/S0023158424601712","url":null,"abstract":"Understanding the composition-activity relationship is essential for exploiting the synergistic properties of composite nanomaterials in catalytic processes. This article provides insights into the origin of the synergistic effect in composite nanocatalysts by constructing different compositions of well-defined CoTiO3/TiO2 nanoparticles (NPs) with various Ti : Co weight ratios of 2 : 1 (C1) and 1 : 1 (C2). An environmentally benign method utilizing aqueous cinnamon extract was employed for the catalyst preparations. Catalytic tests for the reductive degradation of Congo Red and rhodamine B dyes reveal an activity order of C1 > C2 > TiO2 NPs, suggesting possible surface reconstruction in the composite nanocatalytic system. Detailed structural and compositional analyses indicate that the exceptional catalytic performance of C1 NPs is closely related to synergistic electronic and strain effects. This synergistic effect in composite NPs can be optimized by adjusting the ratio of constituents, which is anticipated to play a more crucial role in catalysis than particle size. Furthermore, the composite C1 NPs exhibit remarkable robustness, maintaining recyclability up to the fifth cycle with only an 8.51% loss in performance.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 6","pages":"818 - 831"},"PeriodicalIF":1.3,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481254","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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Reassembled Nanosheets of Layered Perovskite-Like Niobate HCa2Nb3O10 as Photocatalysts for Hydrogen Production from Aqueous Solutions of Plant Biomass Processing Products 层状透辉石类铌酸盐 HCa2Nb3O10 的重组装纳米片作为光催化剂，用于从植物生物质加工产品的水溶液中制氢

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-11-04 DOI: 10.1134/S0023158424601943

S. A. Kurnosenko, O. I. Silyukov, I. A. Rodionov, I. A. Minich, A. I. Ustinova, I. A. Zvereva

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Aromatic Cross-Conjugated Hydrazones as Inhibitors of the Radical Chain Oxidation of Styrene 作为苯乙烯自由基链氧化抑制剂的芳香族交叉共轭肼酮

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-11-04 DOI: 10.1134/S0023158424601852

S. A. Grabovskii, I. S. Odin, A. A. Golovanov, A. V. Antipin, R. L. Safiullin

{"title":"Aromatic Cross-Conjugated Hydrazones as Inhibitors of the Radical Chain Oxidation of Styrene","authors":"S. A. Grabovskii, I. S. Odin, A. A. Golovanov, A. V. Antipin, R. L. Safiullin","doi":"10.1134/S0023158424601852","DOIUrl":"10.1134/S0023158424601852","url":null,"abstract":"The bond dissociation enthalpy of the N–H bond was calculated for the following compounds: 1-((E)-1,5-diphenylpent-1-en-4-yn-3-ylidene)-2-(o-tolyl)hydrazine, 1-((E)-1-(4-methoxyphenyl)-5-phenylpent-1-en-4-yn-3-ylidene)-2-phenylhydrazine, 1-((E)-1-phenylpent-1-en-4-yn-3-ylidene)-2-(p-tolyl)hydrazine, 1-((E)-1-(4-methoxyphenyl)-5-trimethylsilyl-1-en-4-yn-3-ylidene)-2-phenylhydrazine, and 1-((E)-1-(toiphenyl-2)-5-phenylpent-1-en-4-yn-3-ylidene)-2-phenylhydrazine. The calculations were performed by the M06-2X/6-311+G(2df,2pd)//B3LYP/6-31G(d) method using the homodesmotic approach. The bond dissociation enthalpy is lower than 77 kcal/mol for all the cross-conjugated hydrazone derivatives under study. The experimental rate constants for the reactions of the derivatives with peroxyl radicals in chlorobenzene during the initiated styrene oxidation are comparable to those of aromatic amines and are in the range (1.1–2.5) × 105 M−1 s−1. The stoichiometric inhibition coefficient depends on the structure of the derivatives and varies from 0.7 to 1.9. The inhibition is discussed within the framework of the radical mechanism.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 5","pages":"451 - 457"},"PeriodicalIF":1.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579429","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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Epoxide-Assisted Synthesis of Photocatalytically Active TiO2 and Pt/TiO2 Aerogels 环氧化物辅助合成具有光催化活性的 TiO2 和 Pt/TiO2 气凝胶

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-11-04 DOI: 10.1134/S0023158424601980

L. A. Polevoi, E. A. Kozlova, A. V. Zhurenok, E. Yu. Gerasimov, A. A. Saraev, M. V. Golikova, A. E. Baranchikov

引用次数: 0

Visible Light–Induced Photocatalytic Degradation of Tetracycline over Exfoliated Graphitic C3N4 Doped with Cubic Co3O4 掺杂立方氧化钴的剥离石墨 C3N4 在可见光诱导下光催化降解四环素

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-11-04 DOI: 10.1134/S002315842460189X

M. I. Chebanenko, Sh. O. Omarov, D. S. Dmitriev, K. D. Martinson, M. V. Tomkovich, V. I. Popkov

{"title":"Visible Light–Induced Photocatalytic Degradation of Tetracycline over Exfoliated Graphitic C3N4 Doped with Cubic Co3O4","authors":"M. I. Chebanenko, Sh. O. Omarov, D. S. Dmitriev, K. D. Martinson, M. V. Tomkovich, V. I. Popkov","doi":"10.1134/S002315842460189X","DOIUrl":"10.1134/S002315842460189X","url":null,"abstract":"In this work, steam-exfoliated graphitic carbon nitride was used as a promising basis for the development of photoactive materials for processes induced by visible light. Nanocrystalline cobalt(II,III) oxide, obtained by the solution combustion method followed by heat treatment of the reaction products, was used as a cocatalyst. Nanocomposite materials were prepared by joint ultrasonic treatment of graphite-like carbon nitride and cobalt(II,III) oxide in ethanol. The prepared series of samples with different weight fractions of the oxide (5–10 wt %) was studied by powder X-ray diffractometry, scanning electron microscopy, low-temperature nitrogen adsorption–desorption, and diffuse reflectance electron spectroscopy. The photocatalytic activity of the samples was evaluated in the oxidation of tetracycline hydrochloride. It was found that the rate constant of the photocatalytic reaction reached its maximum value with composites containing 7 wt % Co3O4 (k = 0.0104 min–1). The photovoltaic response studies demonstrated that the presence of cobalt oxide in the samples can significantly decrease the rate of charge carrier recombination to increase the generated current by a factor of 1.2.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 5","pages":"548 - 555"},"PeriodicalIF":1.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579432","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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Photocatalytic Activity of Heterostructures Based on Graphite-Like Carbon Nitride Modified with Few-Layer Black Phosphorus and Cobalt Phosphide in the Hydrogen Evolution Reaction 基于经少层黑磷和磷化钴修饰的类石墨氮化碳的异质结构在氢气进化反应中的光催化活性

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-11-04 DOI: 10.1134/S0023158424601979

Aidar M. Kuchkaev, A. V. Zhurenok, Airat M. Kuchkaev, A. V. Sukhov, V. S. Kashansky, M. M. Nikitin, K. A. Litvintseva, S. V. Cherepanova, E. Yu. Gerasimov, E. A. Kozlova, O. G. Sinyashin, D. G. Yakhvarov

{"title":"Photocatalytic Activity of Heterostructures Based on Graphite-Like Carbon Nitride Modified with Few-Layer Black Phosphorus and Cobalt Phosphide in the Hydrogen Evolution Reaction","authors":"Aidar M. Kuchkaev, A. V. Zhurenok, Airat M. Kuchkaev, A. V. Sukhov, V. S. Kashansky, M. M. Nikitin, K. A. Litvintseva, S. V. Cherepanova, E. Yu. Gerasimov, E. A. Kozlova, O. G. Sinyashin, D. G. Yakhvarov","doi":"10.1134/S0023158424601979","DOIUrl":"10.1134/S0023158424601979","url":null,"abstract":"The photocatalytic activity of 2D/2D/0D heterostructures based on few-layer black phosphorus (FLBP) g-C3N4/FLBP/Co2P in the reaction of photocatalytic hydrogen formation from an aqueous solution of triethanolamine under under visible light irradiation (400 nm) was studied for the first time. An original method for the preparation of the g‑C3N4/FLBP/Co2P composite photocatalyst is proposed, which consists of the solvothermal synthesis of cobalt phosphide Co2P nanoparticles, their immobilization on the surface of FLBP, and subsequent mixing of the FLBP/Co2P heterostructure with g‑C3N4. The synthesized photocatalysts were characterized by physicochemical analytical methods (X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission microscopy, energy-dispersive X-ray spectroscopy). The hydrogen evolution rate in the presence of the g‑C3N4/FLBP/Co2P heterostructure was 0.09 mmol ({text{g}}_{{{text{cat}}}}^{{ - 1}}) h–1, which is 25 times higher than the same characteristic for the unmodified g‑C3N4 sample. The obtained numerical values of the photocatalytic activity are at the level of the literature values.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 5","pages":"579 - 585"},"PeriodicalIF":1.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579411","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

Photocatalysis for Energy, Environmental Protection, and Sustainable Development 光催化技术促进能源、环境保护和可持续发展

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-11-04 DOI: 10.1134/S0023158424601955

Editorial Board

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Oxygen-Free Reforming of Methane into Synthesis Gas in the Presence of H2, H2O, CO, and CO2 Additives Taking into Account the Formation of Soot Particles 考虑到烟尘颗粒的形成，在有 H2、H2O、CO 和 CO2 添加剂的情况下将甲烷无氧转化为合成气

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2024-11-04 DOI: 10.1134/S0023158424601906

A. R. Akhunyanov, P. A. Vlasov, V. N. Smirnov, A. V. Arutyunov, V. S. Arutyunov

{"title":"Oxygen-Free Reforming of Methane into Synthesis Gas in the Presence of H2, H2O, CO, and CO2 Additives Taking into Account the Formation of Soot Particles","authors":"A. R. Akhunyanov, P. A. Vlasov, V. N. Smirnov, A. V. Arutyunov, V. S. Arutyunov","doi":"10.1134/S0023158424601906","DOIUrl":"10.1134/S0023158424601906","url":null,"abstract":"The kinetic modeling of high-temperature reforming of oxygen-free mixtures of methane with H2, H2O, CO, and CO2 additives into synthesis gas with strong dilution with argon under conditions of variable temperature and the formation of microheterogeneous soot particles was carried out. Such mixtures are typical for biomass gasification products, in which H2O, CO, and CO2 additives act as oxidizing agents. A direct comparison of kinetic calculations with the results of published experiments in a flow reactor at temperatures of 1100–1800 K, atmospheric pressure, and a reaction time of 0.68 s was carried out. The yields of soot were calculated for all test mixtures and conditions. A comparison of the results of kinetic calculations and experiments made it possible to evaluate the effect of soot formation on the reforming of methane with the additions of H2, H2O, CO, and CO2. The work analyzes two ways for carbon atoms to leave a reacting gas-phase system. The first way is the heterogeneous deposition of acetylene molecules from the gas phase onto the surface of the reactor with the subsequent formation of solid carbon, and the second way is the formation of microheterogeneous soot particles from nuclei in the gas phase. The paper compares the results of experiments in reflected shock waves and our kinetic calculations of the absolute concentration of CO for the process of methane oxidation in oxygen-free mixtures of methane and CO2. Mixtures with various CH4/CO2 ratios, 90/10, 75/25, and 50/50, were studied at temperatures above 2200 K and atmospheric pressure. It has been shown that the agreement between the calculated and measured CO concentrations improved with increasing temperature and CO2 fraction in the mixture.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 5","pages":"421 - 439"},"PeriodicalIF":1.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142579428","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