Kinetics and Catalysis最新文献_第6页

Kinetic Aspects of Photocatalytic Decomposition of Rhodamine B in an Aqueous Solution Using a TiO2–Montmorillonite Composite 二氧化钛-蒙脱土复合材料光催化分解罗丹明B的动力学研究

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-10 DOI: 10.1134/S002315842560066X

N. L. Ovchinnikov, D. V. Yashin, D. S. Selishchev, M. F. Butman

{"title":"Kinetic Aspects of Photocatalytic Decomposition of Rhodamine B in an Aqueous Solution Using a TiO2–Montmorillonite Composite","authors":"N. L. Ovchinnikov, D. V. Yashin, D. S. Selishchev, M. F. Butman","doi":"10.1134/S002315842560066X","DOIUrl":"10.1134/S002315842560066X","url":null,"abstract":"The kinetics of photocatalytic decomposition of rhodamine B dye in aqueous solutions with initial concentrations of 20, 25, 30, 35, and 40 mg/L was studied using a TiO2–montmorillonite composite photocatalyst with high adsorption capacity and photoactivity. The experimental data were analyzed based on the pseudo-second-order and Langmuir–Hinshelwood (L–H) models. In all cases, the apparent reaction order was less than unity, and the half-life of the dye molecules increased monotonically with increasing dye concentration in the solution. Based on the Langmuir adsorption isotherm obtained for the “dark” period, the equilibrium adsorption constant KL was determined, which is in good agreement with the adsorption parameter Ka of the L–H model, indicating the adequacy of this model for photocatalysts with high adsorption capacity. The use of equations representing the analytical solution of the L–H equation based on perturbation iteration method algorithms makes it possible to solve the direct kinetic problem for a photocatalytic experiment with high accuracy.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 4","pages":"433 - 439"},"PeriodicalIF":1.4,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145479694","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

Micellar Catalysis of Alkaline Hydrolysis of Phosphoric and Carboxylic Acid Esters in Solutions of Piperidinium Carbamate-Containing Surfactants 含氨基甲酸胡椒啶表面活性剂溶液中磷酸酯和羧酸酯的胶束催化碱性水解

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-10 DOI: 10.1134/S0023158425600579

E. P. Zhiltsova, F. G. Valeeva, D. M. Kuznetsov, D. D. Bekrenev, R. A. Kushnazarova, E. A. Vasilieva, L. Ya. Zakharova

{"title":"Micellar Catalysis of Alkaline Hydrolysis of Phosphoric and Carboxylic Acid Esters in Solutions of Piperidinium Carbamate-Containing Surfactants","authors":"E. P. Zhiltsova, F. G. Valeeva, D. M. Kuznetsov, D. D. Bekrenev, R. A. Kushnazarova, E. A. Vasilieva, L. Ya. Zakharova","doi":"10.1134/S0023158425600579","DOIUrl":"10.1134/S0023158425600579","url":null,"abstract":"The process of alkaline hydrolysis of the organophosphorus ecotoxicant paraoxon and carboxylic acid esters in micellar solutions of piperidinium carbamate-containing surfactants was studied using spectrophotometry. The influence of concentration and structural factors, as well as the holding time of surfactant solutions, on the catalytic effect of the systems was analyzed. During the hydrolytic decomposition of paraoxon, the highest catalytic activity was exhibited by the surfactant with a carbamate fragment at the quaternary nitrogen atom in the cycle (1-CB(Et)-P-16). The increase in the catalytic response for aged solutions of this surfactant was explained by its partial hydrolysis in a highly alkaline medium and the formation of a mixed system of 1-CB(Et)-P-16 with the product of its decomposition, 1-hexadecyl-1-(2-hydroxyethyl)piperidinium bromide. The formation of the latter was confirmed by 1H NMR spectroscopy. In neutral solutions, the decomposition of piperidinium carbamate-containing surfactants did not occur for more than three to four months, indicating their hydrolytic stability under these conditions. In micellar catalysis of alkaline hydrolysis of carboxylic acid esters, a favorable effect of an increase in the hydrophobicity of the substrate (from p-nitrophenyl acetate to p-nitrophenyl caprate) and an alkyl substituent in the carbamate fragment of the amphiphile was established.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 4","pages":"379 - 389"},"PeriodicalIF":1.4,"publicationDate":"2025-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145479574","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

In Situ SAXS Study of the Formation of Palladium Polynuclear Hydroxo Complexes 钯多核羟基络合物形成的原位SAXS研究

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-10 DOI: 10.1134/S0023158425600294

Yu. V. Larichev

引用次数: 0

The Mechanism of Formation of Trimethylpentanes from Esters in Liquid-Phase Alkylation of Isobutane with Butenes 异丁烷与丁烯液相烷基化反应中酯生成三甲基戊烷的机理

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-10 DOI: 10.1134/S0023158425600798

E. A. Katsman

引用次数: 0

Enhanced Acrylic Acid Production via Liquid-Phase Glycerol Oxydehydration Using SBA-15 Supported Heteropoly Phosphotungstic Acid Catalysts: Experimental Evaluation, Mechanistic Understanding, and Kinetic Modelling SBA-15负载的杂多磷钨酸催化剂通过液相甘油氧脱水增强丙烯酸生产：实验评价、机理理解和动力学建模

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-08 DOI: 10.1134/S0023158425600713

Muhammad Yusri Ahmad, Syamima Nasrin Mohamed Saleh, Anwar Ul-Hamid, Ahmad Zuhairi Abdullah

{"title":"Enhanced Acrylic Acid Production via Liquid-Phase Glycerol Oxydehydration Using SBA-15 Supported Heteropoly Phosphotungstic Acid Catalysts: Experimental Evaluation, Mechanistic Understanding, and Kinetic Modelling","authors":"Muhammad Yusri Ahmad, Syamima Nasrin Mohamed Saleh, Anwar Ul-Hamid, Ahmad Zuhairi Abdullah","doi":"10.1134/S0023158425600713","DOIUrl":"10.1134/S0023158425600713","url":null,"abstract":"The expansion of the oleochemical industry results in excess glycerol production to the extent it is regarded as a waste. This drives the exploration of value-added products like acrylic acid to address the surplus and associated environmental issues. However, current processes mainly focus on the gaseous phase, requiring high temperatures and complex setups. Although some research delves into liquid-phase glycerol oxydehydration, information remains limited. In this study, SBA-15 supported heteropoly phosphotungstic acid (HPW) catalysts (PW/SBA-15) with varied acid loadings (10–40 wt %) were synthesized for a single-step liquid-phase glycerol oxydehydration. The impact of calcination temperatures (400–700°C) on catalyst properties and activity was explored. Extensive characterization techniques were employed to assess surface, morphological, and structural properties. Optimal conditions were identified: 3 h reaction time, 240°C reaction temperature, and 10 wt % catalyst loading, achieving 98.7% glycerol conversion and 22.5% acrylic acid yield. Glycerol oxydehydration followed a pseudo second-order kinetic model with an activation energy of 134.4 kJ/mol. The 30PW/SBA-15 catalyst exhibited a defined structure, effectively catalyzing glycerol-to-acrylic acid oxydehydration due to strong acid sites and appropriate redox sites.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 5","pages":"528 - 543"},"PeriodicalIF":1.4,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729591","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

Honeycomb Supported LaFe1 – xNixO3 (x = 0, 0.6, 1) Perovskite Catalysts for High-Temperature N2O Decomposition 蜂窝负载的LaFe1 - xNixO3 （x = 0,0.6, 1）钙钛矿高温N2O分解催化剂

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-08 DOI: 10.1134/S0023158425600634

L. A. Isupova, Yu. A. Ivanova, A. N. Salanov

{"title":"Honeycomb Supported LaFe1 – xNixO3 (x = 0, 0.6, 1) Perovskite Catalysts for High-Temperature N2O Decomposition","authors":"L. A. Isupova, Yu. A. Ivanova, A. N. Salanov","doi":"10.1134/S0023158425600634","DOIUrl":"10.1134/S0023158425600634","url":null,"abstract":"Using the Pechini method, LaFe1 – xNixO3 (x = 0, 0.6, 1) perovskite-containing catalysts supported on a monolith corundum support were prepared and studied in the reaction of high-temperature decomposition of nitrous oxide. It is shown that the supported catalysts can be arranged in the following order by activity: LaFeO3/α-Al2O3 > LaFe0.4Ni0.6O3/α-Al2O3 > LaNiO3/α-Al2O3, which differs from the activity order of perovskites without a support. The change in the activity order is due to the interaction of the impregnating solution with the support, as a result of which an admixture of the nickel aluminate phase, inactive in this reaction, can be formed in nickel-containing catalysts. The LaFeO3/α-Al2O3 catalyst with an active component content of ~5%, even with a fragment height of 20 mm (and a contact time of 0.06 s), provides a high (~84%) conversion of nitrous oxide, due to the possible presence of an impurity of the dispersed phase of active Fe2O3 as well.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 5","pages":"511 - 520"},"PeriodicalIF":1.4,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729668","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

Enhanced Hydrodesulfurization of Diesel Using Novel RN/γ-Al2O3@CNTs Catalyst 新型RN/γ-Al2O3@CNTs催化剂强化柴油加氢脱硫

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-08 DOI: 10.1134/S0023158425600592

Asfar Ali, Saghir Hussain, Waqar Ahmad, Khalid Mahmood, Artem S. Belousov, Hina Ghafoor, Murid Hussain, Iqrash Shafiq

{"title":"Enhanced Hydrodesulfurization of Diesel Using Novel RN/γ-Al2O3@CNTs Catalyst","authors":"Asfar Ali, Saghir Hussain, Waqar Ahmad, Khalid Mahmood, Artem S. Belousov, Hina Ghafoor, Murid Hussain, Iqrash Shafiq","doi":"10.1134/S0023158425600592","DOIUrl":"10.1134/S0023158425600592","url":null,"abstract":"Combustion of fossil fuels releases harmful pollutants, particularly sulfur-containing compounds such as alkyl mercaptans, sulfides, disulfides, and thiophenes present in diesel fuel. These pollutants pose significant environmental, health, and economic challenges. Hydrodesulfurization (HDS) using heterogeneous catalysts is a widely employed refinery technique to remove sulfur from diesel. In this study, a novel RN/γ-Al2O3@CNTs catalyst was synthesized by incorporating 15% Raney nickel (RN), resulting in a high surface area of approximately 129 m2/g. The catalyst’s HDS performance was evaluated using diesel fuel containing 0.98% sulfur. For comparison, a RN/γ-Al2O3 catalyst was also prepared. The RN/γ-Al2O3@CNTs catalyst achieved a superior sulfur removal efficiency of 92% in batch HDS tests, significantly outperforming the 80% efficiency of RN/γ-Al2O3. These results highlight the potential of RN/γ-Al2O3@CNTs as an effective heterogeneous catalyst for improved diesel desulfurization, contributing to reduced environmental pollution.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 5","pages":"496 - 510"},"PeriodicalIF":1.4,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729669","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

Modeling the Role of Hydrogen Strategies in Mitigating Unburned Ammonia and Carbonyl Pollutants from Ammonia/Methanol Combustion 模拟氢策略在减少氨/甲醇燃烧中未燃烧的氨和羰基污染物中的作用

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-08 DOI: 10.1134/S0023158425600373

Malak Djermane, Yacine Rezgui, Miloud Guemini, Ammar Tighezza

{"title":"Modeling the Role of Hydrogen Strategies in Mitigating Unburned Ammonia and Carbonyl Pollutants from Ammonia/Methanol Combustion","authors":"Malak Djermane, Yacine Rezgui, Miloud Guemini, Ammar Tighezza","doi":"10.1134/S0023158425600373","DOIUrl":"10.1134/S0023158425600373","url":null,"abstract":"This study numerically investigated the effectiveness of direct hydrogen addition versus ammonia cracking in reducing unburned ammonia and carbonyl pollutant emissions during ammonia/methanol combustion. Simulation using a modified Chemkin II/Premic code examined equivalence ratios from 0.7 to 1.2 and hydrogen incorporation levels up to 60%. Direct hydrogen addition increased unburned NH3 emissions by 196% under lean conditions (Φ = 0.7) but only 42% under rich conditions (Φ = 1.2), while ammonia cracking reduced NH3 emissions by up to 17 000-fold. Formaldehyde decreased by 45.9% (Φ = 1) with hydrogen addition, outperforming ammonia cracking (28% reduction), due to H-radical-driven consumption. Acetaldehyde emissions follow a U-shaped trend increasing under lean conditions, but decreasing in fuel-rich environments, with direct hydrogen addition achieving a 19% reduction at Φ = 1.2. These findings highlight a trade-off between hydrogen strategies, with ammonia cracking better suited for minimizing unburned ammonia and direct hydrogen addition more effective at reducing carbonyl compounds. Optimizing hydrogen enrichment in ammonia/methanol combustion is crucial for balancing emission control and combustion efficiency in future sustainable fuel applications.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 5","pages":"463 - 477"},"PeriodicalIF":1.4,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729590","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

Coprecipitation Method for Preparing Cobalt Oxide (Co3O4) Catalyst to Efficiently Oxidize Ammonia 共沉淀法制备高效氧化氨的氧化钴催化剂

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-11-08 DOI: 10.1134/S0023158424602729

Mudar Al-Okla, Hani Zeidan

{"title":"Coprecipitation Method for Preparing Cobalt Oxide (Co3O4) Catalyst to Efficiently Oxidize Ammonia","authors":"Mudar Al-Okla,  Hani Zeidan","doi":"10.1134/S0023158424602729","DOIUrl":"10.1134/S0023158424602729","url":null,"abstract":"In this study three samples of cobalt oxide were prepared via coprecipitation at pH 9.5 using cobalt nitrate as a precursor. They were dried at 120°C before calcining at 400, 500, and 600°C. The crystalline phases were determined using X-ray diffraction (XRD), revealing the presence of the Co3O4 phase in all prepared samples in varying proportions. Fourier Transform Infrared Spectroscopy (FTIR) spectra showed distinct bands corresponding to the vibrational motion of the Co–O bond, confirming the formation of cobalt oxide (Co3O4). Scanning electron microscope (SEM) analysis of the Co 500 sample revealed particles in the range of 40–350 nm (average ~100 nm) with relatively low agglomeration, while energy-dispersive X-ray spectroscopy (EDX) confirmed a composition consistent with stoichiometric Co3O4 (85.7 wt % Co and 13.6 wt % O). Pyridine-adsorbed FTIR spectra indicated that the sample calcined at 500°C possessed the most balanced ratio of Lewis and Brønsted acid sites, which correlated with its highest catalytic activity. The textural properties of all samples were analyzed using nitrogen adsorption data at 77 K, and the adsorption isotherms were found to be type IV, with hysteresis loops indicating capillary condensation in mesopores. The specific surface area reached a maximum of 4.837 m2/g for the sample calcined at 500°C. This sample also exhibited the highest total acidity (0.035 mmol/g) and strong acidic sites (the initial electrode potential value Ei = 73.2 mV), which enhanced catalytic performance. Pore radius calculations further revealed that the samples contained mesopores. The catalytic efficiency of the prepared samples in the ammonia oxidation reaction was evaluated at 450°C. The sample calcined at 500°C demonstrated the highest catalytic activity. The sample calcined at 500°C achieved 100% NH3 conversion at 475°C and maintained full activity over 10 consecutive cycles, demonstrating high stability and reusability.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"66 5","pages":"552 - 562"},"PeriodicalIF":1.4,"publicationDate":"2025-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729670","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

Effect of Composition and Method of Support Synthesis on the Properties of Pd/MgAlOx Catalyst in Selective Hydrogenation of Benzaldehyde 载体组成及合成方法对苯甲醛选择性加氢Pd/ mgalx催化剂性能的影响

IF 1.4 4区化学

Kinetics and Catalysis Pub Date : 2025-09-19 DOI: 10.1134/S0023158425600178

O. B. Belskaya

引用次数: 0