Kinetics and Catalysis最新文献_第5页

Unraveling the Mechanism of Hydrogen Evolution on Dark TiO2 Obtained by Pulsed Laser Ablation 脉冲激光烧蚀法制备深色TiO2的析氢机理研究

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602043

E. D. Fakhrutdinova, E. V. Zinina, T. A. Bugrova, O. A. Reutova, V. A. Svetlichnyi, O. V. Vodyankina

{"title":"Unraveling the Mechanism of Hydrogen Evolution on Dark TiO2 Obtained by Pulsed Laser Ablation","authors":"E. D. Fakhrutdinova, E. V. Zinina, T. A. Bugrova, O. A. Reutova, V. A. Svetlichnyi, O. V. Vodyankina","doi":"10.1134/S0023158424602043","DOIUrl":"10.1134/S0023158424602043","url":null,"abstract":"The influence of structural defects in TiO2-based photocatalysts, prepared by pulsed laser ablation (Nd:YAG laser: λ 1064 nm, 180 mJ, 7 ns, 20 Hz) followed by thermal treatment in He and air, on the photocatalytic hydrogen evolution was studied. The phase composition and optical properties of the samples were determined by X-ray diffraction, Raman spectroscopy, and diffuse reflectance spectroscopy at all stages of preparation and processing. Photostimulation of dark TiOx samples revealed the appearance of absorption associated with the presence of oxygen vacancies (VO)/Ti3+ ions. A temperature-programmed oxidation (TPO) study of the sample surface in a flow of 10% O2 in helium showed that the defects in the structure of titania were resistant to reoxidation with oxygen. According to the photocatalytic activity data in the hydrogen evolution reaction under LED irradiation at 375 nm, the high concentration of volume and surface defects in dark titanium dioxide prepared by pulsed laser ablation plays a more significant role in the process of photocatalytic hydrogen evolution than the ordered structure formed in TiO2. The maximum efficiency was achieved due to the partial ordering of the dark TiO2-400 structure as a result of heat treatment in air at 400°C with preservation of volume defects. Modification of the defective TiO2-400 support with platinum by chemical and photoreduction methods showed that the defective structure of the support led to high dispersion of Pt and a ~77-fold increase in the apparent quantum yield during H2 photoevolution regardless of the modification method. An additional increase in activity is associated with the strong metal–support interaction (SMSI) effect, which facilitates electron transfer from defects in the TiO2-400 structure to Pt subnanoclusters.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 6","pages":"695 - 702"},"PeriodicalIF":1.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481047","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

Soot Oxidation Kinetics on Nickel Oxide: Effects of Various Synthesis Techniques 烟尘氧化镍的动力学：不同合成工艺的影响

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424601761

Sunaina Shivasharan Patil, Hari Prasad Dasari, Pattanashetti Gouramma, Harshini Dasari

{"title":"Soot Oxidation Kinetics on Nickel Oxide: Effects of Various Synthesis Techniques","authors":"Sunaina Shivasharan Patil, Hari Prasad Dasari, Pattanashetti Gouramma, Harshini Dasari","doi":"10.1134/S0023158424601761","DOIUrl":"10.1134/S0023158424601761","url":null,"abstract":"Nickel oxide (NiO) nanoparticles were synthesized using four different methods: microwave co-precipitation (MCP), solution combustion synthesis (SCS), direct nitrate calcination (DNC), and the sol-gel process (SGP), incorporating organic additives such as glucose and fructose. X-ray diffraction and Raman spectroscopy analyses revealed that the NiO nanoparticles formed a face-centered cubic phase characterized by Ni–O bond stretching. The SCS method produced NiO nanoparticles with higher lattice strain, smaller crystallite size, and an increased facet ratio ({110}) compared to the other methods. Transmission electron microscopy indicated that the order of nano-agglomeration size for the NiO nanoparticles was DNC > MCP > SGP > SCS. The NiO nanoparticles synthesized via SCS, SGP and MCP exhibited irregular hexagonal shapes. Among the synthesized nanoparticles, those produced by the SCS method demonstrated the highest catalytic activity (T50 = 478°C), followed by DNC (T50 = 492°C), MCP (T50 = 495°C), and SGP (T50 = 538°C). A kinetic study was conducted to evaluate key parameters, including activation energy, preexponential factor, and reaction model. The experimental curves of soot conversion were compared with theoretical curves derived from the evaluated kinetic parameters. The NiO nanoparticles synthesized via SCS exhibited the highest kinetic activity with the enhanced reaction rate at lower temperatures.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 6","pages":"775 - 787"},"PeriodicalIF":1.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481071","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

Synthesis of Effective NiO/Ni/g-C3N4 Photocatalysts for CO2 Reduction under Visible Light Irradiation 可见光下NiO/Ni/g-C3N4光催化剂的合成

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602699

K. O. Potapenko, A. Yu. Kurenkova, D. D. Mishchenko, E. Yu. Gerasimov, Enkhsaruul Byambajav, E. A. Kozlova

{"title":"Synthesis of Effective NiO/Ni/g-C3N4 Photocatalysts for CO2 Reduction under Visible Light Irradiation","authors":"K. O. Potapenko, A. Yu. Kurenkova, D. D. Mishchenko, E. Yu. Gerasimov, Enkhsaruul Byambajav, E. A. Kozlova","doi":"10.1134/S0023158424602699","DOIUrl":"10.1134/S0023158424602699","url":null,"abstract":"Photocatalytic reduction of CO2 is one of the promising strategies for synthesising valuable organic compounds and solving both energy and environmental problems. In the present work, NiO/Ni/g-C3N4 photocatalysts were synthesised. Initially, g-C3N4 was prepared by calcination of melamine and urea and then modified by photodeposition of a NiO/Ni co-catalyst on its surface. The structure of the photocatalysts was confirmed by X-ray phase analysis, UV–Vis diffuse reflection spectroscopy, and high-resolution transmission electron microscopy. The highest activity in the reaction of photocatalytic CO2 reduction was demonstrated by 2 wt % (NiO/Ni)/g-C3N4 and 3 wt % (NiO/Ni)/g-C3N4, equal to 13.2 and 12.4 μmol g–1 h–1, respectively. It is worth noting that in this case, an almost 3-fold increase in the reaction rate was achieved compared to the pristine g-C3N4. The deposition of NiO/Ni on g-C3N4 solves two fundamental problems: adsorption of CO2 and separation of photogenerated electrons and holes. The present work demonstrates an approach to the synthesis of active catalysts, in particular an approach to design a hybrid NiO/Ni co-catalyst for efficient photocatalytic CO2 conversion.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 6","pages":"724 - 732"},"PeriodicalIF":1.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481288","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

Influence of Synthesis Conditions of Nanosized Titanium Dioxide on the Structure and Phase Composition 纳米二氧化钛合成条件对其结构和相组成的影响

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602389

A. A. Sushnikova, A. A. Valeeva, A. V. Zhurenok, I. S. Sipatov, A. A. Rempel

引用次数: 0

Radical Chain Oxidation of Methyl Oleate as a Model System for Studying the Activity and Concentration of Antioxidants in Evening Primrose Oil and Borage Seed Oil 油酸甲酯自由基链氧化作为研究月见草油和琉璃苣籽油抗氧化剂活性和浓度的模型体系

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602419

L. R. Yakupova, R. L. Safiullin

引用次数: 0

Piezo-Enhanced Photocatalytic Activity of BaTiO3-Doped Polyvinylidene Fluoride Nanofibers 压电增强batio3掺杂聚偏氟乙烯纳米纤维的光催化活性

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602407

D. A. Selimov, A. A. Rabadanova, A. O. Shuaibov, A. G. Magomedova, M. G. Abdurakhmanov, R. R. Gulakhmedov, Sh. M. Ramazanov, A. A. Amirov, D. S. Sobola, F. F. Orudzhev

{"title":"Piezo-Enhanced Photocatalytic Activity of BaTiO3-Doped Polyvinylidene Fluoride Nanofibers","authors":"D. A. Selimov, A. A. Rabadanova, A. O. Shuaibov, A. G. Magomedova, M. G. Abdurakhmanov, R. R. Gulakhmedov, Sh. M. Ramazanov, A. A. Amirov, D. S. Sobola, F. F. Orudzhev","doi":"10.1134/S0023158424602407","DOIUrl":"10.1134/S0023158424602407","url":null,"abstract":"In recent decades, with population growth and rapid industrialization, the contamination of water resources has become a pressing concern, with organic pollutants, heavy metals, and other complex compounds playing a significant role. Consequently, the development of novel materials that can harness natural energy and employ it for wastewater treatment represents a crucial objective. In this study, a PVDF/BaTiO3 composite membrane was synthesized via the electrospinning method. The synthesized materials were subjected to investigation by means of scanning electron microscopy (SEM), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The incorporation of BaTiO3 resulted in a notable reduction in fiber diameter, with a 2.9-fold decrease observed. Fourier transform infrared spectroscopy (FTIR) revealed that the β-phase fraction decreased from 87.3 to 74.3%, while the γ‑polymorph increased from 10.7 to 20.9%. The catalytic properties of the composite were investigated by subjecting it to the decomposition of methylene blue. The photocatalytic process yielded 61% decomposition, the piezocatalytic process yielded 77% decomposition, and the piezophotocatalytic process (simultaneous exposure to ultrasound and UV-visible light) yielded 98% decomposition in 60 min. The synergetic effect of the two processes was 33.7%. The oxidation mechanism in piezo- and piezophotocatalysis is based on the action of hydroxyl radicals (•OH). Experimental evidence has demonstrated that the membrane generates voltages more than 20 V under ultrasound conditions, thereby promoting silver reduction. These materials have the potential to contribute significantly to the degradation of dyes and the purification of aqueous media, thereby facilitating the development of more efficient and sustainable water treatment methods.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 6","pages":"682 - 694"},"PeriodicalIF":1.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481048","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

Ozone-Enhanced Selective Catalytic Reduction of NOx by Ammonia: A Comparative Study of Fe-Beta and V2O5–WO3/Al2O3 Catalysts 臭氧增强氨选择性催化还原NOx: fe - β和V2O5-WO3 /Al2O3催化剂的比较研究

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602183

D. A. Bokarev, I. V. Paramoshin, G. N. Baeva, G. O. Bragina, A. Yu. Stakheev

引用次数: 0

Erratum to: Effect of K and Ni Promoters on Mo2C/Al2O3 Catalyst for Higher Alcohols Synthesis from Syngas K和Ni促进剂对合成气合成高级醇Mo2C/Al2O3催化剂的影响

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424960012

Zhi Yang, Mingsheng Luo, Qinglong Liu, Chenmeng Li, Yatao Wang, Hongjuan Li, Lifei Yao

引用次数: 0

Photocatalytic Formation of Hydrogen Peroxide in Aqueous Suspensions of Titanium Dioxide Supported with Palladium 钯负载二氧化钛水悬浮液中过氧化氢的光催化生成

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602432

T. R. Fazliev, A. V. Bukhtiyarov, D. S. Selishchev

引用次数: 0

Study of Catalytic Activity of Graphitic Carbon Nitride in Photocatalytic Hydrogen Evolution: Comparison of Modification Approaches with One and Two Different Halogens 石墨氮化碳光催化析氢活性的研究：一种和两种不同卤素改性方法的比较

IF 1.3 4区化学

Kinetics and Catalysis Pub Date : 2025-02-25 DOI: 10.1134/S0023158424602390

A. V. Zhurenok, D. V. Markovskaya, V. A. Lomakina, A. A. Saraev, E. Yu. Gerasimov, E. A. Kozlova

{"title":"Study of Catalytic Activity of Graphitic Carbon Nitride in Photocatalytic Hydrogen Evolution: Comparison of Modification Approaches with One and Two Different Halogens","authors":"A. V. Zhurenok, D. V. Markovskaya, V. A. Lomakina, A. A. Saraev, E. Yu. Gerasimov, E. A. Kozlova","doi":"10.1134/S0023158424602390","DOIUrl":"10.1134/S0023158424602390","url":null,"abstract":"In this work, graphitic carbon nitride samples modified simultaneously with bromine and iodine were prepared using a two-step synthesis method. The composition and physicochemical properties of the prepared samples were investigated by a set of physicochemical methods including X-ray diffraction (XRD) analysis, low-temperature nitrogen adsorption, diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), thermal analysis, cyclic voltammetry, and impedance spectroscopy. The catalytic properties of the synthesized samples were measured under the illumination of an aqueous alkaline solution of triethanolamine. The samples simultaneously modified with bromine and iodine showed higher catalytic activity compared to the samples modified with bromine or iodine alone. A maximum catalytic activity of 2400 μmol h–1 g–1 was obtained in the presence of a 0.5% Pt/0.4Br–0.1I sample. Cyclic experiments showed that the samples modified with bromine or iodine alone showed higher photostability, as a result of which modification with one halogen allows the process of photocatalytic hydrogen evolution to be carried out with higher efficiency.","PeriodicalId":682,"journal":{"name":"Kinetics and Catalysis","volume":"65 6","pages":"649 - 662"},"PeriodicalIF":1.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481050","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