Low-Temperature O3-Catalytic Oxidation of Methane on Cobalt-Containing Zeolite Catalysts

IF 1.3 4区化学 Q4 CHEMISTRY, PHYSICAL

Kinetics and Catalysis Pub Date : 2024-09-04 DOI:10.1134/S0023158424601736

D. A. Bokarev, I. V. Paramoshin, S. A. Kanaev, G. N. Baeva, A. V. Rassolov, A. Yu. Stakheev

引用次数: 0

Abstract

The Co/BEA zeolite catalyst was found to exhibit exceptionally high activity in ozone catalytic oxidation (OZCO) of methane impurities in air, and it provided CH₄ conversion >85% in the temperature range 90–170°С at a high gas hourly space velocity (100 000 h^–1). A comparative study of the catalytic performance of 0.5% Co/BEA, 5% Co/BEA, and 5% Co/SiO₂ samples was performed for elucidating the nature of the active sites on which the process takes place. The comparison of the catalytic data with the results of catalyst characterization by electron microscopy, UV spectroscopy, X-ray diffraction analysis, and temperature-programmed reduction allowed us to conclude that the active sites of low-temperature methane oxidation are Co²⁺ ions located in the cationic positions of the zeolite framework, and the 0.5% Co/BEA catalyst had the highest activity in methane oxidation.

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含钴沸石催化剂对甲烷的低温 O3 催化氧化作用

摘要研究发现，Co/BEA沸石催化剂在臭氧催化氧化（OZCO）空气中的甲烷杂质时表现出极高的活性，在90-170°С温度范围内，气体时空速度高（100 000 h-1）时，CH4转化率达85%。对 0.5% Co/BEA、5% Co/BEA 和 5% Co/SiO2 样品的催化性能进行了比较研究，以阐明发生催化过程的活性位点的性质。通过将催化数据与电子显微镜、紫外光谱、X 射线衍射分析和温度编程还原等催化剂表征结果进行比较，我们得出结论：低温甲烷氧化的活性位点是位于沸石框架阳离子位置的 Co2+ 离子，0.5% Co/BEA 催化剂的甲烷氧化活性最高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Kinetics and Catalysis 化学-物理化学

CiteScore

2.10

自引率

27.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Kinetics and Catalysis Russian is a periodical that publishes theoretical and experimental works on homogeneous and heterogeneous kinetics and catalysis. Other topics include the mechanism and kinetics of noncatalytic processes in gaseous, liquid, and solid phases, quantum chemical calculations in kinetics and catalysis, methods of studying catalytic processes and catalysts, the chemistry of catalysts and adsorbent surfaces, the structure and physicochemical properties of catalysts, preparation and poisoning of catalysts, macrokinetics, and computer simulations in catalysis. The journal also publishes review articles on contemporary problems in kinetics and catalysis. The journal welcomes manuscripts from all countries in the English or Russian language.