Promising Directions in Chemical Processing of Methane from Coal Industry. Part 2. Development of Catalysts

IF 0.5 Q4 CHEMISTRY, MULTIDISCIPLINARY Eurasian Chemico-Technological Journal Pub Date : 2023-07-15 DOI:10.18321/ectj1500
Е. Matus, M. Kerzhentsev, A. Nikitin, S. Sozinov, Z. R. Ismagilov
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Abstract

For the creation of new highly active and stable catalysts for the complete processing of coal methane, different methods for designing catalytic systems are being applied, including the use of the effects of mutual strengthening of the action of metals and modifying the composition of the supports. Different chemical synthesis approaches were considered for obtaining supported Ni nanoparticles with controllable compositions and sizes. For the citrate sol-gel method, it was found that with an increase in the citric acid/metals molar ratio from 0 to 1, the textural characteristics (specific surface area: 76→100 m2/g) of Сe0.2Ni0.8O1.2/Al2O3 catalysts, dispersion (average particle size: 10→5 nm) and reducibility (temperature of maximum H2 consumption: 580→530 °C) of the Ni-containing species improved. For calcined in air at 500 °C catalysts it was shown that Ni2+ cations stabilized in NiO or in the Ce-Ni-O solid solution. The proportion of the latter was maximum at a citric acid/metal molar ratio equal to 0.25, which was chosen as the optimal value in the investigated range of 0.25–1.0. An increase in the calcination temperature from 500 to 900 °C contributes to the stabilization of Ni2+ in the Al-Ni-O solid solution, which leads to a slight deterioration in the textural properties of the samples and a significant difficulty in their reducibility. After reductive activation at 800 °C of Сe0.2Ni0.8O1.2/Al2O3 samples, catalytically active metal Nio nanoparticles of ~7 nm in size were formed for effective reforming of coal industry methane into synthesis gas.
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煤炭工业甲烷化学处理的发展方向。第2部分。催化剂的发展
为了创造新的高活性和稳定的催化剂来完全处理煤层气,设计催化系统的不同方法正在被应用,包括利用金属相互加强作用的效果和修改载体的组成。考虑了不同的化学合成方法来获得具有可控成分和尺寸的负载镍纳米颗粒。在柠檬酸溶胶-凝胶法中,发现随着柠檬酸/金属摩尔比从0到1的增加,Сe0.2Ni0.8O1.2/Al2O3催化剂的结构特性(比表面积为76→100 m2/g)、分散性(平均粒径为10→5 nm)和还原性(最大耗氢温度为580→530℃)得到改善。在500℃空气中煅烧的催化剂表明,Ni2+阳离子在NiO或Ce-Ni-O固溶体中稳定。在0.25 ~ 1.0的研究范围内,柠檬酸与金属的摩尔比为0.25时,柠檬酸与金属的摩尔比最大。煅烧温度从500℃提高到900℃,有利于Ni2+在Al-Ni-O固溶体中的稳定,导致样品的织构性能略有下降,其还原性明显困难。Сe0.2Ni0.8O1.2/Al2O3样品经800℃还原活化后,形成了尺寸约7 nm的催化活性金属Nio纳米颗粒,可有效地将煤工业甲烷转化为合成气。
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来源期刊
Eurasian Chemico-Technological Journal
Eurasian Chemico-Technological Journal CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
1.10
自引率
20.00%
发文量
6
审稿时长
20 weeks
期刊介绍: The journal is designed for publication of experimental and theoretical investigation results in the field of chemistry and chemical technology. Among priority fields that emphasized by chemical science are as follows: advanced materials and chemical technologies, current issues of organic synthesis and chemistry of natural compounds, physical chemistry, chemical physics, electro-photo-radiative-plasma chemistry, colloids, nanotechnologies, catalysis and surface-active materials, polymers, biochemistry.
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