Comparative Study of Structural Properties of Bulk and Aluminum Oxide Supported Ce1–xNixOy Oxides

IF 1.2 4区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR

Journal of Structural Chemistry Pub Date : 2024-10-02 DOI:10.1134/S0022476624090026

E. V. Matus, E. N. Kovalenko, A. V. Kapishnikov, A. A. Leonova, A. P. Nikitin, O. A. Stonkus, V. A. Ushakov, S. A. Yashnik, O. B. Sukhova, M. A. Kerzhentsev

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Abstract

A comparative analysis of the properties of bulk and aluminum oxide supported Ce_1–xNi_xO_y oxides (x = 0.2-0.8; y = 1.2-1.8) exhibiting catalytic activity in reforming reactions is performed using a complex of physical and chemical methods (thermal analysis, low-temperature nitrogen adsorption, powder XRD, Raman spectroscopy, electron microscopy, hydrogen temperature-programmed reduction). It is shown that the obtained samples are mesoporous materials with a specific surface area of 100±10 m²/g, containing substitutional solid solutions with fluorite cubic structure in their composition. In contrast to bulk Ce_1–xNi_xO_y complex oxide samples, the Ce_1–xNi_xO_y/Al₂O₃ material exhibits resistance to sintering during high temperature treatments in the course of activation and the subsequent reaction. At the same time, the formation temperature of metal Ni particles increases (540 °C vs. 350 °C) and the dispersion of the Ni⁰ phase after the reaction is preserved (6.5 nm vs. 50 nm). A relationship between characteristics of these materials and their functional properties is revealed.

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块状和氧化铝支撑 Ce1-xNixOy 氧化物结构特性的比较研究

采用多种物理和化学方法（热分析、低温氮吸附、粉末 XRD、拉曼光谱、电子显微镜、氢气温度编程还原）对重整反应中具有催化活性的块状和氧化铝支撑 Ce1-xNixOy 氧化物（x = 0.2-0.8; y = 1.2-1.8）的性质进行了比较分析。结果表明，获得的样品是比表面积为 100±10 m2/g 的介孔材料，其成分中含有萤石立方结构的置换固溶体。与块状 Ce1-xNixOy 复合氧化物样品相比，Ce1-xNixOy/Al2O3 材料在活化和后续反应过程中的高温处理过程中表现出抗烧结性。同时，金属镍颗粒的形成温度升高（540 °C 对 350 °C），反应后镍0相的分散度保持不变（6.5 nm 对 50 nm）。这揭示了这些材料的特征与其功能特性之间的关系。

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来源期刊

Journal of Structural Chemistry 化学-无机化学与核化学

CiteScore

1.60

自引率

12.50%

发文量

142

审稿时长

8.3 months

期刊介绍： Journal is an interdisciplinary publication covering all aspects of structural chemistry, including the theory of molecular structure and chemical bond; the use of physical methods to study the electronic and spatial structure of chemical species; structural features of liquids, solutions, surfaces, supramolecular systems, nano- and solid materials; and the crystal structure of solids.