Role of ZnNb2O6 in ZnO-promoted amorphous-Nb2O5 supported Ru catalyst for the partial hydrogenation of benzene

催化作用 无机化学 X射线光电子能谱 程序升温还原 化学 氧化铌 环己烯 煅烧 化学吸附 解吸 无定形固体 初湿浸渍 选择性 核化学 氧化物 吸附 化学工程 有机化学 工程类
作者
Gabriel Pereira da Costa,Arthur Henrique A. Gonçalves,L.A.V. Viana,João Carlos S. Soares,Fábio B. Passos,Fernanda de Souza Nogueira Sardinha Mendes,Alexandre B. Gaspar
出处
期刊:Materials Today Chemistry [Elsevier BV]
卷期号:19: 100397-100397 被引量:5
标识
DOI:10.1016/j.mtchem.2020.100397
摘要

Ruthenium catalysts supported on zinc-promoted amorphous-niobium mixed oxides were prepared, characterized, and studied in the additive-free partial hydrogenation of benzene reaction. The amorphous matrix of Nb2O5 was responsible for a highly active Ru/Nb2O5 catalyst, although less selective than those containing zinc. The ZnO-containing supports were prepared by wet impregnation technique, followed by incipient wetness of ruthenium chloride salt. The catalysts were characterized by textural analysis, X-ray fluorescence, X-ray diffraction, H2 chemisorption, temperature-programmed reduction (TPR), Scanning electron microscopy, H2 temperature-programmed desorption, and X-ray photoelectron spectroscopy (XPS) of the calcined-reduced samples. Chlorine retention was observed on zinc-containing samples. An unexpected ZnNb2O6 oxide phase, ascribed to a selectivity increase with less activity loss, was obtained for the supports at lower temperatures than those related on the literature. A very complex electronic environment of Ru- and Zn-containing species interactions was observed by TPR. The presence of surface-reduced (Ru0) and partially reduced (Ruδ+) Ru species observed by XPS justified well, respectively, the activity and selectivity achieved with every catalyst. The addition of water as a solvent resulted in very constant yield to cyclohexene, as expected, despite activity diminution due to low solubility of the reactants.
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