CO₂ methanation over TiO₂-Al₂O₃ binary oxides supported Ru catalysts

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• 作者：Jinghua Xu¹ ; ² ; Qingquan Lin³ ; Xiong Su² ; Hongmin Duan² ; Haoran Geng¹ ; ^{mse_genghr@ujn.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yanqiang Huang² ; ^{yqhuang@dicp.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CO2 methanation ; Supported Ru catalyst ; TiO2&ndash ; Al2O3 binary oxide
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：24
• 期：1
• 页码：140-145
• 全文大小：1254 K

文摘

TiO₂ modified Al₂O₃ binary oxide was prepared by a wet-impregnation method and used as the support for ruthenium catalyst. The catalytic performance of Ru/TiO₂–Al₂O₃ catalyst in CO₂ methanation reaction was investigated. Compared with Ru/Al₂O₃ catalyst, the Ru/TiO₂–Al₂O₃ catalytic system exhibited a much higher activity in CO₂ methanation reaction. The reaction rate over Ru/TiO₂–Al₂O₃ was 0.59 mol CO₂·(g Ru)^− 1·h^− 1, 3.1 times higher than that on Ru/Al₂O₃ [0.19 mol CO₂·(g Ru)^− 1·h^− 1]. The effect of TiO₂ content and TiO₂–Al₂O₃ calcination temperature on catalytic performance was addressed. The corresponding structures of each catalyst were characterized by means of H₂-TPR, XRD, and TEM. Results indicated that the averaged particle size of the Ru on TiO₂–Al₂O₃ support is 2.8 nm, smaller than that on Al₂O₃ support of 4.3 nm. Therefore, we conclude that the improved activity over Ru/TiO₂–Al₂O₃ catalyst is originated from the smaller particle size of ruthenium resulting from a strong interaction between Ru and the rutile-TiO₂ support, which hindered the aggregation of Ru nano-particles.