Cu鈥揨n鈥揂l Oxide Cores Packed by Metal-Doped Amorphous Silica鈥揂lumina Membrane for Catalyzing the Hydrogenation of Carbon Dioxide to Dimethyl Ether

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• 作者：Fei Zha ; Jian Ding ; Yue Chang ; Jianfeng Ding ; Jingyuan Wang ; Jian Ma
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：51
• 期：1
• 页码：345-352
• 全文大小：950K
• 年卷期：v.51,no.1(January 11, 2012)
• ISSN：1520-5045

文摘

The direct synthesis of a millimeter-sized core鈥搒hell-like catalyst that can be used in the hydrogenation of carbon dioxide to dimethyl ether was achieved by in situ hydrothermal synthesis. The capsule catalyst exhibited a special core鈥搒hell-like structure of a coprecipitated CuO/ZnO/Al₂O₃ core enwrapped by one layer of metal-doped amorphous silica鈥揳lumina (ASA) membrane and was characterized by XRD, SEM, and thermal analysis. The effects of metal oxide cores and membranes prepared with different precipitants, structure-directing templates, and hydrothermal synthesis conditions, as well as temperatures and pressures, on the catalytic activity of the capsule catalyst for the hydrogenation of CO₂ to dimethyl ether were investigated. Under reaction conditions of a pressure of 3.0 MPa, a space velocity (SV) of 1800 mL路g_cat^鈥?路h^鈥?, a CO₂/H₂ volume ratio of 1:3, and a temperature of 266 掳C, the capsule catalysts with cores coprecipitated by urea using n-butylamine as the templating agent to enwrap the amorphous silica鈥揳lumina membranes had excellent catalytic properties for dimethyl ether synthesis, and the conversion of CO₂ reached 47.1%, with a dimethyl ether yield and selectivity of 19.9% and 42.4%, respectively.