Hydrogen production by steam reforming of dimethyl ether over ZnO-Al₂O₃ bi-functional catalyst

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• 作者：Mei Yang^a ; ^b ; Yong Men^a ; Shulian Li^a ; Guangwen Chen^a ; ^{gwchen@dicp.ac.cn}
• 关键词：Dimethyl ether ; H2 production ; Bi-functional catalyst ; ZnAl2O4 ; Steam reforming
• 刊名：International Journal of Hydrogen Energy
• 出版年：2012
• 期刊代码：42_03603199
• 类别：ch
• 出版时间：May, 2012
• 卷：37
• 期：10
• 页码：8360-8369
• 文件大小：1106 K

摘要

A series of ZnO-Al₂O₃ catalysts with various ZnO/(ZnO聽+聽Al₂O₃) molar ratios have been developed for hydrogen production by dimethyl ether (DME) steam reforming within microchannel reactor. The catalysts were characterized by N₂ adsorption-desorption, X-ray diffraction and temperature programmed desorption of NH₃. It was found that the catalytic activity was strongly dependent on the catalyst composition. The overall DME reforming rate was maximized over the catalyst with ZnO/(ZnO聽+聽Al₂O₃) molar ratio of 0.4, and the highest H₂ space time yield was 315聽mol聽h^鈭?路kg_cat^鈭? at 460聽掳C. A bi-functional mechanism involving catalytic active site coupling has been proposed to account for the phenomena observed. An optimized bi-functional DME reforming catalyst should accommodate the acid sites and methanol steam reforming sites with a proper balance to promote DME steam reforming, whereas all undesired reactions should be impeded without sacrificing activity. This work suggests that an appropriate catalyst composition is mandatory for preparing good-performance and inexpensive ZnO-Al₂O₃ catalysts for the sustainable conversion of DME into H₂-rich reformate.