Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (05): 1296-1304.doi: 10.3866/PKU.WHXB20100322

• CATALYSIS AND SURFACE STRUCTURE • Previous Articles     Next Articles

Dimethyl Ether Steam Reforming for Hydrogen Production over Cu-Ni/γ-Al2O3 Bi-Functional Catalyst

WANG Xiao-Lei, PAN Xiang-Min, LIN Rui, KOU Su-Yuan, ZOU Wei-Bing, MA Jian-Xin   

  1. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, P. R. China; Clean Energy Automotive Engineering Center, Tongji University, Shanghai 201804, P. R. China; School of Automotive Studies, Tongji University, Shanghai 201804, P. R. China; Shool of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China
  • Received:2009-09-16 Revised:2009-11-30 Published:2010-04-29
  • Contact: MA Jian-Xin E-mail:jxma@tongji.edu.cn

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Abstract:

Cu/γ-Al2O3, Ni/γ-Al2O3, and Cu-Ni/γ-Al2O3 catalysts were prepared using the deposition-precipitation method and the catalytic performances for hydrogen production during dimethyl ether steam reforming(DME SR) were investigated. The structure and surface characteristics of these catalysts were analyzed by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), H2 temperature-programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), NH3 temperature-programmed desorption (NH3-TPD), temperature-programmed oxidation (TPO), and transmission electron microscopy (TEM). It was revealed that both copper and nickel were active components during DME SR and there were interactions among Cu, Ni, and γ-Al2O3. Nickel addition improved copper dispersion to obtain small copper crystallites, and strengthened the interaction between copper and γ-Al2O3 so as to prevent copper agglomeration. Copper addition also improved nickel dispersion and the smaller nickel particle size suppressed CH4 formation, which prevented coke formation. Therefore, Cu-Ni/γ-Al2O3 with superior catalytic activity and stability was obtained. During 100 h durability testing, the Cu-Ni/γ-Al2O3 maintained about 95% DME conversion and did not show obvious deactivation.

Key words: Copper, Nickel, Alumina, Dimethyl ether steamreforming, Hydrogen production, Stability