期刊
CATALYSIS TODAY
卷 146, 期 1-2, 页码 87-95出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2008.12.033
关键词
Hydrogen production; Ethanol; NiMo carbide; CO adsorption; XRD; X-ray photoelectron spectroscopy; Temperature-programmed surface reaction
The steam reforming of ethanol over carburized NiMo catalysts was studied to determine the effects of the Ni content, carburization temperature in 20% CH4/H-2, GHSV, potassium addition and a comparison of the reduced catalyst. The catalysts were characterized by CO adsorption, XRD, X-ray electron spectroscopy (XPS) and temperature-programmed surface reaction after ethanol adsorption. The 798 K-carburized NiMo catalyst gradually increased below 500 min and it exhibited a higher activity than the reduced NiMo catalyst. The addition of potassium promoted more hydrogen selectivity than the nonpotassium-added catalysts. The 798 K-carburized catalyst exhibited the high intensity peaks of MoO2 and small peaks Of beta-Mo2C and Ni metal (or NiMo) were present, while the 823 K-carburized catalyst showed broad and small peaks. The 873 and 848 K-carburized catalysts contained a strong intensity of beta-Mo2C and clear Ni metal (or NiMo). The XPS measurements revealed that the hydrogen production was proportional to Ni-0 of the carburized NiMo catalyst. The addition of potassium significantly increases the Ni-0 ratio, which was stabilized instead of increasing the Mo oxidation during the reaction. (C) 2009 Elsevier B.V. All rights reserved.
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