期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 32, 页码 10016-10025出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.05.183
关键词
Hydrogen production; Water-gas shift reaction; Cu catalyst; Layered double hydroxides
资金
- National High Technology Research and Development Program of China (863 Program) [2015AA03A402]
- Fuzhou University [0040-650021, 0041-600866]
Various Cu catalysts were prepared by the calcination and reduction of Cu-containing layered double hydroxides (LDHs) including Cu-Al LDHs, Cu-Mg-Al LDHs, Cu-Zn-Al LDHs, and Cu-Zn-Cr LDHs. The catalysts were characterized by using ICP, N-2 physisorption, TG, SEM, XRD, H-2-TPR, and N2O chemisorption, and tested for the water-gas shift (WGS) reaction at 453-623 K. The characterization results reveal the formation of LDHs on the as-synthesized precursors. Upon calcination and reduction, highly dispersed Cu nanopartides, particularly for Cu/MgO/Al2O3, were formed. The Cu surface area and Cu dispersion was found to be Cu/MgO/Al2O3 > Cu/Al2O3 > Cu/ZnO/Al2O3 > Cu/ZnO/Cr2O3. The activity of the LDHs-derived Cu catalysts for WGS decreased in the order of Cu/MgO/Al2O3 similar to Cu/ZnO/Al2O3 > Cu/ZnO/Cr2O3 > Cu/Al2O3. The high activity of Cu/MgO/Al2O3 was attributed to its high Cu-0 surface area and Cu dispersion, while the interaction between metallic Cu and ZnO on Cu/ZnO/Al2O3 might be responsible for the WGS activity. Interestingly, the highly dispersed Cu metal particles on the Cu/MgO/Al2O3 catalyst seemed stable during the WGS reaction. (C) Copyright 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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