%0 Journal Article
%T Pre-Reduction of Au/Iron Oxide Catalyst for Low-Temperature Water-Gas Shift Reaction Below 150 ˇăC
%A Shinji Kudo
%A Taisuke Maki
%A Takashi Fukuda
%A Kazuhiro Mae
%J Catalysts
%D 2011
%I MDPI AG
%R 10.3390/catal1010175
%X Low-temperature water-gas shift reaction (WGS) using gold catalyst is expected to be an attractive technique to realize an efficient on-site hydrogen production process. In this paper, Au/Fe 3O 4 catalysts for promoting the WGS below 150 ˇăC were developed by a preliminary reduction of Au/iron oxide (Fe 3+) catalyst utilizing high reactivity of Au nano-particles. The reduction was conducted under a CO, H 2, or CO/H 2O stream at either 140 or 200 ˇăC, and the effect of reduction conditions on the characteristics of the Au/Fe 3O 4 catalyst and on the catalytic activity in WGS at 80 ˇăC was investigated. The reaction progress during the pre-reduction treatment was qualitatively analyzed, and it was found that the iron oxide in Au/Fe 2O 3 calcined at 200 ˇăC was easily reduced to Fe 3O 4 phase in all reduction conditions. The reduction conditions affected the characteristics of both Au and iron oxide, but all of the reduced catalysts had small Fe 3O 4 particles of less than 20 nm with Au particles on the surface. The surface area and content of cationic Au were high in the order of CO, H 2, CO/H 2O, and 140, 200 ˇăC. In the WGS test at 80 ˇăC using the developed catalysts, the activities of the catalysts pre-reduced by CO at 140 or 200 ˇăC and by H 2 at 140 ˇăC were very high with 100% CO conversion even at such a low temperature. These results indicated that factors such as higher surface area, crystallized Fe 3O 4, and cationic Au content contributed to the catalytic activity.
%K water-gas shift
%K gold catalyst
%K iron oxide
%K pretreatment
%K reduction
%K activation
%U http://www.mdpi.com/2073-4344/1/1/175