Abstract
The present work focuses on the development of bimetallic Au–Cu catalyst supported on CeO 2 for the oxygen-assisted water-gas-shift (OWGS) reaction. Au–CuO/CeO 2 catalyst with Au loadings of 0.5, 1 and 1.5 wt.% and Cu loadings of 7, 11 and 20 wt.% were prepared by incipient wetness impregnation. The as-prepared catalysts were characterized by means of XRD, BET, and a set of temperature programmed methods. The catalysts activity was evaluated in CO-PROX, WGS and OWGS reactions. For WGS reaction the gold addition did not improve the activity of the better 7% CuO/CeO 2 catalyst. Addition of 1% of gold to CuO/CeO 2 improved the catalyst activity in CO-PROX and widened the operation window. Either with λ = 1 and 2, complete CO conversion is achieved at low temperature, usually below 120 °C, with high selectivities with all gold-containing catalysts. When small oxygen amount is added to the WGS mixture, the activities of all the catalysts tested were improved in terms of CO conversion, particularly catalysts containing both Au and CuO, although parallel hydrogen oxidation also is slightly improved. Catalyst with 1% Au and 7% CuO supported on ceria achieves almost equilibrium CO conversion at 220 °C when O 2/CO = 0.5 is added to the feedstream.
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