Abstract
SiO 2- and CeO 2-promoted Ni catalysts, as an alternative to traditional water gas shift (WGS) catalysts, were studied through various characterization methods. CO removal was enhanced by CeO 2 promotion on Ni, but CeO 2 affected methanation rather than the WGS reaction. Mobile surface oxygen, a typical property of CeO 2, affected the Ni surface properties and weakened the bond strength between C and O atoms of carbon monoxide. On the contrary, in the case of SiO 2-promoted Ni catalyst, the SiO 2 supplied a hydroxyl group (–OH) to the Ni catalyst resulting in greater selectivity toward the WGS reaction than to methanation. Selectivity to the WGS reaction on the CeO 2-promoted Ni catalyst was lower than that on Ni bulk catalyst, while the SiO 2-promoted Ni catalyst showed higher selectivity to WGS than both the Ni bulk and CeO 2-promoted Ni catalysts.
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