Abstract
The activities of CuO–CeO 2–ZrO 2 catalysts synthesized by four methods, e.g. sol–gel, co-precipitation, one-step impregnation, and two-step impregnation, were compared for CO removal from hydrogen-rich gas. The influence of the precipitant and calcination temperature on the catalytic activity was investigated, and a series of analytical methods, such as XRD, H 2-TPR, TG-DSC, and SEM, were used to characterize the catalysts. It was indicated that CuO–CeO 2–ZrO 2 catalyst prepared by co-precipitation method exhibits the widest operation temperature range with the 99% conversion of CO and relatively high selectivity. The optimized preparation conditions were confirmed using Na 2CO 3 as a precipitant, and calcining at 500 °C. It was proposed that the high activity and selectivity result from the high dispersion of copper and strong interaction among CuO, CeO 2, and ZrO 2. The effects of precipitants on the grain size and morphology of the catalyst is larger than that of calcination temperature.
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