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The effect of surface Mo on the water–gas-shift (WGS) activity of Pd/ceria was studied. A series of 1 wt% Pd catalysts, with varying Mo content, were prepared from supports obtained by aqueous impregnation of (NH 4 ) 2 MoO 4 onto ceria. Rates were found to decrease linearly with Mo coverage up to 1.8 Mo/nm 2 and were 10% of that on Pd/ceria after the addition of this...
The species formed by exposure of a Pd/ceria catalyst to SO 2 under various conditions have been studied using temperature-programmed desorption (TPD) and FTIR. For adsorption of SO 2 between 298 and 473 K, a molecular SO 2 species adsorbs on the surface, possibly as a surface sulfite, and this species converts to a sulfate above 473 K. Exposure of Pd/ceria to SO 2 ...
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