Abstract
The effect of high-temperature treatment in hydrogen on the carburization of palladium in a commercial 10% Pd/Al 2O 3 catalyst was studied by X-ray powder diffraction. It was found that reduction at 970 and 1070 K for 40 h causes contraction of the Pd lattice by 0.22 and 0.38%, respectively, presumably owing to Pd 1− x Al x alloy formation ( x=0.06 at 970 K and 0.10 at 1070 K). As a consequence of the alloying, alumina-supported Pd loses its ability to constitute a supersaturated Pd C solid solution on carburization in acetylene at 550 K. The initial activity of Pd can, however, be restored by a two-step process consisting in oxidation at 770 K followed by reduction in hydrogen at 720 K.
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