Abstract
Silica-supported Pd and Pt catalysts were prepared by an ion-exchange method using ammoniacal solutions of [Pd (NH3) 4] Cl2 and [Pt (NH3) 4] Cl2. The catalyst precursors were calcined in air at prescribed temperature and reduced in a hydrogen stream at 450°C. The catalysts showed higher metal dispersion than those prepared by a conventional impregnation method. The Pt dispersion decreased with increasing the calcination temperature from 110 to 600°C, whereas the Pd dispersion did not change by the calcination at the temperatures lower than 450°C. Highly dispersed Pd and Pt catalysts exhibited higher selectivity to ethane in the hydrodechlorination of 1, 1, 1-trichloroethane. Over Pd catalysts, hydrodechlorinative coupling reaction took place to form n-C4H10 at ca 10% selectivity. The turnover frequency of the hydrodechlorination did not depend on the metal dispersion.
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