Hydrodechlorination, dechlorohydrogenation, and isomerization of CFC 113 took place over Ni, Pd, Pt, Au catalysts supported on fluorides at 200—550 °C in the presence of hydrogen. Over Ni/CeF3j Ni/LaF3, and Ni/CaF2 catalysts, C2C1F3(I) and CH4 were formed selectively at <350°C and at >450 °C, respectively. Compound (I) was a major product at 250—550 °C over Ni/PbF2 and Ni/MnF2 catalysts. CFC 113 was converted at > 150-200 °C over Pd/CeF3 and Pd/LaF3 and the conversion increased with increasing temperature. The conversion gave a maximum of 85% at 300 °C and a minimum of 10∼15% at 450∼500 °C and then increased again with increasing temperature. CF3CC1H2(II) and CF3CCl2H(III) were formed at <350 °C and the selectivity of (F) increased to 90% at 550 °C from 50% at 150 °C over Pd/CeF3. Compounds (II) + (F), C2F3H, and (I) were formed successively with increasing temperature over Pd/LaF3. Pd/MnF2 was less active for the reaction. Compounds (II) + (III) and CFHCFH(V) were major products at <250°C and at 300—500 °C, respectively, over Pt/CeF3. (IE) and (V) were produced slectively at <250 °C and 250-500 °C over Pt/LaF3} respectively. Activity of Pt/MnF2 was relatively low, and the high selectivity, 80—100%, was maintained at all reaction temperatures. Compound(I) was a major product at >350°C over Au/MnF2 and Au/CeF3. No changes in acitivity and selectivity were observed after 55 h at 300 °C over Ni/CaF2. β-PbF2 changed into PbCl2 during the reaction, however, the other fluorides reacted with neither CFC 113 nor supported metals. Specific surface areas of Pd/CeF3 and Au/CeF3 increased after the reaction. Dispersion of Pd increased during the reaction over fluoride supports.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)