Bifunctional Zeolite- and Aluminophosphate-Based Catalysts for Hydrocracking and Hydroisodeparaffinization. Part 2. The Influence of the Nature and Activity of the Hydrogenating and Acid Components on the Activity and Selectivity of Hydroisodeparaffinizat

Two series of bifunctional hydroisodeparaffinization catalysts containing palladium supported on SAPO-11 and SAPO-31 were prepared and characterized. These were catalysts: 1) With different activities of the acidic component at the constant activity of the hydro-dehydrogenating component; 2) With different activities of the hydro-dehydrogenating components at the constant activity of the acidic component. With the catalysts with identical hydro-dehydrogenating activities, the temperature of eaching 90 % conversion of n-decane was shown to depend linearly on a total of the activity of the acidic component of the catalyst. Similar profiles of the dependencies were characteristic of both SAPO-11 and SAPO-31. The bifunctional catalysts based on SAPO-31 were much more active than the catalysts on SAPO-11. At identical total activities of the acidic components, the temperature of reaching 90 % conversion of n-decane was 50 °C lower over Pd/SAPO-31 than over Pd/SAPO-11. Ways to controlling the total activity and selectivity of the hydroisodeparaffinization catalyst by varying the activity of the acidic and/or hydro-dehydrogenating components of the bifunctional catalyst were demonstrated. An increase in the hydro-dehydrogenating activity led to an increase in the hydroisomerization activity of the bifunctional catalyst but practically not to changes in the selectivity to isomers. An increase in the toital activity of the acidic component also led to an increase in the hydroisomerization activity of the bifunctional catalyst, while the selectivity to isomers changed considerably.

silicoaluminophasphates SAPO-11 and SAPO-31, palladium, acidic support, hydroisodeparaffinization catalyst, acidic and hydro-dehydrogenating components, bifunctional catalyst

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