Dehydroisomerization of n-pentane on SAPO-11 molecular sieves impregnated with platinum

摘要

The catalytic transformations of n-pentane were performed over a platinum-promoted silicoaluminophosphate molecular sieve (Pt/SAPO-11).The catalytic results indicate high yield for the production of pentenes with a good approach to the equilibrium distribution between the linear pentenes and iso-pentenes.The space velocity (WHSV) variation ranging between 1.6 and 4.7 h~(-1),and the catalyst regeneration did not affect the catalytic behavior of the Pt/SAPO-11.On the contrary,Pt reduction at a temperature below 500 deg C,the H_2-pentane molar ratio increase and Pt content below 0.5 wt.%,resulted in lower yield for the production of pentenes with an increase in the production of hydrocarbons with less than five carbon atoms (undesirable side reactions).