Silicon Poisoning of Pt/Al_2O_3 Catalysts in Naphtha Reforming

摘要

The silicon poisoning of a Pt/Al_2O_3 catalyst was studied as a model system for industrail catalysts. Samples were contaminated using methyl-and phenyl-substituted polyoxysilane (MPSP) during the reforming of cyclohexane. It was found that silicon changes the chemisorption properties of platinum and does not affect its sinterization. However, coke has a more improtant effect in reducing the activity of the metallic function. On the other hand, silicon is harmful to the acid function even in small amounts, suggesting that the poisoning is selective.