Hydroisomerization of n-hexadecane over Pt/Al-MCM-41 catalysts: Two different Al incorporation methods

摘要

The hydroisomerization of n-hexadecane was carried out over Pt/Al-MCM-41 catalysts at350℃ and 103 bar. Al-MCM-41 was prepared by two different methods; a direct sol-gelmethod (Pre) and a post-grafting method (Post). Al-MCM-41 was characterized by usingXRD, nitrogen adsorption, ~(27)Al NMR and ammonia TPD. Pt/Al-MCM-41-Post showedhigher conversions and higher isomerization yield than Pt/Al-MCM-41-Pre. This differencewas attributed to the better accessibility of tetrahedral sites (Broensted acid sites) in Al- MCM-41-Post than those in Al-MCM-41-Pre.