ABSTRACT
Pt/H-ZSM-5 and Pt/H-MOR catalysts with different Pt contents were prepared via impregnation using H2PtCl6.6H2O or via exchange using Pt (NH3)4Cl2, calcination in air at 530oC and reduction in H2 at 500oC. The prepared catalysts were tested for n-pentane hydroisomerization and hydrocracking via bifunctionality at 250-500oC using micro-catalytic pulse reactor. It is found that the dispersion of Pt exchanged zeolites is higher than the corresponding Pt impregnated zeolites at all Pt contents. It is also found that the dispersion of Pt/H-ZSM-5 catalysts either exchanged or impregnated are higher than the corresponding Pt/H-MOR catalysts. TPD data showed that the impregnated catalysts possess higher acid sites number than the exchanged catalysts, while the Pt/H-ZSM-5 catalysts have higher number of acid sites than the Pt/H-MOR catalysts, whereas the latter catalysts possess higher strength of acid sites at all Pt contents. The hydroisomerization activities using Pt exchanged catalysts either supported on H-ZSM-5 or H-MOR are higher than the impregnated catalysts at almost all Pt contents. It is also concluded that the H-ZSM-5 supported catalysts either exchanged or impregnated are active than the H-MOR supported ones. Hydrocracking is higher using all H-MOR loaded catalysts.