Dehydrogenation of isobutane over Sn/Pt/Na-ZSM-5 catalysts: The effect of SiO_2/Al_2O_3 ratio, amount and distribution of Pt nanoparticles on the catalytic behavior

摘要

Sn/Pt/Na-ZSM-5 was used as catalyst for the dehydrogenation of isobutane, and the effect of SiO_2/Al_2O_3 ratio and the dispersion of Pt nanoparticles on the conversion and product selectivity were studied under atmospheric pressure at 848 K. The catalysts were characterized by various techniques such as H_2 chemisorption, TEM, SEM, EDX, XRD, FT-IR, TG/DTG elemental analysis by XRF and ICP techniques. Higher dispersion of Pt nanoparticles in the catalyst with SiO_2/Al_2O_3 ratio of 40 resulted in higher selectivity for isobutene.