Propane dehydrogenation over PtZn localized at Ti sites on TS-1 zeolite

Abstract

A PtZn/0.02TS-170 catalyst with very high activity, selectivity, and catalytic durability for propane dehydrogenation is reported in this paper. It was found that the excellent properties of the catalyst originate from the strong interaction of the Ti existing in the zeolite framework with Zn and Pt. The Ti not only remarkably increases the Pt dispersion and thereby enhances the initial activity of the catalyst, but also significantly modifies the electronic density of Pt together with the Zn and therefore increases the durability of the catalyst. The crucial functions of the Ti in constructing the structure and for modifying the reaction were evidenced by the CO adsorption capacity, CO adsorption IR spectroscopy and C₃H₆-TPD of the related catalysts. Thanks to the interaction of the Ti with Zn and Pt, the PtZn/0.02TS-170 catalyst exhibited a very high initial specific rate of 58.09 mol_C3H6 g_Pt⁻¹ h⁻¹ and a quite low deactivation constant of 0.0158 h⁻¹ in the 96.8 h time on stream at 600 °C.