Abstract
Modulating the active sites in atomic level is very meaningful to optimize catalyst performance but still very challenge. Herein, Pt catalysts loaded on different supports (ZSM-5, Al2O3, ZrO2, CeO2) were sulfate modified by in situ pyrolysis of (NH4)2SO4 mixed with Pt catalyst. Sulfate remarkably improves these catalyst activities for propane combustion, particularly for the sulfate modified Pt/ZSM-5 catalyst with the highest activity among them. Through controlling the amount of (NH4)2SO4 used and the loading of Pt, Pt/S atomic ratio in the sulfate modified Pt/ZSM-5 catalyst was successfully regulated. Pt/S atomic ratio significantly affects the electron transfer from Pt species to sulfate and also their interaction strength, which is decisive to the synergetic catalysis of sulfate and Pt species. The 5S-2Pt/ZSM-5 with Pt/S atomic ratio of 0.5 shows a moderate strength of sulfate and Pt species interaction, which is responsible for its highest reaction rate of 86.5 μmol·gPt−1·s−1 at 200 °C.
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