Pt Catalyst over SiO2 and Al2O3 Supports Synthesized by Aerosol Method for HC-SCR DeNOx Application

摘要

Silica-supported platinum (Pt/SiO2) and alumina-supported platinum (Pt/Al2O3) catalysts have been prepared by an aerosol spray pyrolysis method. Systematic characterization of each catalyst using TEM, XRD, and XPS revealed that crystalline and metallic Pt nanoparticles were well dispersed on the surface of silica and alumina supports. The sintering effect on Pt particles over Al2O3 at high temperature (~250°C) is more prominent than those over SiO2; this suggests that there is stronger interaction between Pt particles and SiO2 support, when compared to Pt over Al2O3 support, resulting in Pt particles size below 3 nm. Moreover, steady-state catalytic experiments for selective reduction of nitrogen monoxide by propene have demonstrated that NOx conversions to N2O and N2 in Pt/SiO2 and Pt/Al2O3 catalysts are 29.8% and 55.8% at 250°C, respectively.