Study of platinum catalyst preparation on gamma-alumina and titanium oxide for abatement of exhaust gases from internal combustion engines

Abstract

The objective of this thesis is to study effects of the catalyst preparation on activity of Pt/AL2O3and Pt/TiO2 for the abatement of exhaust gases from internal combustion engine. The experiments were performed within a 0.6 cm quartz tube reactor in the reaction temperature range of 50-500℃. The synthesis gas comprising 0.05%vol. NO, 0.3%vol. CO, 0.215%vol. C3H8 and 1.2%vol. O2 was introduced into the reactor at the GHSV of 15,000 h-1. The suitable temperature for the preparation of both platinum-based catalysis was observed at 550℃. The catalysts that were calcined in air gave the higher light-off temperatures of NO, CO and C3H8 when compared to those obtained from the calcination under reducing condition. Investigation of the catalytic performance showed no effect of the O2 concentration whether it is operated under lean-burn or stochiometric conditions. Besides, CO gave an insignificant influence on NO reduction, since the complete combustion was observed over the reaction conditions. Moreover, the process of O2 coverage over the catalyst surface was examined to be reversible.