A Study on the H2 Oxidation over Pt/TiO2, SO2 Poisoning and Regeneration

In this article, Pt/TiO2 was manufactured in the form of powder and honeycomb, and the influence of SO2, which is a poisonous substance to catalyst, and regeneration method were investigated. The catalytic activity of Pt/TiO2 before and after the exposure to SO2 was also compared. The initial activity of Pt/TiO2 was proportional to the injected H-2 concentration (1 similar to 5%). And the optimum temperature of the catalyst and conversion rate of H-2 were 183. and 95%, respectively. It was confirmed that when exposing 2,800 ppm of SO2 to the powder and honeycomb Pt/TiO2, the performance of catalyst was not measurable and also 0.69% sulfur (S) remained on the catalyst surface. As a result of the cleaning and heat treatment for the poisoning catalyst, the activity of the powder catalyst exhibited a conversion rate of H-2 greater than 96%. Whereas, the honeycomb catalyst showed a conversion rate of H-2 greater than 95% when it was regenerated through the heat treatment of H-2 or air atmosphere.