(394d) CO Adsorption Isotherms On Low Content Pt Supported On Mesoporous TiO2

Production of hydrogen from renewable resources (e.g., biomass) is considered an effective approach to mitigating the environmental problems caused by pollutant emissions from fossil fuels. There is a great deal of interest in Pt/TiO2 because of its promising catalytic prospects in applications of hydrogen production from biomass. However, one important problem should be overcome is that CO as a by-product that will significantly impair the catalytic performance even the presence of carbon monoxide (CO) is as low as only 5-10 ppm. In the present paper, we aimed to fabricate Pt/TiO2 catalyst by doping Pt onto mesoporous TiO2 and investigate its ?CO poisoning' resistance by measuring the CO adsorption isotherms.

Nano size and fibrous mesoporous TiO2 and 0.5, 1.0, and 2.0% Pt doped nano size mesoporous TiO2 were synthesized. Nano size mesoporous TiO2 is found to be a more suitable support for Pt/TiO2 catalysts than fibrous TiO2. Adsorption isotherms of pure gas CO on the synthesized mesoporous TiO2 and Pt/TiO2 were measured at temperatures ranging from 308Kto 423K and pressures up to 700 mmHg. It was found that the low content 0.5% Pt/TiO2 catalyst shows better CO adsorption resistance. All measured adsorption isotherms of CO were correlated to fit adsorption models Sips, Toth, and UNILAN. In addition, catalytic performance was tested on hydrogen production from methanol and glucose aqueous solutions with these catalysts. Our results showed that the 0.5% Pt/TiO2 catalyst has potentially good CO poisoning resistivity within a wide temperature range and better performance on hydrogen production.