Thermal Treatment Effect on Catalytic Activity of Au/TiO2 for CO Oxidation

Asif Mahmood; Shahid M. Ramay; Yousef Al-Zeghayer; Sajjad Haider; Muhammad Ali Shar; Yasir Khalid

doi:10.4028/www.scientific.net/AMM.548-549.254

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Thermal Treatment Effect on Catalytic Activity of Au/TiO₂ for CO Oxidation

Abstract:

A novel and well-organized study for the synthesis and enhanced catalytic activity of Au/TiO₂ catalysts has been developed. A momentous improvement in the catalytic activity of Au/TiO₂ in CO oxidation and preferential oxidation reaction by thermal treatment has been studied. Au/TiO₂catalyst (Au (1 wt.%) supported on TiO₂) was prepared by conventional deposition-precipitation method with NaOH followed by washing, drying and calcination in air at 400 °C for 4 h. Thermal treatment of Au/TiO₂ was performed at 450 °C under 0.05 mTorr. The activity of the catalysts has been examined in the reaction of CO oxidation and preferential oxidation (PROX) at 25-250 °C. The catalytic performance was found to be strongly affected by thermal treatment of the prepared catalyst prior to the reaction. Heat treatment after Au deposition has a positive effect on the CO oxidation performance. This is attributed to the introduction of a stronger interaction between the oxide and Au which improves the catalytic activity.