Low Temperature Catalytic Combustion of Cooking Fume over Pt/γ-Al2O3/CexZr1-xO2 Catalyst

Pt/gamma-Al2O3/CexZr1-xO2(x=1, 0.75, 0.5, 0.25, 0) catalysts. were prepared using CexZr1-xO2 solid solution as support. The prepared catalysts were characterized by Brunauer-Emmet-Teller (BET) specific surface area analysis, X-ray diffraction (XRD), and H-2-temperature programmed reduction (H-2-TPR). Catalytic performances for the catalytic combustion of cooking fume were systematically investigated. Gas adsorption measurements showed that the BET surface areas of the as-prepared catalysts decreased as the Ce/Zr molar ratio decreased in the CexZr1-xO2 solid solution. XRD results indicated that deposited Pt was well dispersed on the CexZr1-xO2 and gamma-Al2O3 matrix. H-2-TPR results revealed that the reduction peak area of Pt/gamma-Al2O3/Ce0.5Zr0.5O2 was the largest and that the oxygen mobility in this catalyst was noticeably promoted. It was found that the loaded Pt on the CeZr1-xO2 solid solution lowered the reaction temperature, which was favorable for the catalytic combustion of cooking fume. The catalytic activity for the catalytic combustion of cooking fume changed with the variation of the Ce/Zr molar ratio in the CexZr1-xO2 solid solution. The order of catalytic activity for catalytic combustion of cooking fume was: Pt/gamma-Al2O3/Ce(0.5)rZr(0.5)O(2)>Pt/gamma-Al2O3/Ce0.25Zr0.75O2>Pt/gamma-Al2O3 /Ce0.75Zr0.25O2>Pt/gamma-Al2O3/CeO2>Pt/gamma-Al2O3/ZrO2.