Low temperature catalytic combustion of cooking fume over Pt/γ-Al₂O₃/Ce_xZr_1-xO ₂ catalyst

Pt/γ-Al₂O₃/Ce_xZr_1-xO ₂ (x=l, 0.75, 0.5, 0.25, 0) catalysts were prepared using Ce _xZr_1-xO₂ solid solution as support. The prepared catalysts were characterized by Brunauer-Emmet-Teller (BET) specific surface area analysis, X-ray diffraction (XRD), and H₂-temperature programmed reduction (H₂-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 Ce _xZr_1-xO₂ solid solution. XRD results indicated that deposited Pt was well dispersed on the Ce_xZr_1-xO ₂and γAl₂O₃ matrix. H₂-TPR results revealed that the reduction peak area of Pt/γ-Al₂O ₃/Ce_0.5Zr_0.5O₂ was the largest and that the oxygen mobility in this catalyst was noticeably promoted. It was found that the loaded Pt on the Ce_xZr_1-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 Ce_xZr_1-xO₂ solid solution. The order of catalytic activity for catalytic combustion of cooking fume was: Pt/γ-Al₂O₃Ce_0.5Zr_0.5O ₂>Pt/γ-Al₂O₃/Ce_0.25Zr _0.75O₂>Pt/γ-Al₂O₃/Ce _0.75Zr_0.25>Pt/γ-Al₂O ₃/CeO₂>Pt/γ-Al₂O₃/ZrO ₂.