Pt/γ-Al2O3/CexZr1-xO2催化剂低温催化燃烧去除饮食油烟

以CexZr1-xO2固溶体做载体, 制备了系列Pt/γ-Al2O3/CexZr1-xO2催化剂(x=1, 0.75, 0.5, 0.25, 0). 应用Brunauer-Emmet-Teller (BET)比表面积分析、X射线衍射(XRD)和H2程序升温还原(H2-TPR)等手段对催化剂进行相关表征, 并系统研究了催化剂在饮食油烟催化燃烧中的催化活性. BET结果表明催化剂的比表面积随Ce/Zr摩尔比的减小而减小. XRD结果表明贵金属Pt很好地分散在氧化铝和CexZr1-xO2固溶体上. H2-TPR结果发现催化剂Pt/γ-Al2O3/Ce0.5Zr0.5O2的还原峰面积最大且氧离子的流动性最好. 催化活性研究结果表明Pt负载在CexZr1-xO2固溶体上有利于油烟的催化燃烧, 降低了反应温度. 随着CexZr1-xO2固溶体中Ce/Zr摩尔比的变化, 催化剂的活性顺序为Pt/γ-Al2O3/Ce0.5Zr0.5O2>Pt/γ-Al2O3/Ce0.25Zr0.75O2>Pt/γ-Al2O3/Ce0.75Zr0.25O2>Pt/γ-Al2O3/CeO2>Pt/γ-Al2O3/ZrO2.

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

Pt/γ-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 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 CexZr1-xO2 solid solution. XRD results indicated that deposited Pt was well dispersed on the CexZr1-xO2 and γ-Al2O3 matrix. H2-TPR results revealed that the reduction peak area of Pt/γ-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 CexZr1-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/γ-Al2O3/Ce0.5Zr0.5O2>Pt/γ-Al2O3/Ce0.25Zr0.75O2>Pt/γ-Al2O3/Ce0.75Zr0.25O2>Pt/γ-Al2O3/CeO2>Pt/γ-Al2O3/ZrO2.