Effect of aging on propane catalytic oxidation over Co-Ce catalyst
ZHANG Shuo1, WU Wei-hong2, YANG Yang1, LIU Shao-jun1, SONG Hao1, ZHENG Cheng-hang1, GAO Xiang1
1. National Environmental Protection Engineering Technology Center for Air Pollution Control by Coal Burning, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China; 2. Energy Engineering Design and Research Institute of Zhejiang University Co., Ltd, Hangzhou 310027, China
Abstract：A series of Co-CeOx catalyst were prepared via citric acid complex method and accelerated aging at different temperatures. The fresh and aged catalysts were tested for propane catalytic oxidation, and its structure and properties were characterized. The results showed that when the accelerated aging temperature was lower than 650℃, the temperature range of propane conversion up to 50% was less than 10℃; when the accelerated aging temperature was higher than 750℃, the catalytic activity of the catalyst decreases rapidly. Characterization results showed that the main structure of Co-CeOx catalyst is spinel. After aging, the grain size increased significantly, the concentration of Co3+ species decreased, and the temperature of hydrogen reduction peaks were right shifted. The effect of accelerated aging treatment on the physical structure of Co-CeOx catalyst further inhibited its chemical properties and catalytic activity. At the same time, the catalytic oxidation activity for acetone and toluene was also tested. The removal efficiency of the catalyst was 90% at 179 and 244℃, respectively. Therefore, Co-CeOx multi active sites catalyst has good oxidation performance and stability.A series of Co-CeOx catalyst were prepared via citric acid complex method and accelerated aging at different temperatures. The fresh and aged catalysts were tested for propane catalytic oxidation, and its structure and properties were characterized. The results showed that when the accelerated aging temperature was lower than 650℃, the temperature range of propane conversion up to 50% was less than 10℃; when the accelerated aging temperature was higher than 750℃, the catalytic activity of the catalyst decreases rapidly. Characterization results showed that the main structure of Co-CeOx catalyst is spinel. After aging, the grain size increased significantly, the concentration of Co3+ species decreased, and the temperature of hydrogen reduction peaks were right shifted. The effect of accelerated aging treatment on the physical structure of Co-CeOx catalyst further inhibited its chemical properties and catalytic activity. At the same time, the catalytic oxidation activity for acetone and toluene was also tested. The removal efficiency of the catalyst was 90% at 179 and 244℃, respectively. Therefore, Co-CeOx multi active sites catalyst has good oxidation performance and stability.
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