老化对钴铈基催化剂催化氧化丙烷的影响

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Abstract A series of Co-CeO_x 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-CeO_x 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-CeO_x 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-CeO_x multi active sites catalyst has good oxidation performance and stability.A series of Co-CeO_x 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-CeO_x 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-CeO_x 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-CeO_x multi active sites catalyst has good oxidation performance and stability.

Key words： Co-Ce catalysts propane catalytic oxidation multi active sites thermal stability

Received: 22 June 2020

PACS:	TQ032.4
	X511

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	ZHANG Shuo
	WU Wei-hong
	YANG Yang
	LIU Shao-jun
	SONG Hao
	ZHENG Cheng-hang
	GAO Xiang

Cite this article:

ZHANG Shuo,WU Wei-hong,YANG Yang等. Effect of aging on propane catalytic oxidation over Co-Ce catalyst[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 614-621.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/614

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