过渡金属改性的Cr-Ce-O催化剂氧化氯苯性能

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Abstract Chlorobenzene was applied as a probe for chlorinated volatile organic compounds, and rare-earth based CeO₂ was used as the active oxide. The Cr-Ce-O catalysts were prepared by complexation method with citric acid adding. The effects of the molar ratio of Cr/Ce, the doping and amount of transition metal oxide, the supports, and calcination temperature on chlorobenzene oxidation were investigated. The as-prepared catalysts were characterized by XRD, BET, SEM, H₂-TPR and XPS. CrCeO_xsolid solution was formed between Cr₂O₃ and CeO₂, and the specific surface area of Cr₂O₃-CeO₂/Al₂O₃ catalyst with ZrO₂ doping was improved, significantly. The supports exhibited an important influence on the morphology and structure of the active components. The oxidation activity of these catalysts with calcination temperature at 400℃ and cordierite support was higher. The results also exhibited that the ZrO₂ doping also displayed a significant effect on the oxidation activity. When the molar ratio of Zr/Cr was 1:2, the Cr₂O₃-CeO₂-ZrO₂/cordierite catalyst showed the highest performance, and the conversion rate of chlorobenzene oxidation was 92.7% (the reaction temperature was 350℃). It was mainly attributed to ZrO₂ doping promoted the interaction between CeO₂ and Ce₂O₃, Cr₂O₃ and ZrO₂, and enhanced oxygen vacancy attributed to the increase of surface-active oxygen (O_sur).

Key words： catalyzed oxidation CVOCs catalysts Cr-Ce-O oxides doping

Received: 06 November 2020

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X511

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	Articles by authors
	XU Gong-da
	SI Han
	HUANG Qiong
	TAO Tao
	YANG Bo
	ZHAO Yun-xia
	CHEN Min-dong

Cite this article:

XU Gong-da,SI Han,HUANG Qiong等. Catalytic oxidation of chlorobenzene over Cr-Ce-O catalysts modified by transition metals[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(7): 3184-3192.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I7/3184

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