整体式钴基复合金属催化剂微波催化燃烧甲苯特性

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Abstract A series of monolithic cobalt-based composite metal catalysts were prepared through impregnation method by combining cobalt (Co) with transitional metals copper (Cu), Manganese (Mn) and Cerium (Ce) as active components and using honeycomb cordierite as carrier. The catalytic activity of the catalysts was investigated using toluene as a kind of typical VOCs under microwave irradiation. The results showed that the catalytic activity of Co-based catalysts for toluene removal was in the order of CoCuCeO_x> CoCuO_x> CoCuMnCeO_x> CoCuMnO_x when the inlet toluene concentration was 1000mg/m³with flow rate of 4L/min. The T₅₀and T₉₀of toluene achieved by CoCuCeO_x catalyst was 220℃ and 295℃, respectively. According to the characterizations analysis, CoO_x, CuO_x, and CuCo₂O₄spinel particles on the surface of the catalyst were formed into spherical structures with voids by the recombination of cobalt and copper oxides. However, the addition of manganese was not conducive to the formation of this spherical structure. The CuCo₂O₄ spinel was formed by the replacement of partial Co²⁺ in the structure of Co₃O₄ with Cu²⁺. The easily breakage of Co-O and Cu-O bonds in CuCo₂O₄ spinel promoted the adsorption and activation of gaseous oxygen, which was beneficial to the generation of surface reactive oxygen species that participated in the oxidation of toluene. The addition of Ce led to the conversion of Ce³⁺/Ce⁴⁺, which promoted the formation of abundant oxygen vacancies on the surface of CoCuCeO_x catalyst and then acted as the active centers to promote the oxidative degradation of toluene. The coupling of cobalt, copper, and cerium changed the structure of the active components, which effectively improved the absorption performance and catalytic activity of the catalyst. It provided extensive application prospects in the technology of microwave catalytic combustion of VOCs.

Key words： cobalt-based composite metal cobalt copper spinel monolithic catalyst microwave catalytic combustion toluene

Received: 02 July 2023

PACS:

X511

Corresponding Authors: 卜龙利,副教授,bolongli@xauat.edu.cn E-mail: bolongli@xauat.edu.cn

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	ZHAO Si-rui
	BO Long-li
	DAI Jing-wen
	HUANG Si-ning
	LUO Meng-yao
	LIU Nan
	WANG Jia-le

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ZHAO Si-rui,BO Long-li,DAI Jing-wen等. Microwave catalytic combustion of toluene by monolithic cobalt-based composite metal catalysts[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1253-1264.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I3/1253

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