微波催化燃烧印刷包装VOCs废气的矿化途径与降解机理

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Abstract Combined with the catalytic advantages of both noble metal and transition metal catalysts, Pt-CuMnCeO_x/honeycomb nano ceramics monolithic catalyst was prepared by incipient-wetness impregnation method. The mineralization effect and catalytic mechanism of VOCs (toluene and acetone) waste gas from printing and packaging industry on the surface of Pt-CuMnCeO_x/honeycomb nano ceramics under microwave irradiation were investigated. The results showed that bed temperature reached 300℃, and the mineralization rate of two-component VOCs was 82% under conditions of microwave power 600W, airflow 5m³/h, and toluene and acetone concentrations 1000mg/m³ respectively. Based on XRD and XPS characterizations, highly dispersive Pt particles and copper, manganese, and cerium spinel active components enhanced the catalytic efficiency of toluene and acetone at low temperature in the role of microwave "hot spots". Microwave catalytic combustion reaction followed L-H mechanism and MvK mechanism simultaneously, and electron transfer occurred between different metals with different valence states resulting in more surface adsorbed oxygen and lattice oxygen formed on the catalyst surface, which promoted the adsorption and oxidation of VOCs molecules. According to intermediate products determination, it speculated that toluene was oxidized to benzaldehyde, benzoic acid, and small molecule acids gradually, and finally mineralized to carbon dioxide and water. The oxidative pathway of acetone was small molecule aldehydes and acids, and then carbon dioxide and water.

Key words： Pt CuMnCeO_x VOCs catalytic combustion microwave mechanism

Received: 26 April 2021

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X511

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	Articles by authors
	CHEN Jin
	BO Long-li
	ZHANG Dan-qing
	ZHANG Ji-bin
	TIAN Ye
	LIU Jia-dong

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CHEN Jin,BO Long-li,ZHANG Dan-qing等. Mineralization and mechanism of VOCs waste gas from printing and packaging industry by microwave catalytic combustion[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5104-5113.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5104

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