放电等离子体增强多元金属催化剂降解对二甲苯的特性与机理

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Abstract The Mn-Co-La-Ce/Al₂O₃, Mn-Co-Ce/Al₂O₃ and Mn-La-Ce/Al₂O₃ multiple metal catalysts were prepared by impregnation, respectively. The characterization of the Mn-Co-La-Ce/Al₂O₃ in before and after the reaction were performed using BET, XPS, O₂-TPD, and FT-IR. The catalytic degradation efficiency of p-xylene in the discharge non-thermal plasma (NTP) synergistic catalytic system were studied. The effects of catalytic reaction conditions (initial concentration, oxygen content, and gas-flow rate) on degradation efficiency were investigated. The organic by-products of degradation for NTP cooperative catalyst were analyzed by using GC-MS, and the degradation mechanism of NTP synergistic catalytic system was discussed. The results show that the plasma will increase the strength of the lattice oxygen release on the surface of the catalyst. La doping in multiple catalysts can improve the binding energy of O_ads and O_lat of the catalyst, with O_ads accounting for 54.67%, and improve the O_ads content of the catalyst by up to 1.24%. Compared with the NTP alone, the degradation efficiency of the NTP synergistic multiple catalyst was increased by more than 50%, and the CO₂ selectivity was also increased by about 30%. In the NTP synergistic Mn-Co-La-Ce catalytic reaction, the effect of initial concentration, gas volume and oxygen content on degradation efficiency was negatively correlated, and the effect of voltage on degradation efficiency was positively correlated, which can effectively inhibit the production amount of by-products such as O₃ and NO_x. It is speculated that there are three main pathways for the degradation mechanism of NTP synergistic catalysts. The results can provide some theoretical support for the NTP synergistic catalyst for degradation of p-xylene.

Key words： metal oxide catalyst p-xylene non-thermal plasma synergistic catalysis

Received: 01 February 2023

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X511

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	LI Jun-chao
	TANG Xiu-jun
	LI Jun-hang
	CAI Wei-jian
	LI Ji-wu

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LI Jun-chao,TANG Xiu-jun,LI Jun-hang等. Characteristics and mechanism of high voltage discharge plasma enhanced multiple metal catalyst for degrading para-xylene[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 10-19.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/IS1/10

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