Characteristics and mechanism of high voltage discharge plasma enhanced multiple metal catalyst for degrading para-xylene
LI Jun-chao1, TANG Xiu-jun1, LI Jun-hang1, CAI Wei-jian2, LI Ji-wu1
1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China; 2. School of Food and Biotechnology Engineering, Zhejiang Gongshang University, Hangzhou 310018, China
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 Oads and Olat of the catalyst, with Oads accounting for 54.67%, and improve the Oads 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 NOx. 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.
李俊潮, 唐秀娟, 李俊航, 蔡伟建, 李济吾. 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[J]. 中国环境科学, 2023, 43(S1): 10-19.
LI Jun-chao, TANG Xiu-jun, LI Jun-hang, CAI Wei-jian, LI Ji-wu. Characteristics and mechanism of high voltage discharge plasma enhanced multiple metal catalyst for degrading para-xylene. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 10-19.
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