Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220278.doi: 10.7503/cjcu20220278

• Physical Chemistry • Previous Articles     Next Articles

Influence Mechanism of Filling Transition Metal Oxide Catalyst with Different Components on Nitrogen Fixation in Dielectric Barrier Discharge

LIU Kun1(), YIN Yuan1, GENG Wenqiang1, XIA Haotian1, LI Hua2   

  1. 1.College of Electrical Engineering,Chongqing University,Chongqing 400044,China
    2.College of Life and Environmental Sciences
    3.Guangxi Key Laboratory of Automatic Detection Technology and Instrument,Guilin University of Electronic Technology,Guilin 541004,China
  • Received:2022-04-24 Online:2022-11-10 Published:2022-07-21
  • Contact: LIU Kun E-mail:liukun@cqu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(51877021);the Guangxi Key Laboratory of Automatic Detecting Technology and Instruments, China(YQ21204)

Abstract:

In order to promote the synergistic catalytic nitrogen fixation effect of dielectric barrier discharge(DBD), the single, binary and ternary supported catalysts with different Mn/Co/W elements were prepared in this paper, and the catalysts were placed in the DBD air gap for plasma co-catalytic nitrogen fixation reaction. The catalysts were characterized by XRD, SEM and EDS. The concentration of total nitrogen in liquid phase was determined by ultraviolet spectrophotometry and the experimental results showed that the concentration of total nitrogen in the experimental group filled with catalyst was significantly increased compared with that in the untreated group. Fourier transform infrared spectroscopy(FTIR) was used to detect the gas-phase products of DBD with or without catalyst filling. It was proved that catalyst filling could promote the formation of NO2 and N2O5 in space. DBD gas-phase chain reactions and the principle of catalysis revealed that the total nitrogen concentration was increased because the catalyst provided a mass of oxygen vacancies in the plasma coordination process, making NO x fully oxidized. Multiple compound catalysts can further promote the nitrogen fixation effect through the transformation of metal element valence state and energy transfer on the basis of single type. The highest total nitrogen concentration of the ternary compound catalyst Mn3WCo/γ-Al2O3 experimental group was obtained at the voltage of 22 kV, which was 119.13 mg/L. Compared with the maximum value of unfilled catalyst group, it increased by 71.61%.

Key words: Dielectric barrier discharge(DBD), Low-temperature plasma nitrogen fixation, Plasma co-catalysis, Transition metal oxide catalyst

CLC Number: 

TrendMD: