Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (07): 1214-1218.doi: 10.3866/PKU.WHXB20080716

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Interactions of Dielectric Barrier Discharge Plasmas with NO or NO/O2 Adsorbed on CuZSM-5

SUN Qi; REN Liang; NIU Jin-Hai; SONG Zhi-Min   

  1. Laboratory of Plasma Physical Chemistry, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China; College of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning Province, P. R. China
  • Received:2007-12-24 Revised:2008-04-21 Published:2008-07-04
  • Contact: SUN Qi E-mail:sunqils@dl.cn

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Abstract: In order to understand the synergistic effects between dielectric barrier discharge (DBD) plasmas and catalysts, the interactions between DBD and NO or NO/O2 saturated CuZSM-5 have been studied by adsorption and temperature programmed desorption (TPD) techniques. The results demonstrated that NO adsorbed on the CuZSM-5 surface and NOx species adsorbed on Cu active sites could be partly desorbed by DBD plasmas. Nitrogen oxides could be formed by plasma-induced surface reactions. A small amount of N2O and O2 could be formed in the NO/N2 system, and a significant amount of NOx (N2O, NO2, and NO) was generated in the NO/O2/N2 system by interactions between DBD plasmas and NO or NO/O2 adsorbed CuZSM-5. NOx removal over CuZSM-5 was tested by means of CuZSM-5 with or without plasma-pretreatment. After CuZSM-5, which had showed lower activity, was pretreated by N2 flow or DBD plasmas, NOx conversions in NO/N2 were 30.3% and 46.7%, respectively. The corresponding NOx conversion over fresh CuZSM-5 catalyst was 39.2%in NO/N2. A comparison of TPD profiles of NO and O2 over CuZSM-5 with or without plasma-pretreatment reveled that the key of the enhancement of NOx conversion on CuZSM-5 was the removal of NOx species present at Cu site by plasma-pretreating CuZSM-5.

Key words: CuZSM-5, Temperature programmed desorption, Dielectric barrier discharge, NOx