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Citation: SUN Qi, REN Liang, NIU Jin-Hai, SONG Zhi-Min. Interactions of Dielectric Barrier Discharge Plasmas with NO or NO/O₂ Adsorbed on CuZSM-5[J]. Acta Physico-Chimica Sinica, ;2008, 24(07): 1214-1218. doi: 10.3866/PKU.WHXB20080716 shu

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

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 Date: 24 December 2007
Available Online: 26 May 2008

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.
- CuZSM-5; Temperature programmed desorption; Dielectric barrier discharge; NOx
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Interactions of Dielectric Barrier Discharge Plasmas with NO or NO/O2 Adsorbed on CuZSM-5

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