Citation: SHI Heng-Chao, WANG Wen-Chun, YANG De-Zheng, HUO Yan, JIA Li. Effect of OH Radicals on Formaldehyde Removal in Dielectric Barrier Discharge[J]. Acta Physico-Chimica Sinica, ;2011, 27(08): 1979-1984. doi: 10.3866/PKU.WHXB20110802 shu

Effect of OH Radicals on Formaldehyde Removal in Dielectric Barrier Discharge

1.
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, Liaoning Province, P. R. China

Received Date: 26 January 2011
Available Online: 8 June 2011
Fund Project: 国家自然科学基金(50977006, 10575019) (50977006, 10575019) 辽宁省教育厅重点实验室项目(2009S017) (2009S017)中央高校基本科研业务费专项资金 (DUT10JR03)资助项目 (DUT10JR03)

The removal of formaldehyde by dielectric barrier discharge in a coaxial cylindrical reactor has been studied at atmospheric pressure. The emission spectra of OH (A²Σ→X ²Π, 0-0) emitted from the dielectric barrier discharge have been successfully recorded. The relationship between the removal efficiency of formaldehyde and the emission intensity of OH (A²Σ→X ²Π, 0-0) has been investigated at different applied voltages, driving frequencies, concentrations of ar n and oxygen. We find that the removal efficiency of HCHO increases when the emission intensity of OH (A²Σ→X ²Π, 0-0) increases with rising applied voltage, driving frequency, and concentration of ar n. However, the removal efficiency of HCHO decreases when the emission intensity of OH (A²Σ→X ²Π, 0-0) decreases with an increase in the concentration of oxygen. The removal efficiency of HCHO is 93.8% in N₂+HCHO mixed gas at 11.5 kV applied voltage and 9 kHz driving frequency.
- Dielectric barrier discharge,
- Formaldehyde removal,
- OH radical,
- Emission spectrum,
- Atmospheric pressure
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