Spectroscopic diagnostics of plasma-assisted catalytic systems for NO removal from NO/N2/O2/C2H4 mixtures

• Published in: Catalysis today Vol. 211; pp. 58 - 65
• Main Authors: Niu, Jinhai, Peng, Bo, Yang, Qi, Cong, Yan, Liu, Dongping, Fan, Hongyu
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2013; Elsevier
• Subjects: active sites; Catalysis; catalytic activity; Chemistry; Co-ZSM-5 packed RF plasma; desorption; diagnostic techniques; Exact sciences and technology; fluorescence; General and physical chemistry; Ion-exchange; Laser-induced fluorescence; mass spectrometry; MS-TPD; NOx removal; Optical emission spectroscopy; radio waves; Surface physical chemistry; temperature; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Zeolites: preparations and properties; Laser-induced fluorescence; Optical emission spectroscopy; Co-ZSM-5 packed RF plasma; NOx removal; MS-TPD; Nitrogen oxide; Heterogeneous catalysis; Plasma; NO; Catalytic reaction; Laser; Fluorescence; removal
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2013.03.019

•NO LIF method was applied to investigate NOx-SCR with C2H4 over CoZSM-5 packed RF plasma.•Vibrational temperature and rotational temperature of N2 in Co-ZSM-5 packed and no packing RF plasma was determined.•MS-TPD method was used to analyze the enhancement of plasma pretreatment on NOy (y≥2) adsorption.•Gas phase reactive species generated by discharge can react with stable surface species formed.•Possible mechanism for HC-SCR of NOx over Co-ZSM-5 packed plasma was addressed. Inductively coupled plasma was used to study the removal of NOx from NO/N2/O2/C2H4 mixtures in Co-ZSM-5 packed radio frequency (RF) plasma. Laser-induced fluorescence (LIF), optical emission spectroscopy (OES), and mass spectroscopy temperature programmed desorption (MS-TPD) were applied to investigate the effects of the plasmas parameters, such as discharge power (Pdis), discharge pressure (p) on the concentration of reactive species in the gas phase or stable surface species formed over catalyst active sites. Rotational and vibrational temperatures of N2 in Co-ZSM-5 packed and no packed RF plasmas were also analyzed. Possible mechanism for the NOx-selective catalytic reduction (SCR) with C2H4 over Co-ZSM-5 packed RF plasmas was addressed.