Simultaneous catalytic removal of NOx and diesel PM over La_{0.9}K_{0.1}CoO_3 catalyst assisted by plasma

Article type: Research Article

Authors: PEI, Mei-xiang | LIN, He | SHANGGUAN, Wen-feng | HUANG, Zhen

Affiliations: Institute of Internal Combustion Engine, Shanghai Jiaotong University, Shanghai 200030, China

Note: [] Corresponding author. E-mail: pmxada@sjtu.edu.cn

Abstract: The simultaneous removal of NOx and particulate matter (PM) from diesel exhaust is investigated over a mixed metal oxide catalyst of La_{0.9}K_{0.1}CoO_3 loaded on γ-Al_2O_3 spherules with the assistant of plasma. It was found that NOx was reduced by PM in oxygen rich atmosphere, the CO_2 and N_2 were produced in the same temperature window without considering the N_2 formed by plasma decomposition. As a result, the temperature for the PM combustion decreases and the reduction efficiency of NOx to N_2 increases during the plasma process, which indicated that the activity of the catalyst can be improved by plasma. The NOx is decomposed by plasma at both low temperature and high temperature. Therefore, the whole efficiency of NOx conversion is enhanced.

Keywords: simultaneous removal, plasma assisted catalysis, NOx, PM, diesel

Journal: Journal of Environmental Sciences, vol. 17, no. 2, pp. 220-223, 2005