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

摘要

The simultaneous removal of NOx and paniculate matter(PM) from diesel exhaust is investigated over a mixed metal oxide catalyst of Lao 9 ko i CoO_3 loaded on gamma-Al_2 O_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.