Effect of Plasma on the Hybrid Plasma-catalytic Removal of Hydrocarbons, Nitrogen Oxides and Diesel Soot

摘要

Combining temperature programmed reaction (TPR) and isothermal reaction, effect of plasma on hybrid plasma-catalytic removal of HC, Nox and diesel soot was studied under simulated diesel engine exhaust condition. TPR results indicate that both the maximum removal rate of NQx and the ignition temperature of diesel soot decreases a little after adding plasma, changing from 76.1% and 283.2 ℃ to 72.2% and 252.6 ℃ respectively when molar ratio of C_3H_6/NO in the feed gas is 1:1. FT-IR results show that there is no detectable CO and NO for all of these experiments. As for C_3H_6 and NO_2, there is still some remaining after plasma reaction, but little after catalytic reaction and none after plasma-catalytic reaction. As for N_2O, there is a little produced by plasma, but none after adding catalyst. The concentration of CO_2 increases by the sequence of plasma, catalysis, and plasma-catalysis.