Effect of different exhaust parameters on NO conversion efficiency enhancement of a dual-carrier catalytic converter in the gasoline engine

The high NO₂ concentration in the gasoline engine exhaust gas is beneficial to improve the regenerative equilibrium performance of the catalytic particulate filter regeneration system. In this work, the effect of exhaust parameters on NO conversion efficiency of a dual-carrier catalytic converter is simulated. The reliable operating temperature range and NO₂ mass fraction distribution of dual-carrier catalytic converter under different exhaust parameters are analyzed and the simulation results are verified by the experimental values. The main results are presented as follows: (1) The maximum of NO conversion efficiency is 68% when the exhaust gas temperature is 600 K. (2) The maximum value of NO conversion efficiency is increased by 30% when the exhaust gas flow is reduced from 0.025 kg/s to 0.01 kg/s (3)The maximum value of NO conversion efficiency is increased by 14% when the oxygen concentration from the exhaust is increased from 1.4% to 5%. (4) The orthogonal experimental results show that when the exhaust gas temperature is constant at 600 K, the exhaust gas flow has the most significant influence on the NO conversion efficiency. Finally, some guidelines are proposed to improve the NO conversion efficiency of the dual-carrier catalytic converter.