Recently, diesel engine exhaust emission control by non-thermal plasma (NTP) technology has been shown to be promising. However, carbon and soot deposition on the inner surface of the NTP reactor for direct plasma processing decreased the efficiency of the plasma process throughout the experiments. In the present work, the feasibility of indirect plasma processing was investigated as an innovative and novel method compared to direct plasma processing. Air was directed through an NTP at an applied voltage of V_P-P = 7 kV and a flow rate of 1–4 L/min, and then, it was combined with engine exhaust gas at a flow rate of 5 L/min. In this case, the maximum conversion of NO_X was 64.9% at 4 L/min. However, for direct plasma processing at 5 L/min, NO conversion was 58%, which proves that the indirect NTP process can decrease NO_X concentration effectively. The maximum conversion for unburned hydrocarbon (UHC), carbon monoxide (CO) and carbon dioxide (CO₂) was obtained as 2%, 4% and 0.7% at 4, 2 and 3 L/min in indirect plasma processing; While their remove rate for direct plasma processing was 16.3%, −0.5% and 13.2%, respectively.

最近，采用非热等离子体（NTP）技术控制柴油发动机废气排放已被证明是有前景的。然而，用于直接等离子体处理的 NTP 反应器内表面上的碳和烟灰沉积降低了整个实验中等离子体处理的效率。在目前的工作中，研究了间接等离子体处理作为一种与直接等离子体处理相比的创新方法的可行性。空气在施加电压 V _{P- P} = 7 kV 和流量 1-4 L/min 下通过 NTP，然后以 5 L/min 的流量与发动机废气混合。在这种情况下，NO _X的最大转化率为4 L/min 时的64.9%。然而，对于5 L/min的直接等离子体处理，NO转化率为58%，这证明间接NTP处理可以有效降低NO _X浓度。在间接等离子体处理中，在 4、2 和 3 L/min 下，未燃烧碳氢化合物 (UHC)、一氧化碳 (CO) 和二氧化碳 (CO ₂ ) 的最大转化率分别为 2%、4% 和 0.7%；而直接等离子体处理的去除率分别为 16.3%、-0.5% 和 13.2%。