Comprehensive treatment strategy for diesel truck exhaust

At present, diesel vehicles still play an irreplaceable role in the traditional energy field in China. Diesel vehicle exhaust contains hydrocarbons, carbon monoxide, nitrogen oxides, and particulate matter, which can lead to haze weather, photochemical smog, and the greenhouse effect; endanger human health; and damage the ecological environment. In 2020, the number of motor vehicles in China reached 372 million, and the number of automobiles reached 281 million, of which 20.92 million are diesel vehicles, accounting for only 5.6% of the number of motor vehicles and 7.4% of the number of automobiles. Nevertheless, diesel vehicles emitted 88.8% of nitrogen oxides and 99% of particulate matter in total vehicle emissions. Diesel vehicles, especially diesel trucks, have become the top priority of motor vehicle pollution control. However, there are few reviews on the comprehensive treatment of diesel vehicle exhaust. This review provides an overview of exhaust gas composition, hazards, and treatment techniques. Phytoremediation, three-way catalytic conversion, rare earth catalytic degradation, and nanoscale TiO2 catalytic degradation are briefly described.

Automated summary

Diesel vehicles in China still have a significant impact on the environment due to their exhaust emissions. Despite accounting for a small proportion of the total number of vehicles, diesel vehicles emit a large amount of nitrogen oxides and particulate matter. The control of diesel vehicle pollution is a top priority in China, yet there are limited studies on comprehensive exhaust treatment. This review provides an overview of exhaust gas composition, hazards, and treatment techniques, including phytoremediation, catalytic conversion, and nanoscale TiO2 catalytic degradation.