What are the current methods for treating automobile exhaust?

[Elise]

There are mainly the following methods for treating automobile exhaust: 1. Direct method: First, the carbon particles in diesel engine exhaust are captured by a collector and catalytically converted. The nitrogen oxides in the exhaust are then reduced or directly decomposed in a second catalytic converter using a suitable reducing agent. 2. Indirect method: Simultaneously eliminate carbon particles and nitrogen oxides in the exhaust on a catalytic collector, i.e., use the particulate matter (PM) collected on the filter to reduce (NOx). Here is some additional information: 1. Introduction: Diesel engine exhaust has an extremely complex chemical composition, and the composition of the exhaust varies significantly with engine operating conditions. 2. Types: The emitted pollutants include carbon soot particulate matter (PM), nitrogen oxides (NOx), CO, and hydrocarbons (HC), among others.