Automobile tail gas filtering method

Abstract

The invention discloses an automobile tail gas filtering method. In the method, automobile tail gas passes through an oxidation catalytic converter, and then passes through a particle catalytic filter. The method is characterized in that the particle catalytic filter is coated with a catalyst; the active components of the catalyst comprise precious metal elements, cerium, zirconium and transition metal elements, wherein based on oxide, the mass ratio of the precious metal to cerium oxide to zirconium oxide to transition metal oxides is equal to (1-10) to (20-40) to (10-20) to 30, the mass ratio of cerium to zirconium is equal to 1 to (0.5-2), and the content of the precious metal in the oxidation catalytic converter is less than the content of the precious metal in the particle catalytic filter. The method can be used for fully utilizing heat of waste gas, simplifying a heat control system and reducing the energy consumption.

Description

technical field [0001] The invention relates to the field of filtration, in particular to a method for filtering automobile exhaust gas. Background technique [0002] Exhaust emissions from automobiles are one of the main sources of air pollution, and the pollutants mainly include hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NO X ), particulate matter (PM) and sulfur dioxide and other harmful substances. These harmful pollutants directly endanger people's physical and mental health and cause serious pollution to the environment. All countries in the world have invested a lot of manpower, material resources and financial resources to control the pollution of vehicle exhaust emissions. They have formulated vehicle exhaust emission standards and are becoming increasingly strict, requiring all motor vehicle exhaust emissions to meet the requirements of the standards. [0003] With the increasing regulation of particulate emissions from motor vehicles, the applicat...