Method for Pretreatment of Catalyst Carrier for Particle Trapping

Abstract

The invention relates to a pretreatment method of a catalyst carrier for particle capture, comprising the following steps: the diameter of the catalyst carrier is denoted as d, the porosity is denoted as P, the sealing height of the air inlet end is denoted as h, and the sealing height of the gas outlet end is denoted as is H, and the density of the sealing agent is recorded as ρ; according to (πd 2 ·h·P·ρ) / 4 is measured by taking the sealing agent at the inlet end and placing it in a flat-bottomed container, slowly immersing the inlet end of the catalyst carrier into the sealing agent, so that the sealing agent is completely absorbed by the air inlet of the catalyst carrier end absorption; according to πd 2 ·H·P·ρ / 4 Take out the mass of the sealing agent at the gas end and place it in a flat-bottomed container, and slowly immerse the gas outlet end of the catalyst carrier that has absorbed the sealing agent into the sealing agent to allow the hole to be sealed The catalyst carrier is completely absorbed by the inlet end of the catalyst carrier, and the particle capture is completed by the pretreatment method of the catalyst carrier. The method of the invention can significantly reduce the back pressure of the finished catalyst after the filter-type carrier is coated, and the method of the invention is simple and easy to implement.

Description

technical field [0001] The invention relates to a pretreatment method of a catalyst carrier for particle collection, and belongs to the technical field of preparation methods of catalysts for automobile tail gas collection. Background technique [0002] Particulate matter (Particulate Matter, PM) and nitrogen oxides (NOx) are the main pollutants emitted by diesel engine exhaust. According to the "China Motor Vehicle Environmental Management Annual Report (2018)" by the Ministry of Ecology and Environment, the number of diesel vehicles in my country in 2017 was 19.567 million, accounting for only 9.4% of the total number of vehicles in the country, and the NOx emitted by diesel vehicles was close to 70% of the total vehicle emissions. %, PM exceeds 99%. PM particulate matter emission control is mainly achieved by adding filter catalysts. For example, diesel vehicles are equipped with DPF catalysts (Diesel Particulate Filter, DPF). Coating the DPF carrier with a catalytic coat...

AI Technical Summary

Problems solved by technology

Asymmetric carrier coating can easily cause catalyst coating clogging, especially when the coating amount is high (>60g / L), the increase in back pressure is particularly obvious, and the high back pressure catalyst will lead to a sharp increase in vehicle fuel consumption increase and even cause the engine to stall