Novel efficient denitration catalyst as well as preparation method and application thereof

Abstract

The invention discloses a novel efficient denitration catalyst as well as a preparation method and application thereof. The novel efficient denitration catalyst comprises the following components in percentage by weight: 3 wt%-40 wt% of silicon dioxide, 25 wt%-33 wt% of aluminum oxide, 32 wt%-55 wt% of phosphorus pentoxide, 5 wt%-10 wt% of a copper ammonia complex and 0.01 wt% to 0.1 wt% of ammonium fluoride. According to the invention, fluorine ions are introduced to modify a Cu-SAPO-34 molecular sieve catalyst synthesized by a one-step method, the method can promote nucleation and crystallization of the molecular sieve, and the Cu-SAPO-34 molecular sieve catalyst has high crystallinity, uniform particle distribution, large specific surface area and pore volume and proper acidity. The whole preparation process is safe and environment-friendly, and energy consumption is reduced. The molecular sieve catalyst can still maintain good low-temperature activity and a wide active temperature window at a high space velocity, and is suitable for a NOx purification process of a catalytic reactor in a motor vehicle aftertreatment system.

Description

technical field [0001] The present invention relates to molecular sieve catalyst preparation technology and motor vehicle tail gas NOx removal technology, in particular to a preparation method of a novel high-efficiency denitrification catalyst and its application in a motor vehicle aftertreatment system to remove NOx in tail gas by using ammonia selective catalytic reduction reaction . Background technique [0002] With the rapid development of science and technology and economy, the quality of life of the people has also been greatly improved, and the number of motor vehicles is increasing rapidly. There are nearly 50 cities across the country with more than one million cars. Against this background, air pollution in some cities in our country has intensified and smog occurs frequently. The Ministry of Environmental Protection analyzed the sources of PM 2.5 in 9 cities including Beijing, showing that motor vehicle exhaust emissions are the main source of urban air polluti...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to propose a novel high-efficiency denitrification catalyst preparation method in view of the problems of insufficient low-temperature activity, narrow activity temperature window, and high preparation cost of denitrification catalysts in the current motor vehicle aftertreatment system, in order to improve the deficiencies of the prior art. The new high-efficiency denitration catalyst prepared by this method is cheap, simple in process, and has excellent hydrothermal stability, and can maintain excellent NH in a wide temperature window. 3 -SCR catalytic activity

Images