Ionic liquid modified CuY molecular sieve catalyst as well as preparation method and application thereof

Abstract

The invention discloses a wide-temperature and high-efficiency ionic liquid modified CuY molecular sieve denitration catalyst as well as a preparation method and application thereof. Hydrophobic hydroxyl functionalized imidazole ionic liquid is introduced in the synthesis process of the CuY molecular sieve catalyst, so that more active centers and adsorption reaction sites are provided for denitration; meanwhile, hydrophobic groups in the ionic liquid can improve the water resistance of the catalyst, the modification of the ionic liquid on the pore channel structure further enriches the pore channel structure, increases the specific surface area, and enhances the size screening and confinement effect of the pore channel, so that the denitration reaction is promoted, and the adsorption of SO2 in the pore channel is inhibited; the sulfur resistance and the service life of the catalyst are improved. The catalyst is free of vanadium oxide, tungsten oxide, molybdenum oxide and other toxic components, non-toxic, harmless, economical, environmentally friendly and simple in preparation method, has richer pore channel structures and acid sites than traditional molecular sieves, and can achieve low-temperature selective catalytic denitration of industrial flue gas within the temperature range of 50-300 DEG C.

Description

technical field [0001] The invention relates to an ionic liquid modified CuY molecular sieve denitrification catalyst and a preparation method and application thereof, belonging to the field of environmental protection catalytic materials and industrial flue gas denitrification. Background technique [0002] Due to the rapid development of modern industry and national economy, industrial waste gas emissions have increased sharply, of which nitrogen oxides (NO x ) is one of the main air pollutants, and its annual emissions have reached tens of millions of tons. Under the increasingly severe environmental situation, especially the deteriorating air pollution, the state has successively issued a series of NO x emission reduction policy. The ever-upgrading pollutant discharge limit standards have brought unprecedented severe challenges to the development of thermal power, building materials and other industries and industrial kilns in the new era. At present, except for the p...

AI Technical Summary

Problems solved by technology

The Selective Catalytic Reduction (SCR) denitrification technology widely used in the power industry is the most mature. The active temperature window of the common vanadium-titanium-based catalysts is generally 300-450°C, but V2O 5 easily oxidizes SO2 to SO3, and reacts with NH3, H2O The reaction produces ammonium sulfate salt, which causes the surface of the catalyst to be clogged and ash-deposited and deactivated, and the V component is highly toxic

The flue gas temperature in the non-electric power industry is generally lower than 300°C. If commercial SCR technology is used, the flue gas needs to be reheated to above 300°C, resulting in high energy consumption and poor economic efficiency.

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