SCR denitration catalyst and preparation method thereof

Abstract

The invention relates to a preparation method of an SCR denitration catalyst, which comprises the following steps: (1) Al2O3 sol is prepared, which comprises the steps that hot ammonia, the Al2O3 is added in drops into the ammonia and then HCI is added and the mixture is stirred; (2) Al2O3-SiO2-TiO2 composite sol is prepared, which comprises the steps that tetratethoxy-silane, butyl titanate, deionized water are sequentially put into ethanol to be aging and then the sol prepared by step (1) is adding to be stirred and aging; (3) vector is coated, which comprises the steps that cordierite honeycomb immersed into the sol of step (2) and the raffinate in a channel is cleaned, dried and roasted after being taken out; (4) active component impregnating solution is prepared, which comprises the steps that lanthanum nitrate, ammonium metavanadate and ammonium paratungstate are dissolved into the deionized water after being mixed together and oxalate acid is added to be aging; (5) the active component is loaded, which comprises the steps that the vector of the step (3) is immersed into the impregnating solution of the step (4) and then the raffinate in the channel is cleaned to be dried and roasted. The invention also relates to the denitration catalyst which is prepared by the method.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst used in SCR denitrification of flue gas in a thermal power plant and a preparation method thereof. Background technique [0002] According to statistics, thermal power installed capacity occupies a relatively large proportion in the field of power generation. For example, thermal power installed capacity accounts for more than 74% of China's installed power generation capacity. 2 and dust, NO x It is also a major pollutant. Expected to NO by 2010 x Emissions will further increase, for example, China may reach 5.5 million tons, becoming the most important pollutant emissions from thermal power plants. Countries, including China, have tightened restrictions on NO x Various regulations and policies on emissions are also being introduced or will be introduced soon, so the control of NO x emissions have drawn widespread attention from all walks of life. [0003] Compared with other techn...

AI Technical Summary

Problems solved by technology

The carrier aluminum and titanium elements prepared by this method form a layered structure, and the underlying Al and active components cannot be fully contacted, which limits the performance of the catalyst.

[0009] At present, the SCR catalysts used in industry are mainly based on TiO 2 as the carrier, V 2 o 5 or WO 3 -V 2 o 5 Composite oxide is the active component. The actual engineering test proves that these two catalysts have high durability and good adaptability. However, due to the simple components, they are sensitive to sulfur and water vapor, and the catalyst will be absorbed by the flue gas. Dust wear, blockage and poisoning by arsenic, alkali metals and other substances, the deactivation is more serious