Monolithic nitrogen oxide selective reduction catalyst and preparation method thereof

Abstract

The invention discloses a monolithic nitrogen oxide selective reduction catalyst and a preparation method thereof. The monolithic nitrogen oxide selective reduction catalyst comprises a honeycomb ceramic matrix, a first coating, a second coating and active components, wherein the first coating is an Al2O3 coating, the second coating contains TiO2, CeO2 and ZrO2, and the active components include V2O5 and WO3. The process for applying the TiO2 second coating comprises the following steps: uniformly mixing anatase structural TiO2 solid powder and an adhesive, preparing into an applying slurry, impregnating the honeycomb ceramic matrix applied with the Al2O3 first coating in the applying slurry, blowing off residual liquid, drying, and roasting, thus finishing the application of the TiO2 second coating. Compared with the prior art, the method provided by the invention has the advantages of simple preparation process and low cost, and the prepared monolithic catalyst has higher activity when being used for selective reduction of nitrogen oxide in flue gas.

Description

technical field [0001] The invention relates to a catalyst for catalytic reduction of nitrogen oxides and a preparation method thereof, in particular to an integral catalyst for selective catalytic reduction of nitrogen oxides in flue gas and a preparation method thereof. Background technique [0002] Nitrogen oxides from stationary sources (power plants, industrial boilers and refineries) (hereinafter referred to as NOx, mainly NO and NO 2 ) is the main pollutant in the atmosphere, which leads to the formation of acid rain and photochemical smog, and causes damage to the human respiratory system. Therefore, all countries in the world have established strict emission standards for NOx emissions. [0003] Stationary source NOx can be controlled by improving combustion methods and flue gas denitrification technologies. Improved combustion methods include LNB (low NOx burner), OFA (overfired air technology) and reburning technology, SNCR (selective non-catalytic reduction ), ...

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Problems solved by technology

The catalyst prepared by this extrusion molding method has the disadvantages of low mechanical strength, poor heat transfer performance, and large amount of active components.

[0009] CN101234345A and CN1593752A etc. take aluminum base ceramics as matrix, Al 2 o 3 coated as a supported catalyst, this Al 2 o 3 The activity of supported catalysts will decrease due to the sulfation of the surface in practical applications

TiO in the above patents 2 coated or with TiO 2 Coatings are made of corresponding TiO 2 or with TiO 2 Sol to prepare, where TiO 2 Sol or TiO 2 The sols are all prepared using butyl titanate as the precursor and ethanol as the solvent, which is costly and complicated to operate, and the TiO in these sols 2 Low content, often requires multiple dips to apply a good coating

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