Honeycomb manganese denitration catalyst and preparation method thereof

Abstract

The invention relates to a honeycomb manganese denitration catalyst and a preparation method thereof. The method includes the following steps that manganese salt and a complexing agent are dissolved in water, titanium dioxide is added and stirred, ultrasonic dipping, drying and grinding are conducted, and Mn-Ti oxide solid particles are obtained, wherein the molar ratio of the manganese salt to the complexing agent is (65-187):1; metal salt and cerium salt are dissolved in water to obtain a mixed metal solution, wherein metal salt is at least one of ferric salt, cobalt salt, lanthanum salt, antimony salt and nickel salt; a pore-forming agent, an adhesive, an extrusion aid, a reinforcing agent, the Mn-Ti oxide solid particles and the mixed metal solution are mixed and formed into a honeycomb blank, and drying and forging are conducted. The catalyst is good in active component dispersity, is not easily sintered, good in pore structure, large in porosity and high in mechanical strength, the axial compressive strength of the catalyst is 4.7-5.1 MPa, and the radial compressive strength of the catalyst is 1.2-1.4 MPa. The porosity of the catalyst is 84-90%. The catalyst prepared through the method has relatively high denitration activity in the range of 120-250 DEG C and is suitable for low-temperature denitration.

Description

technical field [0001] The invention relates to a catalyst, in particular to a honeycomb manganese-based denitration catalyst and a preparation method thereof. Background technique [0002] Nitrogen oxides (NO x ) is one of the main air pollutants, and it is the precursor to acid rain, secondary fine particles and other problems. Currently, in NO x Among the removal technologies, selective catalytic reduction (SCR, Selective Catalytic Reduction) denitrification has attracted widespread attention from all over the world for its mature technology and good denitrification effect, and is the most widely used flue gas denitrification technology in the world. [0003] At present, the widely used commercial catalysts are mainly V 2 o 5 -WO 3 / TiO 2 or V 2 o 5 -MoO 3 / TiO 2 , but this kind of catalyst has the disadvantages of narrow reaction window, high activation temperature, high denitrification activity only at 350-400 ° C, and vanadium is harmful to human body and env...

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Problems solved by technology

The active components in manganese-cerium-titanium system catalytic materials are oxides of different valence states, which require manganese to be oxidized during the calcination process of the catalytic material. This is mainly because the melting point of manganese-cerium salt is low, and cerium has a combustion-supporting effect. The organic additives added in the molding process are very easy to burn, which makes the internal temperature of the honeycomb catalytic material too high, resulting in an excessive temperature difference between the inner and outer surfaces. while cracking

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