Titanium dioxide sol and coating type denitration catalyst

Abstract

The invention discloses a titanium dioxide sol and a coating type denitration catalyst. The titanium dioxide sol is prepared from a titanium dioxide precursor, a dispersing agent, organic chelating agents, alcohol solvents, deionized water and auxiliaries, wherein the organic chelating agents include one or two of acetylacetone, tert-butyl ketone and 1,3-diphenyl-1,3-propanedione, the alcohol solvents include one or two of methanol, ethanol, isopropanol and n-butanol, and the auxiliaries include one or two of methylcellulose, polyethylene glycol-400, sodium dodecyl sulfate, hexamethylene tetramine, tetrahydrofuran and ethanolamine. A substrate of the coating type denitration catalyst is made of cordierite honeycomb ceramics, and the substrate is coated with active components of a vanadium-tungsten impregnation solution, an iron-cerium impregnation solution or a manganese-cerium impregnation solution with the titanium dioxide sol as a carrier. The grain size of the titanium dioxide sol is at the nanometer level. A coating formed by the coating type denitration catalyst has high bonding fastness, coating capacity and solid content.

Description

technical field [0001] The invention relates to titanium dioxide sol and a coated denitration catalyst with the titanium dioxide sol as the carrier and the cordierite honeycomb ceramic as the matrix. Background technique [0002] Titanium dioxide (titanium oxide, TiO 2 ) sol has a variety of unique properties, so it is widely used in many technical fields. For example, a coated denitrification catalyst can be obtained by combining titanium dioxide sol as a carrier with certain metal oxides (active components) and coating it on a porous solid material substrate—it is the same as the denitrification catalyst prepared by kneading. Catalysts (kneaded particles without matrix materials) are more effective in treating nitrogen oxides (NOx) emitted from thermal power plants and motor vehicles. X ) pollution, its active components can be more fully utilized, and the total cost of controlling nitrogen oxide pollution is low. The reason is that the coating-type denitration catalyst...

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Problems solved by technology

However, after repeating the experiment of this study, it was found that the mass fraction (solid content) of the titanium dioxide in the titanium dioxide sol that acts as a carrier is still relatively low, resulting in a coating type with the titanium dioxide sol as the carrier and cordierite honeycomb ceramics as the matrix. The coating loading of the denitrification catalyst is also low (no more than 4wt%)

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