Special nano-titanium dioxide for flue gas denitrification catalyst and preparation method of special nano-titanium dioxide

Abstract

The invention discloses special nano-titanium dioxide for a flue gas denitrification catalyst. The special nano-titanium dioxide contains the following components in percentage by mass: 0.8%-5% of SO4<2->, 95%-99% of TiO2, 2%-3% of rutile titanium dioxide and 1%-2% of anatase titanium dioxide. The invention provides the special nano-titanium dioxide for the flue gas denitrification catalyst and apreparation method of the special nano-titanium dioxide. One or more methods of freeze drying, vacuum drying, pneumatic drying and spray drying in the step (S3) are adopted; and moisture is removed byvirtue of an industrially common drying method, so that the pulverization is facilitated; by adding sulfuric acid or ammonium sulfate or titanyl sulfate, particularly ammonium sulfate in the step (S2), the surface acidity of TiO2 can be substantially increased, and the denitrification activity of the final catalyst is increased; and the process and the material in the preparation method are simple, and prepared nano-titanium dioxide is large in specific surface area and high in TiO2 content.

Description

technical field [0001] The invention relates to the technical field of nano-titanium dioxide special for catalysts, in particular to a special nano-titanium dioxide for flue gas denitration catalyst and a preparation method thereof. Background technique [0002] The nitrogen oxides generated by coal combustion are mainly nitric oxide (accounting for 95% of the total nitrogen oxides) and nitrogen dioxide (accounting for 5% of the total nitrogen oxides), which are very toxic to humans and damage plants. Formation of photochemical smog and acid rain. The consumption of coal resources continues to increase, and the emission of NOx in the atmosphere is also increasing rapidly, which has constituted a huge threat to the ecological environment and people's health. [0003] The flue gas denitrification catalytic reaction is a surface reaction, and the speed of the reaction depends on the degree of surface contact between the reactant and the catalyst. For the catalyst titanium diox...

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Problems solved by technology

[0004] The nano-titanium dioxide produced by the prior art method has the following defects: one or more of modifiers, buffers, dispersants, inhibitors, accelerators, masking agents, and additives are included, and these non-catalytic substances occupy the titanium dioxide. A certain proportion of the total substance content of the white powder makes the content of TiO2 not high enough and the catalytic effect is not good enough; the specific surface area of ​​the prepared titanium dioxide is not large enough and needs to be improved