Tungsten-added type nanometre titanium dioxide catalyst for flue gas denitrification and preparation method for catalyst

Abstract

The invention discloses a tungsten-added type nanometre titanium dioxide catalyst for flue gas denitrification and a preparation method for the catalyst. The tungsten-added type nanometre titanium dioxide catalyst for the flue gas denitrification comprises the components by weight percent: 3-10% of WO3, 1-4% of SO4<2-> and the balance being TiO2. The tungsten-added type nanometre titanium dioxide catalyst for flue gas denitrification is large in specific surface area, simple in process, easy to operate, low in energy consumption, environmentally friendly, and beneficial to improving the acidity of a carrier and improving the final denitrification performance of the catalyst. The preparation method comprises the following steps: hydrolyzing a titaniferous solution prepared by adopting a sulphuric acid method as a raw material to obtain metatitanic acid, sequentially sieving and washing to prepare metatitanic acid slurry, uniformly stirring the obtained metatitanic acid slurry, then adding ammonium sulphate and tungstate, then performing press-filtering, and conveying a filter cake to a rotary kiln to obtain a product, namely, the tungsten-added type nanometre titanium dioxide catalyst for the flue gas denitrification.

Description

technical field [0001] The invention relates to a catalyst and its preparation method, in particular to a catalyst for denitrification of flue gas [0002] A preparation method of a tungsten-type nano-titanium dioxide catalyst. Background technique [0003] The nitrogen oxides produced 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. With the sustained and rapid development of my country's economy, the consumption of coal resources is increasing, 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. The country is about to issue a mandatory denitrification policy for industrial furnaces such as power plants, steel plants, and glass plants. Currently, thermal powe...

AI Technical Summary

Problems solved by technology

However, the NO2 produced by the decomposition of nitric acid is highly toxic and seriously pollutes the environment, and nitric acid and barium carbonate are also dangerous goods, which are not easy to store

[0006] Chinese invention patent application publication CN 101757907A discloses a tungsten-containing titanium dioxide powder used for the preparation of honeycomb SCR denitration catalyst and its preparation method. The body does not contain SO42- which is not conducive to the improvement of molding and denitrification activity

[0007] Chinese Invention Patent Application Publication No. CN 102416333 A discloses a tungsten-added nano-titanium dioxide specially used for flue gas denitrification catalyst and its manufacturing method. The particle size is controlled, so the particle size and specific surface area of ​​nano-titanium dioxide cannot be stably guaranteed.