Nano titanium dioxide (TiO2) for flue gas denitration catalyst and preparation method thereof

Abstract

The invention provides a special nano titanium dioxide (TiO2) for a high-performance denitration catalyst and a preparation method thereof. The nano-TiO2 comprises the following components in mass percentage: 80-95% of TiO2 and 5-20% of SiO2; and the nano-TiO2 is prepared by a precipitation method, and precipitated precursors comprise TiOSO4 solution and silica sol. The preparation method comprises the following steps: dissolving metatitanic acid used as raw material with concentrated sulfuric acid to obtain titanyl sulfate solution; precipitating titanyl sulfate and the silica sol by the precipitation method to obtain metatitanic acid slurry; and washing the metatitanic acid slurry with de-ionized water, drying and baking to finally obtain the special nano-scale TiO2 for the denitration catalyst. The preparation method has the following advantages: (1) the TiO2 obtained by the precipitation method has the characteristics of small and uniform crystal particles, large specific surface area and more surface lattice defects so that the TiO2 and active components of the catalyst such as vanadium and tungsten interact strongly so as to improve properties of the catalyst; and (2) the cheap silica sol is utilized as an additive, which improves surface acidity and specific surface area of the nano-TiO2 and causes no toxic or harmful substances after the silica sol is baked.

Description

technical background [0001] The nitrogen oxides produced by coal combustion are mainly nitric oxide (95% of the total nitrogen oxides) and nitrogen dioxide (5% of the total nitrogen oxides), which are very toxic to humans and damage plants. Form photochemical smog and acid rain. With the sustained and rapid development of my country's economy, the consumption of coal resources has continued to increase, and the emission of NOx in the atmosphere has also increased rapidly, which has constituted a huge threat to the ecological environment and people's health. The country is also about to introduce mandatory denitration policies for industrial furnaces such as power plants, steel plants, and glass plants. [0002] NH in thermal power plant 3 -SCR denitration technology is the most efficient denitration technology, the core of which is the denitration catalyst. The base material of denitration catalyst is TiO 2 , The additive is WO 3 , The active ingredient is V 2 O 5 . TiO 2 The p...

AI Technical Summary

Problems solved by technology

At present, there are more than 60 domestic enterprises producing ordinary titanium dioxide, but only a few manufacturers can produce this kind of denitrification titanium dioxide, and the performance cannot be compared with foreign titanium dioxide.