Nano titanium dioxide special for flue gas denitrifying catalyst and preparation method thereof

Abstract

The invention provides a high-performance nano titanium dioxide special for flue gas denitrifying catalyst and a preparation method of the high-performance nano titanium dioxide. The nano titanium dioxide comprises 0.8 to 5% of sulfate ion and the balance of TiO2 by mass percent. The preparation method comprises the following steps: taking metatitanic acid which is prepared by a sulfuric acid method as raw material; adding pore-forming agent, stirring and adding a sulfate radical precursor; stirring, conveying mixture to a rotary kiln, and drying and calcining the mixture to obtain the nano titanium dioxide with relatively high specific surface area and relatively strong surface acidity. The preparation method has the advantages that: 1), after addition of the sulfate radical precursor, the acidity of the TiO2 surface can be improved greatly and the denitrifying activity of a final catalyst can be improved; 2), when ammonium sulfate is used, because the ammonium sulfate is non-acidic, the corrosion on a stirrer and the rotary kiln can be reduced, a requirement for equipment material is lowered, and the investment cost of the equipment is reduced; 3), the preparation method is simple, the drying and calcining processes are carried out in the rotary kiln, so that the equipment use is reduced and the energy consumption is lowered; and 4) the pore-forming agent can increase the specific surface area of the nano titanium dioxide, and is cheap and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a nano-titanium dioxide special for flue gas denitrification catalyst and a manufacturing method thereof. technical background [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. With the continuous 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. [0003] NH for thermal power plants ...

AI Technical Summary

Problems solved by technology

However, the NO produced by the decomposition of nitric acid 2 It is highly toxic and seriously pollutes the environment, and nitric acid and barium carbonate are also dangerous goods, which are not easy to store