Honeycomb type low-temperature flue gas denitrification catalyst and preparing method

Abstract

The invention discloses a honeycomb type low-temperature flue gas denitrification catalystpowder and a preparing method thereof.The honeycomb type low-temperature flue gas denitrification catalyst powder is prepared from, by mass, 3.0-5.0 parts of vanadium oxide, 3.5-5.1 parts of molybdenum oxide, 0.1-1.0 part of tungsten oxide, 0.1-3.0 parts of manganese oxide, 0.01-0.1 part of phosphorus oxide, 0.01-0.05 part of boric oxide, 0.1-1.0 part of copper oxide and 84.75-92.68 parts of titanium dioxide.The preparing method comprises the steps that firstly, an active component solution is prepared; secondly, a catalyst is loaded with an impregnation method; thirdly, the consistent honeycomb type catalyst is prepared through extruding forming.According to the honeycomb type low-temperature flue gas denitrification catalyst powder and the preparing method thereof, the activity and catalytic capability of the low-temperature flue gas denitrification catalyst are effectively improved, the denitrification efficiency can reach 38% at 120 DEG C and reaches 95.1% at 210 DEG C, high industrial application value is achieved, and the honeycomb type low-temperature flue gas denitrification catalyst can be widely applied to NH3 selective catalytic reaction of nitric oxide in flue gas.

Description

a technical field [0001] The present invention relates to a catalyst, especially a kind of NH 3 Selective Catalytic Reduction (SCR) Removal of NO X Honeycomb catalyst and preparation method thereof. Two technical background [0002] Nitrogen oxides (NO X ) mainly comes from the combustion of fossil fuels, which can not only produce acid rain, but also react with hydrocarbons to form photochemical smog, which is one of the main sources of pm2.5 pollutants at present. Air quality has huge implications. [0003] NO X It mainly adopts the methods of combustion process and post-combustion treatment. At present, low nitrogen combustion (LNB), selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) technologies are mainly used in industry. LNB technology is to change the combustion method of fuel, and the efficiency is usually only 30-40%. The reaction temperature of SNCR technology is 850°C-1100°C, the highest efficiency of this technology is about 5...

AI Technical Summary

Problems solved by technology

The reaction temperature of SNCR technology is 850°C-1100°C, the highest efficiency of this technology is about 50%, and it will cause a large amount of NH3 to escape

The SCR technology uses NH3 as the reducing agent, and the efficiency can usually reach more than 80%. Its characteristic is that the catalyst V2O5-TiO2 has good catalytic activity in the temperature range of 300°C-420°C, but it is not suitable for industrial applications other than power plant boilers. Conditions, due to the low flue gas temperature, usually below 300°C, ordinary denitrification catalysts cannot be used normally

[0004] At present, the existing honeycomb low-temperature denitrification catalyst technology in China cannot be applied on a large scale. The main disadvantages are narrow application temperature range, low product strength, low removal efficiency, short practical application life, and no wear resistance.