Tungsten has excellent physical properties, such as high melting point, high density, high hardness, excellent high temperature strength and high temperature plasticity. Tungsten and its alloys are widely used in equipment manufacturing industry, iron and steel industry, electric power, information industry, petrochemical industry, aviation and aerospace industry, military industry and other fields. The application of new technology and materials of great importance in national defense occupy an important position in our national economy.

Nitrogen oxide pollution is becoming more and more serious. Coal-fired power plants are the largest source of air pollution in China. The state stipulates that the pollutant flue gas needs denitrification to meet the emission standards. SCR is the mainstream denitrification technology at home and abroad, accounting for more than 90% of the flue gas market, and is the most mature technology of flue gas denitrification.

Tungsten aluminium alloy is a new type of alloy material. It consists of tungsten and aluminium. It has high temperature resistance of tungsten and light weight and oxidation resistance of aluminium. It is a special lightweight alloy material with high temperature resistance, high hardness, high wear resistance and high strength, and can be used as structural material of aerospace engine.

Nitrogen oxides (NO, mainly NO and NO₂) are important atmospheric pollutants, which can directly harm human health, especially the respiratory system, and can cause acid rain, photochemical smog and haze and other important environmental problems. NH₃ selective catalytic reduction is a technology widely used in fixed source flue gas denitrification represented by coal-fired power plants and mobile source NOx emission control represented by diesel vehicles.