The addition of lanthanum to pure molybdenum not only improves the strength and toughness of molybdenum, but also increases the recrystallization temperature of molybdenum and improves its high temperature resistance. Therefore, lanthanum-doped molybdenum alloys are used to replace pure molybdenum in the preparation of electric heating materials, wire cutting electrode materials, electric light sources and other industries.

Epoxides are a kind of fine chemical raw materials and pharmaceutical intermediates with wide applications. The most important way to form epoxides is the epoxidation of olefins. Epoxidation plays an important role in both organic synthesis and chemical industry. Therefore, the study of olefin epoxidation has always been a hot spot in chemical industry.

Tungsten carbide ceramics are widely used in aerospace, machinery industry, electronic power, armor, chemical industry and other fields because of their excellent performance in strength, wear resistance and corrosion resistance. Among the various properties mentioned above, the hardness of tungsten carbide is still insufficient compared with the other properties. Therefore, how to improve the hardness of tungsten carbide so as to achieve a balanced performance in all aspects, so that it is more suitable for various fields.

With the continuous concern of haze, the control of air pollution has become more and more important. Nitrogen oxides are one of the main air pollutants and important precursors to induce photochemistry smog and acid rain. About 60% of them are discharged from coal-fired power plants, industrial boilers and cement plants.