Since Levy and Boudart first disclosed the similarity of catalytic properties between tungsten carbide and platinum in 1973, the catalytic properties of tungsten carbide have aroused great interest in the scientific community. So far, the application of tungsten carbide as a catalyst has been extensively studied experimentally and theoretically. The results show that tungsten carbide has good catalytic performance in a series of noble metal catalytic reactions.

Cadmium selenide nanocrystals are the most widely studied and promising class of II-VI semiconductor nanocrystals. They have attracted worldwide attention due to their important non-linear optical properties, luminescent properties and other physical and chemical properties.

In recent years, in the application of automobile, energy and other fields, materials need to have the properties of corrosion resistance, high temperature resistance, heat conduction and so on. Special ceramics are needed to meet the development of its application. Zirconium tungstate material has negative expansion. It has strong isotropic negative thermal expansion effect in the temperature range of 0.3-1050K. Its negative thermal expansion coefficient (NTE) is -9*10-6K^-1, which is one of the hotspots in the research of negative expansion materials.

With the development of science and technology, the preparation and processing methods of materials have made great progress. Arc plasma technology is a process that has been rapidly popularized in recent years. It is widely used in industrial fields such as plasma welding, cutting, spraying, melting and other materials preparation and processing, as well as emission electric light sources, microwave power tubes, vacuum tubes, and ion bodies. Fields such as propellers.

At present, wolframite is the main resource consumed in tungsten smelting in China, and the basic reserves of wolframite resources will be exhausted in a few years. In addition, most of the newly discovered tungsten resources are complex scheelite resources, which has shown the absolute predominance of scheelite. Therefore, the development of scheelite resources to replace wolframite is a strategic choice for the sustainable development of tungsten industry in China.

Ultrafine grained tungsten-cobalt cemented carbide has high hardness and high strength, which is widely used in many fields such as woodworking tools, dental tools, metal processing and wear-resistant materials. The properties of ultrafine cemented carbides are closely related to grain size.

Superalloy is a kind of alloy based on iron, nickel and cobalt, serving in high temperature environment, withstanding severe mechanical stress and having good surface stability. It is not only the key material for high temperature components of Aeronautical and aerospace engines, but also the indispensable important material for naval ships, energy, petrochemical and other industrial fields.

Tungsten bronze compounds are a kind of important inorganic compounds. Tungsten ions in these compounds exist in the mixed valence states of W₆⁺, W₅⁺ and W₄⁺, so that the overall charge of the compounds is balanced. Rich crystal structure, tunneling structure and this special valence state make it have excellent properties, such as electronic and ionic conductivity, superconductivity, optical properties, etc. Its applications in secondary batteries, electrochromic, near infrared absorption and chemical sensors have attracted extensive research interest.

High specific gravity tungsten alloys are a kind of tungsten-based alloys, which are composed of Ni, Fe, Co, Cu, Mo, Cr and other elements. Their density is as high as 16.5-19.0g/cm³. They are also known as high density tungsten alloys.

Benzaldehyde is a common intermediate for dyestuff production, and also an important raw material for preparing fine chemicals such as medicine, perfume and coatings. Traditionally, the main production methods of benzaldehyde are oxidation of toluene or chlorination hydrolysis of toluene. However, they have many problems, such as complex process, halogen residue and low selectivity.