Tungsten copper (W-Cu) and molybdenum copper (Mo-Cu) are composed of respectively tungsten and molybdenum with copper, which called two-phase composites and has many advantages when it used in some devices with high power, such as high hardness, high strength, high melting point, excellent chemical stability, excellent thermal and electrical conductivity and lower coefficient of thermal expansion. As a kind of electronic packaging heat sink material takes place of conventional materials gradually, the related researchers make an intensive study on tungsten copper, which includes add active agents, change powder properties to improve the sintering density of tungsten copper materials.

However, the conditions of some industries today have become more and more strict (including temperature, pressure, power, etc.), which requires tungsten copper has better properties. Inspired by tungsten carbide with gradient structure, the Japanese researcher propose new concept of functional materials with gradient structure and from the preparation process structure, computer simulation and forecasting has done sufficient research, have also made substantial progress, so that it plays an important role in some high-power devices. Tungsten copper composite material is kind of two-phase psudoalloy, which composed of two metals tungsten and copper with a great difference in physicochemical properties.

Its properties will change with the structure. Viewed from the aspect of gradient structure, it can has one end with a high hardness, high melting point, tungsten or copper content is low high-density tungsten copper, while the other end is a good electrical and thermal conductivity and high plasticity of copper or copper content of tungsten, copper, in this way the formation of gradient structure having a tungsten-copper composite materials have a good specificity and a broader application prospect.

When the temperature of waste gas is higher than 500℃, Vanadium catalyst directly oxidation of NH₃is significantly enhanced, resulting in a significant reduction in the removal rate of NOx. Under high temperature, the WO_3-TiO₂ system has better catalytic activity and high temperature stability compared to the traditional V₂0₅-W0₃/TiA system. A method for preparing WO_3-TiO₂ catalyst is described in this paper, steps are as follows:

1. Mixing ethanol, tetrabutyl titanate and glacial acetic acid by volume ratio 2:1:1, get solution A;
2. Dissolve ammonium paratungstate in the oxalic acid solution with mass concentration of 5% to obtain solution B, in which the mass ratio of ammonium paratungstate: oxalic acid is 1.6:1;
3. Drop a certain amount of solution B into solution A slowly, in which the quality ratio of ammonium paratungstate and tetrabutyl titanate is 0.029:1~0.11:1, stirring constantly to form a uniform and stable sol;
4. Static settling for 40~60 hours, dry in an oven at the temperature of 50~ 60℃ for 16~30 hours to get a dry gel;
5. Grind the dry gel in a mortar for 30~50 minutes, then calcine in the muffle furnace at 550~650 ℃ for 3~6 hours, get the high temperature SCR catalyst WO_3-TiO₂ with the active component WO₃.

The catalyst in this paper has the advantages like: simple process and low production cost, with high active at the temperature of 450~550℃, higher denitrification rate, long service life, high thermal stability.

More than 90% of the thermal power plants deal with the flue gas denitrification using SCR which is short for Selective Catalytic Reduction, making SCR process widely use. The cleaning and regeneration of the catalyst is not only one of the effective methods to reduce the running cost of flue gas, but also can reduce the environmental pollution caused by solid waste. This paper introduces a kind of Regeneration Solution of SCR Denitration Catalyst.

The components of it are as follows: Penetration enhancer (JFC) takes the 1‰~5wt‰ of total content, surfactant take 1‰~5wt‰, peregal take 0~5wt‰, ammonium metavanadate take 1%~4wt%, ammonium paratungstate take 6%~12wt% and ammonium molybdate take 2~6wt%, distilled water and acid take the remained contents.
The acid is the role of adjusting pH value in range 5~7, can be anyone of citric, oxalic and acetic acid.

The advantages of Regeneration Solution of SCR Denitration Catalyst are as follows:
1. Make-up active ingredients by the time cleaning denitration catalyst, which can significantly improve the activity of deactivation, and recover the activity as high as 90~105%;
2. Nonionic surfactant added in the regeneration solution not only improves the cleaning ability of catalyst, but also cause no damage to the catalyst carrier and other active components;
3. Catalysts after regeneration can be completely normal used making the service life reach more than 95% as the new catalyst.

TG (Thermal Gravity Analysis) is a term of thermodynamics, called thermal gravimetric analysis. Its meaning is: The sample in the specified temperature curve (rate), the rate decreases with its weight / ratio analysis. From the curve we can know the weight of sample reducing at certain temperature, and then it shows that the decomposition temperature of the sample at this occurrence (or other chemical reactions) is the most severe. TG Category 1, static method (isothermal): sample at a constant temperature, known as the "constant weight loss." TG Category 2, the dynamic method (temperature method): the sample under constant temperature, known as "TGA curve."

During the inspection process, the first steep, placing synthetic product in a muffle furnace, burning it 3h at 400 ℃ to obtain the tungsten trioxide powder samples of different doping amount of tungsten trioxide, and then getting the results via TG at FIG 50-400 ℃, characterizing it by the percentage change to determine the tungsten trioxide complex. From the TG graph , we can see when the temperature reaches at 350 ℃ , TG curve is approximately straight line, which indicates that synthesis product is lost when the temperature is about 350 ℃ . Weight of the synthetic product constantly decreases with temperature increasing.

Next, the synthesized product was characterized by X-ray powder diffraction analysis, the diffraction peaks can be found in standard synthetic products that were monoclinic phase product coincide, and there are not impurity peaks, which show the composite tungsten oxide does not cause polymorphs variety. In summary, the tungsten trioxide complex becomes into the admixture does not have a change in crystal form molybdenum trioxide.