Ultrafine tungsten trioxide has special physical and chemical properties such as catalysis, photochromism, electrochromism, gas sensing and pressure sensing. So, it is widely applied in the fields of photocatalysis, solar absorption, sensor, military invisibility and fuel cell. And therefore, “How to Prepare Ultrafine Tungsten Oxide Powder More Environmentally Friendly and More Efficiently” has become a hot topic. Preparation of ultrafine tungsten trioxide is mainly to control the crystallization process. That is means to control the main two steps: 1. Microscopic…

Super grade tungsten trioxide is a grade of tungsten trioxide with the minimum purity of 99.98%. Its grade is WO3-0. The other two grades of tungsten trioxide are grade 1 and grade 2. Their grades are WO3-1 and WO3-2 respectively. Certainly, due to the difference in raw material, processing technology, processing equipment, etc., manufacturers will also produce a variety of different specifications of tungsten trioxide in the actual production process. The maximum percentage (%) of the impurity of the super…

Industrial grade tungsten trioxide refers to a type of yellow powder with an average particle size of less than 100 nm, a specific surface area of more than 9m^2/g and a purity of more than 99.95%. It is produced by using Chinese standard. It adopts ammonium paratungstate (APT) as raw material. It is widely applied in the production of petroleum catalysts, special paints, metal ceramics and ultrafine tungsten powder. Its CAS number is 1314-35-8. Preparation Adopting ammonium metatungstate (AMT) as…

Ultrafine tungsten oxide is a kind of high purity powder with small particle size and uniform distribution. Its specific surface area is large; Surface activity is high; Bulk density is low. It contains ultrafine yellow tungsten oxide (WO3), ultrafine blue tungsten oxide (WO2.90), ultrafine violet tungsten oxide (WO2.72) and ultrafine tungsten dioxide (WO2). Applications 1. As an intermediate product, it is applied to produce tungsten powder and tungsten carbide powder (WC powder), thereby producing tungsten products or tungsten carbide products.…

Optical grade tungsten trioxide is a type of light yellow powder of optical grade (10-^8 orders of magnitude). Its purity can reach 99.99%. The tungsten trioxide becomes dark orange if it is heated and restores its original color if it is cooled. The tungsten trioxide thin film with uniform surface is prepared by sol-gel method and direct current reactive magnetron sputtering method. The light transmittance and the structure of the film are measured by double beam UV-visible light spectrophotometer and…

Nano tungsten trioxide is a type of tungsten trioxide powder of nano grade that has the advantages of uniform particles, high activity and large specific surface area. Therefore, it has shown a large market potential and a bright future in the anode material and rechargeable li-ion cells. Nano grade tungsten trioxide has some crystal structures. They are orthorhombic, monoclinic, cubic or hexagonal. Among them, hexagonal tungsten trioxide has drawn much attention due to its special hexagonal channel. One-dimensional nanomaterials such…

Crystalline tungsten oxide is tungsten oxide powder of crystal grain, which is the largest particle in tungsten oxide powder, light yellow (yellow tungsten oxide) or blue (blue tungsten oxide) or brown (tungsten dioxide) or violet (violet tungsten oxide) in color. The crystal size has a very important effect on the material properties of tungsten oxide, such as photocatalytic material properties. If the particle size of tungsten oxide powder is smaller than the thickness of space charge layer, the time for…

Manganese tungstate is yellow and odorless powder with CAS No. of 14177-46-9, density of 7.324g/mL (25/4°C), molecular formula of MnWO4 and molecular weight of 302.77600. Producing Methods 1. By the metathesis reaction between manganous chloride and sodium tungstate solution to get manganese tungstate precipitation; After washing, drying at 1000°C. 2. By heating a certain percentage of manganese carbonate and tungsten trioxide. Storage Method It should be stored at room temperature in a sealed, dark, ventilated and dry environment. It must…

Potassium tungstate is a kind of white or colorless crystalline powder with monoclinic structure. It is insoluble in ethanol and soluble in water. The solubility in water (g/100ml) is 51.5g/20°C. Its chemical formula is K2O4W; Molecular weight is 326.03; CAS Number is 7790-60-5; Melting point is 921 degree celsius; Density is 3.12g/mL (25 degree celsius). It can be applied as analysis reagent, precipitation for alkaloid, and producing tungsten and bronze. Ecological Effect It is harmful to water. Do not pour…

Phosphotungstic heteropoly acid, also called Keggin type phosphotungstic acid, belongs to twelve phosphotungstic acid with the formula of H3PW12O40•nH20. It is a light yellow crystal or white powder. Different crystal water content cause difference in color. It is generally light yellow if it contains more crystal water; otherwise, it is white powder. It is soluble in water, alcohol, and ether, etc. Its solubility reaches the highest in ether. Keggin type phosphotungstic acid, as a solid acid with excellent catalytic performance,…