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84% yellow tungsten oxide may be used to produce high quality ultrafine tungsten carbide (WC) powder by carbonization method. The producing processes are shown as follows: 1. Mix yellow tungsten oxide (mass fraction of 84%) and carbon (mass fraction of 16%) by mixer, and granulate to particle (grain size of 3mm) by granulator, then dry and mixed material is obtained. 2. Move material to the rotary furnace for continuous reduction/carbonization, the original material changes during the reaction: WO3→WO2.9→WO2.72→WO2.0→W→W2C→WC WO3 was…

Micro fine yellow tungsten oxide’s producing method may be classified into three types including physical method, chemical method (liquid phase method) and comprehensive method in accordance with the reaction characteristics described in the theory of crystal nucleation. And the liquid phase method can be divided into precipitation method, hydrothermal method, a microemulsion method, and sol-gel method according to different producing processes. The yellow tungsten oxide is primarily prepared by controlling the crystallization process, and it mainly goes through two steps:…

Yellow nano tungsten oxide is prepared by hydrothermal method using tungstic acid as precursor and thiourea as basic adjuvant. The influence of different reaction conditions on the morphology and gas sensitivity of yellow tungsten oxide can be studied by changing the preparation temperature of the precursor and the content of thiourea. Transmission electron microscope (TEM) is used to characterize the synthesized product. The preparation temperature of precursor tungstic acid has important influence on yellow tungsten oxide synthesis. The spherical structure…

High purity yellow tungsten oxide nanopowder, also called high purity tungsten trioxide nanopowder, can be applied as a semiconductor gas sensor. Tungsten trioxide (WO3) is an n-type transition metal semiconductor that has been considered as one of the most promising new oxide gas sensing materials for detecting NOx, SOx, NH3, CO, hydrogen (H2) and hydrogen sulfide (H2S) and other gases. The principle of WO3 gas sensitive material is that when it is exposed to the specific gas, oxygen is adsorbed…

Yellow tungsten oxide nanopowder is also called tungsten trioxide nanopowder, which is an n-type semiconductor oxide material. As a photocatalyst, tungsten trioxide nanopowder may: 1. Photocatalytically degrade organic pollutants; 2. Catalyze the organic and inorganic synthesis; 3. Be applied for water splitting to produce hydrogen and separate out oxygen; 4. Be applied in photocatalytic reduction of metal ions, such as heavy metal chromium, mercury, lead, and so on; 5. Be used in photocatalytic degradation of organic pollutants, such as formaldehyde.…

Nano tungsten trioxide powder may be prepared by liquid phase ion exchange method and be used as a photocatalyst. It has excellent photocatalytic degradation performance. Liquid Phase Ion Exchange Method to Produce Fully Tungsten-based Z-type Orthorhombic Hydrated Tungsten Trioxide/Tetragonal Lead Tungstate Composite Photocatalyst Liquid phase ion exchange method was used to produce fully tungsten-based Z-type orthorhombic hydrated tungsten trioxide/tetragonal lead tungstate (WO3?0.33H2O/PbWO4) composite photocatalyst. The study found: 1. Determine the crystal phase and composition of the composite photocatalyst by XRD…

WO3 nanopowder may be prepared by a room temperature liquid phase method and used as a photocatalyst, which can play a role of catalysis under photon excitation, and does not participate in the reaction itself. Room Temperature Liquid Phase Method to Produce Interstitial C-doped Orthorhombic Phase Hydrated Tungsten Trioxide Photocatalyst Room temperature liquid phase method was applied to prepare the interstitial C-doped orthorhombic phase hydrated tungsten trioxide (C-doped WO3?0.33H2O) photocatalyst. As studies show: 1. The doping position of C is…

Tungsten trioxide nanopowder may be applied in the field of photocatalysis. Photocatalytic technology is a technology that can effectively remove highly toxic, low concentrated and unmanageable pollutants by only using solar energy without causing bad effects. Solvothermal Method to Produce Orthorhombic Phase Hydrated Tungsten Trioxide Photocatalyst With Flower-like Hierarchical Structure The solvothermal method was used to prepare orthorhombic phase hydrated tungsten trioxide (oWO3?0.33H2O) photocatalyst with flower-like hierarchical structure by adjusting the amount of acetone. Researches show that: 1. Acetone retained…

Nanometer tungsten trioxide powder may be prepared by solvothermal method and used as a photocatalyst. As one of the earliest studied photocatalysts, tungsten trioxide is environmentally friendly with excellent photostability so that it has broad application prospects in the fields of photocatalytic water splitting, photoelectrochemical cells and pollutant removal. Solvothermal Method to Produce Cubic Phase Hydrated Tungsten Trioxide Photocatalyst The solvothermal method was used to prepare cubic phase hydrated tungsten trioxide (cWO3?0.5H2O) photocatalyst with grain size of 120nm~180nm. The study…

High purity tungsten trioxide nanopowder may be used as a photocatalyst. Hydrothermal Method to Produce Hexagonal Phase Tungsten Trioxide Ultrathin Nanosheet Photocatalyst The hydrothermal method was used to prepare hexagonal phase tungsten trioxide (h-WO3) ultrathin nanosheet photocatalyst. And the role of urea played in the growth process of WO3 was studied. The thickness of the synthesized ultrathin nanosheet is about 5 nm. In the reaction, the hydrolysis of urea plays an irreplaceable role. On the one hand, it slows the…