Blue Tungsten Oxide Academic Research Anthology

'Structures and optical properties of tungsten oxide thin films deposited by magnetron sputtering of WO3 bulkEffects of annealing temperature' Tungsten oxide thin films were deposited on glass substrates by the magnetron sputtering of WO3 bulk at room temperature. The deposited films were annealed at different temperatures in air. The structural measurements indicate that the films annealed below 300℃ were amorphous, while the films annealed at 400℃ were mixed crystalline with hexagonal and triclinic phases of WO3. It was observed that the crystallization of the annealed films becomes more and more distinct with an increase in the anne...

'Reduction Process of Blue Tungsten Oxide and its Microcomputer Process Control' The grain size control of the tungsten powder is essential for high quality tungsten products making. Based on the studies onthe hydrogen reduction process of tungsten oxide, a microcomputer system is introduced to the reduction process parameters con-trol. The microcomputer process control system, which is now running in Zhuzhou Tungsten and Molybdenum Materials Plant,controls the process parameters including the temperature of the reduction furnace and the pressure of hydrogen.

'Effects of WOx modification on the activity, adsorption and redox properties of CeO2 catalyst for NOx reduction with ammonia' A series of WO3/CeO2 (WOx/CeO2) catalysts were synthesized by wet impregnation of ammonium metatungstate on a CeO2 support. The resulting solid acid catalysts were characterized by X-ray diffraction (XRD), UV-Vis spectroscopy (UV-Vis), Raman spectroscopy (Raman), in-situ Fourier transform infrared spectroscopy (in-situ FT-IR) of ammonia adsorption, NH3-TPD, H2 temperature-programmed reduction (H2-TPR), NH3/NO oxidation and activity measurements for NOx reduction by NH3 (NH3-SCR).

'Crystal growth of tungsten during hydrogen reduction of tungsten oxide at high temperature' Crystal growth of tungsten during hydrogen reduction of tungsten oxide (WO3) to prepare coarse grain tungsten powder at high temperature (950 ℃) was studied. The phase composition and morphologies of products were investigated by means of XRD and SEM. The results show that the reduction sequence of hydrogen reduction of WO3 is WO3→WO2.9→W18O49→WO2→W. The step of WO2→W is the critical step which determines the grain size of tungsten powder. The partial pressure (pH2O/pH2) of H2O within powder lay...