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        Large-scale synthesis of functional tungsten oxide with controlled oxygen-deficiency by a continuous screw reactor

        Eri Kumai,Fuyumi Shimono,Manabu Tanaka,Takayuki Watanabe,Takeshi Hoshino,Satoshi Hosoda,Hiroshi Kanamori,Yuji Fujita 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-

        Oxygen-deficient tungsten oxide is one of the promising materials for broad applications due to itsenhanced characteristics owing to the oxygen-deficiency. Development of a mass production process iscrucial in consideration of the increasing demand of this material in industrial purposes. A continuousscrew reactor was employed to the production of oxygen-deficient tungsten oxide. The effects of hydrogenconcentration and the reduction time on the composition of products were investigated. The maximumWO2.72 mole fraction of 0.95 was achieved by optimum hydrogen concentration and reductiontime. X-ray Photoelectron Spectroscopy (XPS) spectra of the products indicated the introduction ofoxygen-deficiency. Anisotropic crystal growth in the (010) direction is found in the cross-section observationby Scanning Electron Microscope (SEM). The displacing value from High-Resolution TransmissionElectron Microscope (HR-TEM) demonstrated the existence of WO2.72. The reaction kinetic was investigatedby thermogravimetric analysis. Estimated activation energy supported the results from the continuousprocess. This work suggests the promising process for the large-scale production of functionalmaterials.

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