Exploration on Mesoporous Tungsten Trioxide Electrocatalytic Property

Spray drying method is a systematic method of drying technology that is used in material. After the thinner is atomized in the drying chamber, contacted with hot air, the moisture rapidly vaporized by mechanical action, dispersing them into very fine mist as the same particles (increasing the water evaporation area accelerate the drying process) .and making them contacted with hot air, we can find most of the water is removed in an instant, the material of the solid material dried to a powder. The method can directly make a solution, emulsion dried into powdery or granular products, which can be omitted and evaporated. Spray drying has a fast drying process that can be directly dried into a powder, it is easy to change dry conditions, and it avoids flying dust in the workshop; it can improve product purity, it has high production efficiency.

The preparation of hollow mesoporous tungsten trioxide microspheres (HMTTS) is based on spray drying and calcination, a further load on the surface of the active ingredient of palladium (Pd), which can obtain nano Pd / HMTTS composite catalyst. The morphology and crystal structure of the catalysts are characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), etc. The result shows that, Pd nanoparticles are face-centered cubic crystal structure, evenly distributed in HMTTS surface. We Study Pd, HMTTS electrical properties of catalytic oxidation catalyst in formic acid solution using cyclic voltammetry and chronoamperometry, the results show Pd / HMTTS catalyst is higher than conventional tungsten trioxide palladium catalyst (Pd / WO₃) of formic acid exhibits in electro-catalytic activity. It is beneficial for formic acid oxidation process occurs in the surface of the palladium because of HMTTS unique structure and surface properties and hydrogen spillover effect hollow mesoporous.

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