Platinum-Doped Tungsten Trioxide Effect on Methanol

Platinum (Pt) is a shiny silver-white metal, its melting point is 1772 ℃, and the boiling point of 3827 ± 100 ℃, the density is 21.45 g / cm ³ (20 ℃), it is relatively soft. Platinum is full of good ductility, thermal and electrical conductivity. Platinum reference material (such as platinum sponge), a large surface area for gas (especially hydrogen, oxygen and carbon monoxide) have strong absorption capacity. Platinum due to its high chemical stability and catalytic activity, commonly used in the chemical industry as a catalyst, such as platinum hydrogenation, dehydrogenation, isomerization, cyclization, dehydration, dehalogenation, oxidation, pyrolysis and other chemical reactions .

The architecture of Methanol (CH₄O) is the most simple saturated alcohols , its molecular is 32.04, the boiling point is 64.7 ℃. It is called as "wood alcohol" because it is discovered in carbonized Methanol with alcohol is colorless volatile liquid. Methanol is used as organic extractant and alcohol denaturation agent in the manufacture of formaldehyde and pesticides.

The preparing of hollow branch structure of tungsten trioxide vector (d-WO₃) is made from hydrothermal method and sacrifice templates. A further load on its surface is active ingredient Pt; we can obtain nanometer Pt / d-WO₃ composite catalyst. X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and specific surface area and pore structure analysis (BET), etc. The morphology and structure of the catalysts were characterized. The results show that the tungsten trioxide having a length and a width of 6μm 2μm hollow dendritic structure of pore, and the size of distribution mainly is in 20 ~ 120 nm, a specific surface area of 24 m² / g, an average particle diameter of 7.2 nm. The nanoparticles uniformly distributes thereon surface. The study of the Pt / dWO₃ catalyst in the acidic solution electro-catalytic oxidation of methanol is used by cyclic voltammetry and chronoamperometry. The results shows, Pt / d- WO₃ catalyst ratio Pt / C and Pt / WO₃ catalyst for methanol have a higher electro-catalytic oxidation activity and stability. Hollow mesoporous structure has the d-WO₃ and bifunctional mechanism of action in favor of direct dehydrogenation of methanol oxidation process at the platinum surface.

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