Hydrogen oxidation reaction tungsten-based catalysts

Method (a) uses nitric acid for the oxidation of the mixture of cyclohexanol/cyclohexanon available by the hydrogenation of phenol process (b) is based on hydroxycarbonylation of 1,3-butadien and process (c) on a catalytic green chemistry reaction with water as the only side product. In this process, cyclohexene is oxidized hy hydrogen peroxide in the presence of tungsten-hased catalyst under phase-transfer catalysis (PTC). 

These reactions take place normally in a trickle bed downflow reactor at high hydrogen pressures (1500 to 4000 psi) and temperatures in excess of 600°F. The catalyst is frequently referred to as dual function since it promotes both cracking and hydrogenation. The catalyst base material is usually silica-alumina with metal oxides from groups VI and VIII (nickel, cobalt, molybdenum, tungsten). The active forms are the metal sulfides. Fractionation provides the waxy lubes cuts which are subsequently dewaxed and hydrofinished. 

---