STUDY OF A METHOD OF PREPARING A PLATE-TYPE CATALYST BY ANODIC-OXIDATION AND HOT-WATER TREATMENT

A thin-layered catalyst supported on a thermo-conductive metal plate is one of the ideal types of catalysts which make it possible to design a compact reactor. A reactor equipped with this type of catalyst can serve as a heat exchanger since the catalyst is expected to exhibit high thermal conductivity and low pressure loss. A Pt/Al2O3/Al-plate type catalyst was prepared by anodic oxidation of a commercial aluminum plate (to produce alumina film as a catalyst support), followed by hot-water treatment in chloroplatinic acid solution (to increase BET surface area of the alumina film and simultaneously to impregnate Pt as a catalyst species). The conditions for preparing a catalyst film of any thickness under 30 mum was established. The amount of Pt supported per BET surface area of alumina was 170-180 mug/m2, which corresponds to 3 wt% of alumina, and the dispersion of Pt was around 0.5, regardless of the thickness of the alumina film. Catalyst with 30 mum of alumina film showed a constant reaction rate per apparent surface area of 3.5 mol/(h.m2) for cyclohexane dehydrogenation at C6H12/N2=1/10, 1 atm and 200-degrees-C for 130 hours.