Catalytic Oxidation of Isopropyl Alcohol on Mixed Oxides Prepared by Impregnation

摘要

This study investigated the catalytic oxidation of isopropyl alcohol (IPA) over gravel covered by mixed metal oxides. Catalysts were prepared by incipient impregnation with metal weight loadings and various metal mole ratios. The most effective catalyst was selected based on the yield of carbon dioxide (CO_2), and the effect of the operational parameters (inlet IPA concentration, space velocity, and oxygen concentration) of catalytic oxidization on the yield of CO_2 was studied. Finally, the stability of the catalyst activity was observed, and confirmed by scanning electron microscopy (SEM), elemental analyzer (EA), and the Brunauer-Emmett-Teller equation (BET). Results demonstrate that 10 wt.% Cu_(0.6)Co_(0.4) catalyst was the most effective because the CO_2 yield reached 95% under the following operating conditions; a temperature of 350℃, an inlet IPA concentration of 1,500 ppm, an oxygen concentration of 21%, and a space velocity of 13,500 h~(-1). Given these operational parameters of the IPA oxidation experiments, the yield of CO_2 increased with the temperature and oxygen concentration, but decreased as the inlet IPA concentration and space velocity increased. Additionally, the stability test results indicated that the 10 wt.% Cu_(0.6)Co_(0.4) catalyst exhibited excellent stability at both low and high IPA conversion. This reaction is important from an environmental standpoint, because the copper/cobalt catalyst can reduce the reaction temperature of IPA and most of the IPA was removed catalytically. The result demonstrated that the conversion did not vary significantly with the IPA concentration.