TiO2에 담지된 금속 산화물 촉매상에서 TCE 산화분해반응

Abstract

Oxidative TCE decomposition over <TEX>$TiO_2$</TEX>-supported single and complex metal oxide catalysts has been conducted using a continuous flow type fixed-bed reactor system. Different types of commercial <TEX>$TiO_2$</TEX> were used for obtaining the supported catalysts via an incipient wetness technique. Among a variety of titanias and metal oxides used, a DT51D <TEX>$TiO_2\;and\;CrO_x$</TEX> would be the respective promising support and active ingredient for the oxidative TCE decomposition. The <TEX>$TiO_2-based\;CrO_x$</TEX> catalyst gave a significant dependence of the catalytic activity in TCE oxidation reaction on the metal loadings. The use of high <TEX>$CrO_x$</TEX> contents for preparing <TEX>$CrO_x/TiO_2$</TEX> catalysts might produce <TEX>$Cr_2O_3$</TEX> crystallites on the surface of <TEX>$TiO_2$</TEX>, thereby decreasing catalytic performance in the oxidative decomposition at low reaction temperatures. Supported <TEX>$CrO_x$</TEX>-based bimetallic oxide systems offered a very useful approach to lower the <TEX>$CrO_x$</TEX> amounts without any loss in their catalytic activity for the catalytic TCE oxidation and to minimize the formation of Cl-containing organic products in the course of the catalytic reaction.