CATALYTIC-OXIDATION FOR AIR-POLLUTION CONTROL

Bench-scale experiments have been conducted to evaluate a series of ti tania-supported Pr-Pd (as oxides) catalysts in the presence and absenc e of MoO3 and Fr2O3 additives for their effectiveness in the complete catalytic oxidation of volatile organic compounds (VOCs) in air likely to be found in waste gases. Under oxidizing conditions, all of the ca talysts promoted the complete oxidation of VOCs to CO2 and H2O. 99 % C onversion was achieved with a C2H4-C2H6 gas mixture in air at temperat ures between about 160-450 degrees C and at a space velocity of 20,000 h(-1). Oxidation activity for the titania supported catalysts were fo und to decrease in the order Pt-Pd-Mo-Fe > Pt-Pd-Mo > Pt-Pd-Fe > Pr-Pd . However, the addition of MoO3 and Fe2O3 increase the catalyst activi ty and reduce the reaction temperature for the complete destruction. A geing was also performed in order to study the stability of the most a ctive catalyst. Pr-Pd-Mo-Fe (as oxides) on titania catalyst is effecti ve in oxidizing a wide range of volatile organic compounds al relative ly low temperatures (220-405 degrees C) and and at a space velocity of 40,000 h(-1) and is resistant to poisoning by halogenated and amine v olatile organic compounds.