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DEVELOPMENT OF TRANSITION METAL OXIDE-ZEOLITE CATALYSTS TO CONTROL CHLORINATED VOC AIR EMISSIONS
Citation:
Vogel, C. AND H. Greene. DEVELOPMENT OF TRANSITION METAL OXIDE-ZEOLITE CATALYSTS TO CONTROL CHLORINATED VOC AIR EMISSIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/029 (NTIS PB94155330), 1993.
Description:
The paper discusses the development of transition metal oxide (TMO)-zeolite oxidation catalysts to control chlorinated volatile organic compound (CVOC) air emissions. esearch has been initiated to enhance the utility of these catalysts by the development of a sorption-catalyst system. eolites with a high Al/Si ratio (e.g., Y-zeolite) provide active acid exchange sites. he exchanged and calcined zeolite is impregnated with the same or different metal and calcined to form the TMO film. hese TMC-zeolites provide shape selectivity and three types of active sites: unexchanged HY (Bronsted) acid active sites, highly active exchanged sites, and impregnated TMO sites. hey can achieve over 95% destruction efficiency at relatively low temperatures (i.e., 300 to 350 C) of a humid, low concentration CVCC, and are very resistive to poisoning. n the sorption-catalyst system, the zeolite first would physically adsorb the CVCC at room temperature. he system would then be heated to promote the TMO-zeolite catalytic reaction. he Y-zeolites can physically adsorb about 5% VOC but are highly hydrophilic. ilicalite is a zeolite with very little Al, can adsorb up to 15% VOC, and is hydrophobic. mpregnated Silicalite is an effective adsorbent and fair catalyst.
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DEVELOPMENT OF TRANSITION METAL OXIDE-ZEOLITE CATALYSTS TO CONTROL CHLORINATED VOC AIR EMISSIONS