Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation
Patent
1993-10-27
1995-10-10
Pol, Asok
Hazardous or toxic waste destruction or containment
Containment
Solidification, vitrification, or cementation
502 66, 502 79, 423259, 423659, 4232391, 423240R, 588206, A62D 300, C01B 707
Patent
active
054572681
ABSTRACT:
The invention relates to a process and a catalyst composition for the destruction of volatile organic compounds (VOCs). The process includes the step of contacting the VOCs with an oxygen-containing gas in the presence of a catalyst which is a metal-exchanged, metal-impregnated aluminosilicate zeolite with at least one exchanged metal in the zeolite being selected from the group consisting of Ti, V, Cr, Co, Ni, Cu, Fe, Mo, Mn, Pd, and Pt, and at least one impregnated metal in the zeolite being selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Mo, Pd and Pt, and wherein the difference between the exchanged metal and the impregnated metal varies the temperature necessary to promote oxidation of the compounds and for a contact time sufficient to oxidize the compounds. The process reaction temperature can vary from about 100.degree. C. to about 650.degree. C. and the contact time can vary from about 0.01 to 20 seconds. Preferredly, the reaction temperature is from about 150.degree. C. to about 450.degree. C. and the contact time is from about 0.1 to 1.0 seconds. The CO/CO.sub.2 ratio and the Cl.sub.2 /HCl ratio in the gaseous effluent can be varied through selection of at least two impregnating metals with at least one exchanged metal in the aluminosilicate zeolite or by the use of at least one impregnating metal with at least two exchanged metals in the aluminosilicate zeolite.
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Chatterjee Sougato
Greene Howard L.
Ramachandran Balachandran
Pol Asok
The University of Akron
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