Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 79, Issue 1-2, Pages 43-52Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2007.09.034
Keywords
PCE destruction; catalytic dechlorination; redox conditions; reduction; oxidation
Funding
- NIEHS NIH HHS [P42 ES004940-200027, P42 ES004940-160027, P42 ES004940, P42 ES004940-180027, P42 ES004940-170027] Funding Source: Medline
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The validity of a new method to destroy gas-phase perchloroethylene (PCE) is demonstrated at bench scale using a fixed-bed reactor that contains a Pt/Rh catalyst. Hydrogen and oxygen were simultaneously fed to the reactor together with PCE. The conversion efficiencies of PCE were sensitive to H-2/O-2 ratio and reactor temperature. When the temperature was >= 400 degrees C and H-2/O-2 was >= 2.15, PCE conversion efficiency was maintained at >= 90%. No catalyst deactivation was observed for over 2 years, using only mild, convenient regeneration procedures. It is likely that PCE reduction steps precede oxidation reactions and that the importance of oxidation lies in its elimination of intermediates that would otherwise lead to catalyst poisoning. In practice, this catalytic dechlorination method holds potential for low-cost, large-scale field operation. (C) 2007 Elsevier B.V. All rights reserved.
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