Activity and product distribution of alumina supported platinum and palladium catalysts in the gas-phase oxidative decomposition of chlorinated hydrocarbons
Jr. Gonzalez-velasco et al., Activity and product distribution of alumina supported platinum and palladium catalysts in the gas-phase oxidative decomposition of chlorinated hydrocarbons, APP CATAL B, 19(3-4), 1998, pp. 189-197
Citations number
36
Categorie Soggetti
Physical Chemistry/Chemical Physics","Environmental Engineering & Energy
The complete catalytic oxidation of 1,2-dichloroethane (DCE) and trichloroe
thylene (TCE) over alumina supported noble metal catalysts (Pt and Pd) was
evaluated. Experiments were performed at conditions of lean hydrocarbon con
centration (around 1000 ppm) in air, between 250 degrees C and 550 degrees
C in a conventional fixed bed reactor. The catalysts were prepared in a ran
ge of metal contents from 0.1 to 1 wt%. Palladium catalysts resulted to be
more active than platinum catalysts in the oxidation of both chlorinated vo
latile organic compounds. DCE was completely destructed at 375 degrees C, w
hereas TCE required 550 degrees C. HC1 was the only chlorine-containing pro
duct in the oxidation of DCE in the range of 250-400 degrees C. Tetrachloro
ethylene was observed as an intermediate in the oxidation of TCE, being; fo
rmed to a significant extent between 400 degrees C and 525 degrees C. CO wa
s also detected in the oxidation of both DCE and TCE over Pd catalysts, tho
ugh at temperatures of complete destruction, CO<INF>2</INF><SUP></SUP> was
the only carbon-containing product. The Pt catalysts were selective to CO<I
NF>2</INF> at the studied contionons. (C) 1998 Elsevier Science B.V. All ri
ghts reserved.