In situ adsorption-catalysis system for the removal of o-xylene over anactivated carbon supported Pd catalyst
HUANG Shaoyong , ZHANG Changbin , HE Hong
DOI:
Received May 28, 2008,Revised August 21, 2009, Accepted , Available online
Volume 21,2009,Pages 985-990
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An activated carbon (AC) supported Pd catalyst was used to develop a highly e cient in situ adsorption-catalysis system for the
removal of low concentrations of o-xylene. In this study, three kinds of Pd/AC catalysts were prepared and tested to investigate the
synergistic e ciency between adsorption and catalysis for o-xylene removal. The Pd/AC catalyst was first used as an adsorbent to
concentrate dilute o-xylene at low temperature. After saturated adsorption, the adsorbed o-xylene was oxidized to CO2 and H2O by
raising the temperature of the catalyst bed. The results showed that more than 99% of the adsorbed o-xylene was completely oxidized to
CO2 over a 5% Pd/AC catalyst at 140°C. Brunauer-Emmett-Teller (BET) analysis, scanning electron microscopy (SEM), temperatureprogrammed
desorption (TPD), and temperature-programmed oxidation (TPO) were applied to investigate the physical properties
of o-xylene adsorption-desorption and the in situ adsorption-catalysis activity of the AC support and Pd/AC catalyst. A synergistic
relationship between the AC support and the active Pd species for the removal of low concentrations of o-xylene was established.
