An activated carbon （AC） supported Pd catalyst was used to develop a highly efficient in situ adsorption-catalysis system for the removal of low concentrations of o-xylene. In this study, three kinds of Pd/AC cataly...An activated carbon （AC） supported Pd catalyst was used to develop a highly efficient 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 efficiency 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 H20 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℃. 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.展开更多
PANI (polyaniline)/PP(polypropylene) conductive fibers with the conductivity value up to 0.12 S/cm were prepared with PP fibers as matrix via in-situ adsorption polymerization technique. The aniline monomer concentrat...PANI (polyaniline)/PP(polypropylene) conductive fibers with the conductivity value up to 0.12 S/cm were prepared with PP fibers as matrix via in-situ adsorption polymerization technique. The aniline monomer concentration, the oxidant concentration, the doping acid concentration and the reaction time have been found to strongly correlate with the result conductivity of the composite fibers. The optimized polymerization conditions were concluded as follow: 0.6 mol/L doping acid concentration, 0.02 g/ml oxidant concentration, 90% aniline monomer concentration and 120 min reaction time. In this process, the thickness of polyaniline sedimentation layer on the surface of PP fiber gradually increased with the increase of reaction period. The properties and morphology of the composite fibers are reported.展开更多
基金supported by the National Natural Science Foundation of China (No. 20607029)the Ministry of Science and Technology of China (No. 2007AA061402)
文摘An activated carbon （AC） supported Pd catalyst was used to develop a highly efficient 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 efficiency 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 H20 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℃. 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.
文摘PANI (polyaniline)/PP(polypropylene) conductive fibers with the conductivity value up to 0.12 S/cm were prepared with PP fibers as matrix via in-situ adsorption polymerization technique. The aniline monomer concentration, the oxidant concentration, the doping acid concentration and the reaction time have been found to strongly correlate with the result conductivity of the composite fibers. The optimized polymerization conditions were concluded as follow: 0.6 mol/L doping acid concentration, 0.02 g/ml oxidant concentration, 90% aniline monomer concentration and 120 min reaction time. In this process, the thickness of polyaniline sedimentation layer on the surface of PP fiber gradually increased with the increase of reaction period. The properties and morphology of the composite fibers are reported.
