Catalytic Oxidation of Chlorobenzene over MnO _x /Al₂O₃-carbon Nanotubes Composites

Abstract

MnO _x /Al₂O₃-carbon nanotubes (CNTs) composites prepared by hydrothermal method were characterized by XRD, SEM, TEM, TGA, BET, XPS and H₂-TPR. Catalytic oxidation of chlorobenzene (CB) was conducted over the composites under gas hourly space velocity (GHSV) of 36000 h⁻¹ and CB concentration of 2800 ppmv. For the catalyst with approximately 25 wt% CNTs and 10 at.% Mn, CB removal efficiencies reached up to 83.3 and 97.7% at 150 and 300 °C, respectively. Moreover, no Cl species was detected over the used MnO _x /Al₂O₃-CNTs catalyst implying that the release of chlorine element from the catalyst surface was facilitated by CNTs introduction.

Graphical Abstract

MnOx/Al₂O₃-carbon nanotubes (CNTs) composites were prepared by hydrothermal method. Catalytic oxidation of chlorobenzene (CB) was conducted over the composites in a continuous fixed bed flow reactor. CB removal efficiencies at different temperatures were obtained over various catalysts with different CNTs concentrations under a gas space velocity of 36000 h⁻¹ and CB concentration of 2800 ppmv. For the catalyst Mn/Al-C-2 with approximately 25 wt% CNTs and 10 at.% Mn, CB removal efficiencies of 83.3% at 150 °C and 97.7% at 300 °C were obtained. Our results suggest that the introduction of CNTs could significantly promote the catalytic oxidation of CB in low temperature region.