Catalytic combustion of chlorinated VOCs over VOx/TiO2 catalysts

VOx/TiO2 catalysts were prepared by wetness of TiO2 with anatase and rutile structures and tested in the catalytic combustion of CB, DCB, DCM and TCE. The characterization by XRD, TPR and XPS shows that VOx catalyst supported on anatase (VOx/TiO2-SG) possesses more V5+–O–V5+ and hence higher mobility of oxygen than VOx catalyst supported on rutile (VOx/TiO2-HY). VOx/TiO2-SG presents lower T50 and T90 for CVOC. High activity of VOx/TiO2-SG is related to high mobility of oxygen which weakens the adsorption of Cl species, and enhances the removal of Cl species from the surface of catalysts.

The stability tests for CB, DCB, TCE and DCM catalytic combustion over VOx/TiO2-SG catalyst at 250 °C for 20 h; reaction gas composition: 1000 ppm reactant, 10% O2, N2 balance; GHSV = 15,000 h− 1.Figure optionsDownload as PowerPoint slideHighlights
► VOx supported on anatase possesses more V5+-O-V5+ and higher mobility of oxygen.
► High mobility of oxygen can weaken the adsorption of Cl species.
► Stable high activity for CVOC combustion was found on anatase supported VOx.