Low-Temperature Catalytic Combustion of Chlorobenzene Over CeOx-VOx/TiO2-Graphene Oxide Catalysts.

CeOx-VOx/TiO2 catalysts (Ce-V/Ti) incorporating graphene oxide (GO) were synthesized via a sol–gel method and used for catalytic combustion of chlorobenzene (CB). Compared with Ce-V/Ti, GO supported catalysts (Ce-V/Ti-GO) presented more excellent performance. Characterization by XRD, TEM, BET, XPS, FTIR and H2-TPR revealed that the specific surface area of catalyst and the concentrations of surface Ce3+ and V4+ were enlarged after GO modification. However, introducing too much GO did not be conductive to promote catalyst activity. With the GO ratio increasing to 1.5%, Ce from catalyst was prone to form a separate crystal CeO2 with large size, resulting in a decline in specific surface area and uneven dispersion of active components. Ce-V/Ti-GO with 0.7% GO support showed high activity with the temperature for a 90% CB conversion (T90) of 236 °C. The main phase from Ce-V/Ti-GO(0.7) was anatase and evident lattice distortion resulted from Ce–O–Ti solid solution was observed. In the case of Ce-V/Ti-GO catalysts, V effectively promoted the activity of catalysts and the stability with the variation of GO ratio. The synergy between Ce and GO played the critical role on the low-temperature performance of catalysts. [ABSTRACT FROM AUTHOR]