Add time:07/31/2019         Source:sciencedirect.com

Nanostructure cerium–titanium catalysts including fluoride (F−) doped ones were prepared by impregnation (Ce/TiO2 and Ce/F–TiO2) and co-precipitation (CeTi and CeTiF) method, and tested as ozonation catalysts for low-temperature NOX removal ranging from 40 to 180 °C. Interestingly, the doping of F− promotes the NOX removal for CeTi whereas inhibits the removal for Ce/TiO2. The NOX removal presents linear relationship with the concentration of hydroxyl radicals (OH). The surface –OH linked to Ce atoms as well as the H2O adsorption over Ce atoms play the important role in the generation of ·OH radicals. The doping of F− into CeTi improves the activation of Ce–OH linkage bonds and the adsorption of H2O over Ce atoms, thus increasing the concentration of OH radicals and catalytic activities. Although the doping of F− into Ce/TiO2 enhances the density of surface –OH, the ones linked to Ce atoms remain constant and the H2O adsorption over Ce atoms are declined, finally declining the catalytic activities.

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