Abstract
CrOx/black-TiO2 catalysts were prepared by ligand-assisted (citric acid, oxalic acid and ethylenediaminetetraacetic acid) impregnation method. These catalysts were characterized in detail by means of X-ray diffraction, Raman, BET, X-ray photoelectron spectroscopy, H2 and O2(NO) temperature programmed reduction or desorption and in-suit DFTIR spectra. The results indicated that ligands assistance was beneficial for CrOx interacted with oxygen vacancies and O–Ti–O structures. Among all the catalysts, CrOx/black-TiO2/CA (modified by citric acid) revealed excellent catalytic activity and stability for NO oxidation in the temperature range of 200–450 °C. The characterization results exhibited that the interaction existed between CrOx and oxygen vacancies resulting in more Cr6+. Moreover, the strong interaction between CrOx and O–Ti–O was attributed to the modification of carboxylic acid, which increased the content of Cr3+ and chemical adsorption oxygen. High content of chemical adsorption oxygen promoted the adsorption ability of O2, and Cr6+ enhanced the adsorption capacity of NO. Hence, chemical adsorption oxygen and Cr6+ synergistically promoted the NO oxidation.
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