The effect of polyethylene glycol modification on CrOx/TiO2 catalysts for NO oxidation

CrO x was loaded on a different amount of polyethylene glycol modified TiO 2 (CrO x /yPEG-TiO 2 ) by impregnation method, successfully utilized in NO oxidation. The structure-property relationships of the catalysts were explored through different characterization techniques including XRD, BET, Raman, XPS, H 2 -TPR, O 2 -TPD, NO-TPD and in situ DRIFTS. The results pointed out that the polyethylene glycol modification could enhance the interaction between CrO x with TiO 2 . Among these CrO x /yPEG-TiO 2 (y = 0, 30, 50, 80) catalysts, the CrO x /50PEG-TiO 2 had the strongest interaction between CrO x with TiO 2 , which resulted in more chemical adsorption oxygen. Meanwhile, CrO x /50PEG-TiO 2 had a certain amount of Cr 6+ . It exhibited the highest catalytic activity due to the synergy between CrO x and chemical adsorption oxygen, which reached 55% at the temperature of 350 °C. Moreover, the CrO x /50PEG-TiO 2 still exhibited wide activity temperature windows of 225–425 °C and good stability.