Article (Special Issue on Celebrating the 40th Anniversary of Institute of Catalysis, Zhejiang University)Elimination of 1,2-Dichloroethane (cas 107-06-2) over (Ce, Cr)xO2/Nb2O5 catalysts: synergistic performance between oxidizing ability and acidity

Add time:08/19/2019    Source:sciencedirect.com

A series of (Ce, Cr)xO2/Nb2O5 catalysts with different (Ce, Cr)xO2 to Nb2O5 mass ratios were synthesized by the deposition-precipitation method for use in deep catalytic oxidation of 1,2-Dichloroethane (cas 107-06-2) (DCE), which is one of the typical chlorinated volatile organic compound pollutants. The textural properties were characterized by X-ray diffraction, N2 adsorption/desorption isotherms, UV-Raman spectroscopy, and scanning electron microscopy. The surface acidity and the redox properties were characterized by ammonia temperature-programmed desorption and H2 temperature-programmed reduction, respectively. The results show that the addition of a proper amount of (Ce, Cr)xO2 over Nb2O5 significantly improves the intrinsic catalytic activity towards the deep oxidation of DCE, and only a very small amount of C2H3Cl is detected as the byproduct of the oxidation process. Further study reveals the existence of an obvious synergistic effect between Nb2O5, with abundant strong acid sites, and (Ce, Cr)xO2, with strong oxidation sites, as the strong acid sites of Nb2O5 promote the adsorption and dehydrochlorination of DCE, while the strong oxidation sites of (Ce, Cr)xO2 contribute to the deep oxidation of the reactant, intermediates, and byproducts.

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