Elimination of 1,2-dichloroethane over (Ce,Cr)xO2/Nb2O5 catalysts: synergistic performance between oxidizing ability and acidity

doi:10.1016/S1872-2067(18)63203-6

Abstract

Abstract:

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 (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.

Key words: 1,2-dichloroethane, Deep oxidation, Mixed oxide, Nb₂O_5, Synergistic effect

Jie Wan, Peng Yang, Xiaolin Guo, Renxian Zhou. Elimination of 1,2-dichloroethane over (Ce,Cr)_xO₂/Nb₂O₅ catalysts: synergistic performance between oxidizing ability and acidity[J]. Chinese Journal of Catalysis, 2019, 40(7): 1100-1108.

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Elimination of 1,2-dichloroethane over (Ce,Cr)_xO₂/Nb₂O₅ catalysts: synergistic performance between oxidizing ability and acidity

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