铈铬比例对CeO2-CrOx复合氧化物催化剂上1,2-二氯乙烷催化氧化性能的影响

doi:10.3866/PKU.WHXB201212072

Abstract

Abstract:

CeO₂, Cr2O₃, and CeO₂-CrO_x mixed oxides with molar ratios of Ce to Cr of 9/1, 4/1, 2/1, 1/1, 1/2, 1/4, and 1/8 were prepared by coprecipitation. The catalytic performance of 1,2-dichloroethane (DCE) decomposition was evaluated on all the catalysts. The results indicate that CeO₂-CrO_x mixed oxides with different Ce/Cr molar ratios showed higher performance for the removal of DCE compared with pure CeO₂. The CeO₂-CrO_x mixed oxide with Ce/Cr molar ratio of 2/1 exhibited the highest catalytic activity of the samples, generating only small amounts of chlorinated by-products during the decomposition of DCE. The selectivity for HCl decreased as the molar ratio of Ce to Cr decreased. The catalysts were characterized by N₂ adsorption/desorption, X-ray diffraction (XRD), UV-Raman spectroscopy, hydrogen temperatureprogrammed reduction (H₂-TPR), and ammonia temperature-programmed desorption (NH₃-TPD) to study the effect of the Ce/Cr molar ratio on the physicochemical performance of the catalysts. An appropriate molar ratio of Ce to Cr formed a more stable Ce-Cr-O solid solution, which increased the mobility of reactive oxygen species, oxidative ability, surface acid content and the ratio of strong acidity, promoting the adsorption, activation and deep oxidation of DCE.

Key words: Catalytic oxidation, Chlorinated volatile organic compound, 1,2-Dichloroethane, CeO₂-CrO_x mixed oxide, Ce/Cr ratio

MENG Zhong-Hua, YANG Peng, ZHOU Ren-Xian. Influence of Ce/Cr Ratio on ₂-CrO_x Mixed Oxide Catalysts for the Catalytic Oxidation of 1,2-Dichloroethane[J].Acta Phys. -Chim. Sin., 2013, 29(02): 391-396.

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Influence of Ce/Cr Ratio on ₂-CrO_x Mixed Oxide Catalysts for the Catalytic Oxidation of 1,2-Dichloroethane

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Influence of Ce/Cr Ratio on ₂-CrO_x Mixed Oxide Catalysts for the Catalytic Oxidation of 1,2-Dichloroethane