Citation: 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 Physico-Chimica Sinica, ;2013, 29(02): 391-396. doi: 10.3866/PKU.WHXB201212072 shu

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

1.
Department of Chemistry, Zhejiang University, Hangzhou 310028, P. R. China

Received Date: 15 October 2012
Available Online: 7 December 2012
Fund Project: 国家自然科学基金(21177110) (21177110) 国家863 重大科研项目(2011AA03A406) (2011AA03A406)

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.
- Catalytic oxidation,
- Chlorinated volatile organic compound,
- 1,2-Dichloroethane,
- CeO₂-CrO_x mixed oxide,
- Ce/Cr ratio
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

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通讯作者: 陈斌, bchen63@163.com

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