物理化学学报Issue(2)：391-396,6.DOI:10.3866/PKU.WHXB201212072
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
Influence of Ce/Cr Ratio on CeO2-CrOx Mixed Oxide Catalysts for the Catalytic Oxidation of 1,2-Dichloroethane
摘要
Abstract
CeO2, Cr2O3, and CeO2-CrOx 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 al the catalysts. The results indicate that CeO2-CrOx mixed oxides with different Ce/Cr molar ratios showed higher performance for the removal of DCE compared with pure CeO2. The CeO2-CrOx mixed oxide with Ce/Cr molar ratio of 2/1 exhibited the highest catalytic activity of the samples, generating only smal 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 temperature-programmed 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.关键词
催化氧化/含氯挥发性有机物/1,2-二氯乙烷/CeO2-CrOx复合氧化物/铈铬比例中图分类号：O643Key words
Catalytic oxidation/Chlorinated volatile organic compound/1,2-Dichloroethane/CeO2-CrOx mixed oxide/Ce/Cr ratio引用本文复制引用
孟中华,杨鹏,周仁贤..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[J].物理化学学报,2013,(2):391-396,6.基金项目
The project was supported by the National Natural Science Foundation of China (21177110), Ministry of Science and Technology of China (2011AA03A406), and Program for Zhejiang Leading Team of Science and Technology Innovation, China.@@@@国家自然科学基金(21177110),国家863重大科研项目(2011AA03A406)和浙江省重点科技创新团队计划资助项目资助 （21177110）
