中文摘要：

采用共沉淀法制备了不同铈铬比例的CeO2-CrOx复合氧化物（Ce／Cr摩尔比分别为9／1、4／1、2／1、1／1、1／2、1，4、1，8）以及单纯的CeO2和Cr2O3，并研究了各催化剂对1，2-二氯乙烷（DCE）的催化氧化性能．结果表明，相较于单纯的CeO2，不同铈铬比例的复合氧化物催化剂对DCE的催化氧化活性有明显提高。其中Ce／Cr摩尔比为2／1的CeO2-CrOx复合氧化物上DCE的氧化活性最好。且只有极微量的含氯等副产物产生：随着Ce／Cr摩尔比减小，对HCl的选择性有下降的趋势．通过X射线衍射（XRD）、N2吸附／脱附（BET）、紫外拉曼（UV-Raman）光谱、H2程序升温还原（H2-TPR）、NH3程序升温脱附（NH3-TPD）等实验技术，研究了铈铬比例对铈铬复合氧化物的物理化学性质的影响．结果表明，适当比例Ce-Cr的复合，形成了结构较稳定的Ce—Cr-O固溶体，提高了催化剂活性氧物种的流动性，催化剂表面酸量及强弱酸比例，从而有利于DCE的吸附活化，进一步脱氯降解以及深度氧化．

英文摘要：

CeO2, Cr=O3, and CeO2-CrO, 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, 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 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 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.