Catalytic oxidation of vinyl chloride emissions over Co-Ce composite oxide catalysts
Catalytic oxidation of vinyl chloride emissions over Co-Ce composite oxide catalysts
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Co-Ce复合氧化物催化剂催化氧化氯乙烯排放
DOI：
10.1016/j.cej.2017.01.007
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发表时间：
2017-05
影响因子：
15.1
通讯作者：
Giroir-Fendler Anne
中科院分区：
文献类型：
--
作者：
Wang Chao;Guo Yanglong;Giroir-Fendler Anne
采用柠檬酸溶胶-凝胶法制备了不同摩尔比的Co-Ce复合氧化物催化剂，对空气中氯乙烯的催化氧化性能进行了评价，并将其作为工业废气中氯化VOCs减排的模型反应。采用XRD、n2吸附、Raman、H2-TPR、O2-TPD、NH3-TPD、XPS和HR-TEM等多种表征技术，考察了在15000 h−1的GHSV下，1000 ppm氯乙烯催化氧化的理化性质。铈在钴氧化物中的存在改变了Co-Ce复合氧化物催化剂的氧化还原性能和化学状态，增加了Co2+的存在、氧空位和氧迁移率。在Co-Ce复合氧化物催化剂中，Co/(Ce + Co)摩尔比为0.7的Co/(Ce + Co)复合氧化物催化剂对氯乙烯的氧化活性和稳定性最高，这与Co/(Ce + Co)的高反应活性和表面活性氧的进一步氧化所产生的协同效应有关。
A series of Co-Ce composite oxide catalysts with different molar ratio were prepared by the citrate sol-gel method and evaluated for the catalytic oxidation of vinyl chloride present in air, which was selected as a model reaction for chlorinated VOCs abatement from industrial exhaust. Numerous of characterization techniques including XRD, N2sorption, Raman, H2-TPR, O2-TPD, NH3-TPD, XPS and HR-TEM were used to evaluate the influence of the physicochemical properties on the catalytic oxidation of 1000 ppm of vinyl chloride at a GHSV of 15,000 h−1.The presence of cerium in the cobalt oxides modified the redox properties and the chemical states of the Co-Ce composite oxide catalysts, increasing the presence of Co2+species, the oxygen vacancies, and the oxygen mobility. Among the Co-Ce composite oxide catalysts, the one with a Co/(Ce + Co) molar ratio at 0.7 presented the highest catalytic activity and stability for the oxidation of vinyl chloride, which was related to the synergetic effect derived from the high reactivity on Co2+sites and its further oxidation by surface active oxygen species.
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