用于碳烟燃烧的Cu0.05Ce0.95O催化剂活性氧物种的研究——等离子体的强化效应

摘要

The plasma effect of Cu0.05Ceo.95-CA catalyst on surface structure and species was characterized by TPO, H2-TPR, O2-TPD, XRD, BET and XPS. The results showed that the catalytic soot combustion activity is enhanced in plasma region. It displayed the best catalytic activity by 9kV voltage. The ignition temperature is 243.1℃ and the maximum oxidation temperature is 302.8℃, decreased by 65.1℃ and 92.7℃ by no plasma. Larger specific surface area and smaller crystallite size of Cu0.05Ce0.95-CA catalyst is emerged by plasma. With the help of plasma, the dispersion of CuO is increased. Meanwhile more Cu2+ enter into the lattice of CeO2 and more mixed oxides Cuy2+Ce1-y4+O2-y2-y are formed on the surface of Cu0.05Ce0.95-CA catalyst. More reactive oxygen species were formed and its fluxion, movement and transmission can promote the growth of oxygen vacancies circularly, which can promote the catalytic soot combustion activity persistently.%研究等离子体对柠檬酸络合法制备的Cu0.05Ce0.95-CA催化剂表面结构和物种的强化效应.TPO、H2-TPR、O2-TPD、XRD、BET和XPS等测试结果表明,催化剂处于等离子放电区时,其氧化碳烟燃烧的活性显著增强.在介质阻挡放电电压为9kV时,起燃温度为243.1℃,比无等离子的情况降低了65.1℃；燃烧峰值温度为302.8℃,降低92.7℃.在等离子体存在下,Cu0.05Ce0.95-CA催化剂有着更大的比表面积和更小的晶粒粒径；等离子体可以提高催化剂表面游离态的CuO的分散度,并使得更多的Cu2+进入CeO2晶格,形成更多的Cuy2+Ce1-y4+O2y2-y固熔体,催化剂储氧容量增大,在催化剂表面生成更多的活性氧物种,其流动、迁移和转化促进催化剂产生更多的氧空穴,如此循环,持续促进碳烟催化燃烧.