Transient behavior and reaction mechanism of CO catalytic ignition over a CuO–CeO2 mixed oxide
文献类型：期刊论文
| 作者 | 康润宁;Ma PD; He JY; Li HX(李慧鑫); Bin F(宾峰) ; Wei XL(魏小林); Dou BJ; Kwun NH; Kwan SH; Kang RN(康润宁); Kang RN(康润宁)
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| 刊名 | Proceedings of the Combustion Institute
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| 出版日期 | 2020 |
| 卷号 | 38 |
| DOI | 10.1016/J.PROCI.2020.06.186 |
| 英文摘要 | This study focuses on the variation in activity-controlling factors during CO catalytic ignition over a CuO–CeO2 catalyst. The activity for CO combustion follows the decreasing order of CuO–CeO2 > CuO > CeO2. Except for inactive CeO2, increasing temperature induces CO ignition to achieve self-sustained combustion over CuO and CuO–CeO2. However, CuO provides enough copper sites to adsorb CO, and abundant active lattice oxygen, thus obtaining a higher hot zone temperature (208.3°C) than that of CuO–CeO2 (197.3 °C). Catalytic ignition triggers a kinetic transition from the low-rate steady-state regime to a high-rate steady-state regime. During the induction process, Raman, X-ray photoelectron spectroscopy (XPS), CO temperature-programmed desorption (CO-TPD) and infrared (IR) spectroscopy results suggested that CO is preferentially adsorbed on oxygen vacancies (Cu+-[Ov]-Ce3+) to yield Cu+-[CO]-Ce3+ complexes. Because of the self-poisoning of CO, the adsorbed CO and traces of adsorbed oxygen react at a relative rate, which is entirely governed by the kinetics on the CO-covered surface and the heat transport until the pre-ignition regime. Nonetheless, the Cu+-[CO]-Ce3+ complex is a major contributor to CO ignition. The step-response runs and kinetic models testified that after ignition, a kinetic phase transition occurs from a CO-covered surface to an active lattice oxygen-covered surface. During CO self-sustained combustion, the rapid gas diffusivity and mass transfer is beneficial for handling the low coverage of CO. The active lattice oxygen of CuO takes part in CO oxidation. |
| 分类号 | 一类 |
| 语种 | 英语 |
| 其他责任者 | Feng Bin(宾峰) |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/85698]  |
| 专题 | 力学研究所_高温气体动力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | 康润宁；Ma PD,He JY,Li HX,et al. Transient behavior and reaction mechanism of CO catalytic ignition over a CuO–CeO2 mixed oxide[J]. Proceedings of the Combustion Institute,2020,38. |
| APA | 康润宁；Ma PD.,He JY.,李慧鑫.,宾峰.,魏小林.,...&康润宁.(2020).Transient behavior and reaction mechanism of CO catalytic ignition over a CuO–CeO2 mixed oxide.Proceedings of the Combustion Institute,38. |
| MLA | 康润宁；Ma PD,et al."Transient behavior and reaction mechanism of CO catalytic ignition over a CuO–CeO2 mixed oxide".Proceedings of the Combustion Institute 38(2020). |
入库方式： OAI收割
来源：力学研究所
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