Ozone activated Ag/CeO2 catalysts for soot combustion: The surface and structural influences

Ozone activated Ag/CeO2 catalysts for soot combustion: The surface and structural influences
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用于烟灰燃烧的臭氧活化 Ag/CeO2 催化剂:表面和结构影响

DOI:
10.1016/j.cej.2019.121961
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发表时间:
2019-11
影响因子:
15.1
通讯作者:
Liu Shuang
Liu Shuang
中科院分区:
工程技术1区
文献类型:
--
作者:
Zhang Meisheng;Jin Baofang;Liu Yan;Liu Wei;Weng Duan;Wu Xiaodong;Liu Shuang

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在这项工作中,O3活化进行了在200 °C的两种类型的Ag/CeO 2催化剂与纳米立方体和纳米棒状形貌,分别。O3诱导的表面氧化物(“氧化物注入”)暂时加速了两种催化剂上的碳烟燃烧。相反,臭氧化引起的CeO 2表面氧空位(Ce 3 +-VO-s)的耗尽赋予长期活化。具体而言,具有低初始Ce 3+含量的臭氧化纳米立方体Ag/CeO 2不仅从“Ox−注入”中受益更多,而且表现出良好的氧化还原稳定性和较高的实用潜力。因此,该催化剂与O3活化的组合可导致车辆的颗粒过滤器中的有效烟灰消除。
In this work, O3activation was performed at 200 °C over two types of Ag/CeO2catalysts with nanocube- and nanorod-like morphologies, respectively. The O3-indcued surface Ox−species (“Ox−injection”) accelerated soot combustion over both catalysts temporarily. In contrast, the depletion of CeO2surface oxygen vacancies (Ce3+-VO-s) caused by ozonization conferred to long-term activation. Specifically, the ozonized nanocubic Ag/CeO2with low initial Ce3+content not only benefited more from the “Ox−injection”, but also exhibited good redox stability and high practical potential. Therefore, the combination of this catalyst with O3activation may result in efficient soot elimination in the particulate filters of vehicles.
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