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首页> 外文期刊>Catalysis science & technology >Activation and deactivation of Ag/CeO2 during soot oxidation: influences of interfacial ceria reduction
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Activation and deactivation of Ag/CeO2 during soot oxidation: influences of interfacial ceria reduction

机译：的激活和解除激活Ag / CeO2的烟尘氧化:界面二氧化铈的影响减少

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摘要

Different Ag/CeO2 catalysts with uniform structures and diverse surface oxygen vacancy (VO-s) contents were synthesized via a modified solution combustion method. Based on the results of Raman spectroscopy, H-2-TPR and isothermal soot oxidation, it was suggested that even with gaseous O-2 participating in the reaction, ceria surface sites around the catalyst-soot contact points can still be reduced by soot gradually. This interfacial reduction led to the generation of extra VO-s without changing the oxygen vacancies in the bulk of CeO2. Notably, this VO-s dynamic change and the insufficient O-2 (-) regeneration/delivery further resulted in the activation and deactivation of Ag/CeO2 during reaction with soot. This means that both the existence of ceria VO-s and its dynamic change during reaction may have a crucial influence on catalyst behavior. By further exploring these activity variations, the VO-s content, catalyst-soot contact condition and extra oxygen supplier were proved to be the three most important structural factors behind the soot oxidation activity of all the ceria-based catalysts. In this sense, Ag/CeO2 catalysts with appropriate morphology and moderate initial VO-s content may exhibit good activity for soot oxidation.
机译：不同的催化剂Ag / CeO2制服结构和不同表面氧空位通过修改(VO-s)内容是合成溶液燃烧法。拉曼光谱、H-2-TPR和等温过程烟尘氧化,甚至建议气体-参与反应,二氧化铈在catalyst-soot接触表面的网站点仍然可以逐渐减少了烟尘。这个界面减少导致了一代人额外的VO-s而不改变氧气在大部分CeO2空缺。动态变化和不足0 2 (-)进一步导致再生/交付的激活和解除激活期间Ag / CeO2的反应与烟尘。存在的二氧化铈VO-s及其动态变化反应过程中可能有至关重要的影响催化剂的行为。活动的变化,VO-s内容,catalyst-soot接触条件和额外的氧气供应商被证明是三个最重要的结构性因素烟尘所有的ceria-based氧化活动催化剂。适当的形态学和初始VO-s温和内容可能出现煤烟的好活动氧化。

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