Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 7, Issue 10, Pages 2129-2139Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cy00450h
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Funding
- Ministry of Science and Technology of China [2015AA034603]
- Fundamental Research Funds for the Central Universities
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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.
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