Ag-incorporated macroporous CeO2 catalysts for soot oxidation: Effects of Ag amount on the generation of active oxygen species
DC Field | Value | Language |
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dc.contributor.author | Lee, Jae Hwan | - |
dc.contributor.author | Lee, Seong Ho | - |
dc.contributor.author | Choung, Jin Woo | - |
dc.contributor.author | Kim, Chang Hwan | - |
dc.contributor.author | Lee, Kwan-Young | - |
dc.date.accessioned | 2021-09-01T13:53:23Z | - |
dc.date.available | 2021-09-01T13:53:23Z | - |
dc.date.created | 2021-06-19 | - |
dc.date.issued | 2019-06-05 | - |
dc.identifier.issn | 0926-3373 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/64799 | - |
dc.description.abstract | A series of CeO2-based catalysts were investigated for soot oxidation with O-2. The macroporous CeO2 catalyst (MCeO2) showed higher soot oxidation activity than mesoporous CeO2 due to the enhanced contact between catalyst and soot caused by the large pore size of M-CeO2. Moreover, various amounts of Ag (2-20 wt.%) were introduced to M-CeO2 to increase the activity, and the Ag-incorporated macroporous CeO2 catalysts (Ag(x)_M-CeO2) were characterized. Raman spectra showed that the ratio of active oxygen species (O-x(n-)) were different according to amount of Ag. The ratio of highly reactive superoxide (O-2(-)) was largest for the Ag(5)_M-CeO2 catalyst, and then it was decreased as the Ag amount increased further. In addition, XPS analysis showed that the difference in O-x(n-) generation could be attributed to diverse surface oxygen vacancies in the catalysts. Hence, the amount of loaded Ag affected the surface oxygen vacancies of Ag(x)_M-CeO2 and consequently the ratio of O-x(n-) was different according to the surface oxygen vacancies of the catalysts. Ag(5)M-CeO2 with the appropriate surface oxygen vacancies induced the promotion of O-2(-) generation, resulting in the best soot oxidation activity. It was concluded that the amount of Ag on CeO2 has a great influence on the catalytic soot oxidation activity, and proper surface oxygen vacancies facilitated O-2(-) generation, whereas excessive surface oxygen vacancies hindered the formation of highly reactive O-x(n-). | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER SCIENCE BV | - |
dc.subject | COMPLEX OXIDE CATALYSTS | - |
dc.subject | CERIA-BASED CATALYSTS | - |
dc.subject | DIESEL SOOT | - |
dc.subject | AG/CEO2 CATALYSTS | - |
dc.subject | SURFACE | - |
dc.subject | COMBUSTION | - |
dc.subject | STABILITY | - |
dc.subject | SILVER | - |
dc.subject | CO | - |
dc.subject | NANOPARTICLES | - |
dc.title | Ag-incorporated macroporous CeO2 catalysts for soot oxidation: Effects of Ag amount on the generation of active oxygen species | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Lee, Seong Ho | - |
dc.contributor.affiliatedAuthor | Lee, Kwan-Young | - |
dc.identifier.doi | 10.1016/j.apcatb.2019.01.064 | - |
dc.identifier.scopusid | 2-s2.0-85061055659 | - |
dc.identifier.wosid | 000460495400037 | - |
dc.identifier.bibliographicCitation | APPLIED CATALYSIS B-ENVIRONMENTAL, v.246, pp.356 - 366 | - |
dc.relation.isPartOf | APPLIED CATALYSIS B-ENVIRONMENTAL | - |
dc.citation.title | APPLIED CATALYSIS B-ENVIRONMENTAL | - |
dc.citation.volume | 246 | - |
dc.citation.startPage | 356 | - |
dc.citation.endPage | 366 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Engineering, Chemical | - |
dc.subject.keywordPlus | COMPLEX OXIDE CATALYSTS | - |
dc.subject.keywordPlus | CERIA-BASED CATALYSTS | - |
dc.subject.keywordPlus | DIESEL SOOT | - |
dc.subject.keywordPlus | AG/CEO2 CATALYSTS | - |
dc.subject.keywordPlus | SURFACE | - |
dc.subject.keywordPlus | COMBUSTION | - |
dc.subject.keywordPlus | STABILITY | - |
dc.subject.keywordPlus | SILVER | - |
dc.subject.keywordPlus | CO | - |
dc.subject.keywordPlus | NANOPARTICLES | - |
dc.subject.keywordAuthor | Soot oxidation | - |
dc.subject.keywordAuthor | Macroporous structure | - |
dc.subject.keywordAuthor | Ag-loaded CeO2 | - |
dc.subject.keywordAuthor | Surface oxygen vacancies | - |
dc.subject.keywordAuthor | Active oxygen species | - |
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