DC Field | Value | Language |
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dc.contributor.author | Ahn, Nak Ho | - |
dc.contributor.author | Shin, Jiho | - |
dc.contributor.author | Ryu, Taekyung | - |
dc.contributor.author | Hong, Suk Bong | - |
dc.date.accessioned | 2019-04-07T15:52:14Z | - |
dc.date.available | 2019-04-07T15:52:14Z | - |
dc.date.created | 2019-01-16 | - |
dc.date.issued | 2018-12 | - |
dc.identifier.issn | 1932-7447 | - |
dc.identifier.uri | https://oasis.postech.ac.kr/handle/2014.oak/95464 | - |
dc.description.abstract | We have recently demonstrated that divalent copper ions exchanged into the large-pore zeolite UZM-35 with MSE topology (Cu-UZM-35) when hydrothermally aged at 750 degrees C exhibit a considerably wider operating temperature window for NH3-SCR than those into the small-pore zeolite SSZ-13 with CHA topology (Cu-SSZ-13), the current commercial catalyst for this reaction. Here we report the physical states and locations of copper ions in the fresh and 750 degrees C aged forms of Cu-UZM-35 determined using quantitative EPR measurements and synchrotron powder X-ray diffraction and Rietveld analyses. Among the four different cation sites (Cu1-Cu4) identified in fresh Cu-UZM-35, sites Cu3 and Cu4 are easily accessible via 12-ring and 10-ring channels, respectively, allowing their copper ions to serve as the main active sites for NH3-SCR. It was also found that while the Cu2+ ions at site Cu3 remain unchanged even after hydrothermal aging at 750 degrees C, the [Cu(OH)](+) ions at site Cu4 are transformed into CuOx and/or CuAl2O4 species. This led us to conclude that the Cu2+ ions at the former site are mainly responsible for the wide operating temperature window of Cu-UZM-35. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.relation.isPartOf | JOURNAL OF PHYSICAL CHEMISTRY C | - |
dc.title | Extraframework Cation Locations in Cu-UZM-35 NH3-SCR Catalyst | - |
dc.type | Article | - |
dc.identifier.doi | 10.1021/acs.jpcc.8b09764 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | JOURNAL OF PHYSICAL CHEMISTRY C, v.122, no.51, pp.29330 - 29337 | - |
dc.identifier.wosid | 000454751000026 | - |
dc.citation.endPage | 29337 | - |
dc.citation.number | 51 | - |
dc.citation.startPage | 29330 | - |
dc.citation.title | JOURNAL OF PHYSICAL CHEMISTRY C | - |
dc.citation.volume | 122 | - |
dc.contributor.affiliatedAuthor | Hong, Suk Bong | - |
dc.identifier.scopusid | 2-s2.0-85059698215 | - |
dc.description.journalClass | 1 | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.type.docType | Article | - |
dc.subject.keywordPlus | ZEOLITES | - |
dc.subject.keywordPlus | SITES | - |
dc.subject.keywordPlus | NOX | - |
dc.subject.keywordPlus | CU-ZSM-5 | - |
dc.subject.keywordPlus | SSZ-13 | - |
dc.subject.keywordPlus | BETA | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical | - |
dc.relation.journalWebOfScienceCategory | Nanoscience & Nanotechnology | - |
dc.relation.journalWebOfScienceCategory | Materials Science, Multidisciplinary | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Chemistry | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalResearchArea | Materials Science | - |
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