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DC Field | Value | Language |
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dc.citation.endPage | 2390 | - |
dc.citation.number | 7 | - |
dc.citation.startPage | 2368 | - |
dc.citation.title | PHYSICAL CHEMISTRY CHEMICAL PHYSICS | - |
dc.citation.volume | 15 | - |
dc.contributor.author | Szanyi, Janos | - |
dc.contributor.author | Kwak, Jahun | - |
dc.contributor.author | Zhu, Haiyang | - |
dc.contributor.author | Peden, Charles H. F. | - |
dc.date.accessioned | 2023-12-22T04:12:41Z | - |
dc.date.available | 2023-12-22T04:12:41Z | - |
dc.date.created | 2014-09-24 | - |
dc.date.issued | 2013-02 | - |
dc.description.abstract | The adsorption of CO and NO over Cu-SSZ-13 zeolite catalysts, highly active in the selective catalytic reduction of NOx with NH3, was investigated by FTIR spectroscopy, and the results obtained were compared to those collected from other Cu-ion exchanged zeolites (Y,FAU and ZSM-5). Under low CO pressures and at room temperature (295 K), CO forms monocarbonyls exclusively on the Cu+ ions, while in the presence of gas phase CO dicarbonyls on Cu+ and adsorbed CO on Cu2+ centers form, as well. At low (cryogenic) sample temperatures, tricarbonyl formation on Cu+ sites was also observed. The adsorption of NO produces IR bands that can be assigned to nitrosyls bound to both Cu+ and Cu2+ centers, and NO+ species located in charge compensating cationic positions of the chabasite framework. On the reduced Cu-SSZ-13 samples the formation of N2O was also detected. The assignment of the adsorbed NOx species was aided by adsorption experiments with isotopically labeled (NO)-N-15. The movement of Cu ions from the sterically hindered six member ring position to the more accessible cavity positions as a result of their interaction with adsorbates (NO and H2O) was clearly evidenced. Comparisons of the spectroscopy data obtained in the static transmission IR system to those collected in the flow-through diffuse reflectance cell points out that care must be taken when general conclusions are drawn about the adsorptive and reactive properties of metal cation centers based on a set of data collected under well defined, specific experimental conditions. | - |
dc.identifier.bibliographicCitation | PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.15, no.7, pp.2368 - 2390 | - |
dc.identifier.doi | 10.1039/c2cp43467a | - |
dc.identifier.issn | 1463-9076 | - |
dc.identifier.scopusid | 2-s2.0-84873030991 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/6432 | - |
dc.identifier.url | http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84873030991 | - |
dc.identifier.wosid | 000313891400015 | - |
dc.language | 영어 | - |
dc.publisher | ROYAL SOC CHEMISTRY | - |
dc.title | Characterization of Cu-SSZ-13 NH3 SCR catalysts: an in situ FTIR study | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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