DC Field | Value | Language |
---|---|---|
dc.contributor.author | Luan, ZH | ko |
dc.contributor.author | Bae, Jae-Young | ko |
dc.contributor.author | Kevan, L | ko |
dc.date.accessioned | 2013-02-27T13:10:43Z | - |
dc.date.available | 2013-02-27T13:10:43Z | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2000-10 | - |
dc.identifier.citation | CHEMISTRY OF MATERIALS, v.12, no.10, pp.3202 - 3207 | - |
dc.identifier.issn | 0897-4756 | - |
dc.identifier.uri | http://hdl.handle.net/10203/68767 | - |
dc.description.abstract | Mesoporous silica SBA-15 molecular sieves have been incorporated with various amounts of vanadium via incipient-wetness impregnation with vanadium oxide triisopropoxide in hexane followed by calcination. The products (VSBA-15) have been characterized by nitrogen adsorption and diffuse reflectance UV-visible and electron spin resonance spectroscopies. The results show that the vanadium exists as isolated tetrahedral V5+ ions in dehydrated VSBA-15 with Si/V greater than or equal to 40 while vanadium chains develop as vanadium loading increases. Upon hydration a large fraction of the vanadium is transformed to square pyramidal and distorted octahedral V5+ ions by additional coordination to water molecules, suggesting an interior wall surface location for these V5+ ions. Upon CO reduction or incorporation of N-alkylphenothiazines (PCn), part of the V5+ is reduced to vanadyl VO2+ ions. While incorporation of PCn into VSBA-15 in the dark generates some PCn+ cation radicals, ultraviolet photoionization at room temperature further increases the yield for Si/V = 80 and 40. The PCn+ radicals are more stable in VSBA-15 than in siliceous SBA-15, and the photoyield increases with vanadium loading. The photoyield and stability of PCn+ also increase with increasing alkyl chain length of the N-alkylphenothiazines. | - |
dc.language | English | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | ELECTRON-SPIN-RESONANCE | - |
dc.subject | PHOTOINDUCED CHARGE SEPARATION | - |
dc.subject | PHENOTHIAZINE-DERIVATIVES | - |
dc.subject | ECHO MODULATION | - |
dc.subject | PORE SIZES | - |
dc.subject | VANADIUM | - |
dc.subject | OXIDATION | - |
dc.subject | TITANIUM | - |
dc.subject | MCM-41 | - |
dc.subject | CATALYSTS | - |
dc.title | Vanadosilicate mesoporous SBA-15 molecular sieves incorporated with N-alkylphenothiazines | - |
dc.type | Article | - |
dc.identifier.wosid | 000090034400057 | - |
dc.type.rims | ART | - |
dc.citation.volume | 12 | - |
dc.citation.issue | 10 | - |
dc.citation.beginningpage | 3202 | - |
dc.citation.endingpage | 3207 | - |
dc.citation.publicationname | CHEMISTRY OF MATERIALS | - |
dc.identifier.doi | 10.1021/cm000318q | - |
dc.contributor.nonIdAuthor | Luan, ZH | - |
dc.contributor.nonIdAuthor | Kevan, L | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | ELECTRON-SPIN-RESONANCE | - |
dc.subject.keywordPlus | PHOTOINDUCED CHARGE SEPARATION | - |
dc.subject.keywordPlus | PHENOTHIAZINE-DERIVATIVES | - |
dc.subject.keywordPlus | ECHO MODULATION | - |
dc.subject.keywordPlus | PORE SIZES | - |
dc.subject.keywordPlus | VANADIUM | - |
dc.subject.keywordPlus | OXIDATION | - |
dc.subject.keywordPlus | TITANIUM | - |
dc.subject.keywordPlus | MCM-41 | - |
dc.subject.keywordPlus | CATALYSTS | - |
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