Matches in SemOpenAlex for { <https://semopenalex.org/work/W1970793506> ?p ?o ?g. }
Showing items 1 to 89 of
89
with 100 items per page.
- W1970793506 endingPage "322" @default.
- W1970793506 startingPage "318" @default.
- W1970793506 abstract "Different phosphines (PR3, R = phenyl, 4-methoxyphenyl) are demonstrated to be useful probe molecules for the spatial location and quantification of noble metal (NM) atoms within mesoporous and microporous support materials, such as silica A200, mesoporous SBA-15, and different zeolites Y. For this purpose, the high NMR sensitivity of 31P nuclei (spin I = ½, abundance of 100%) and the characteristic chemical shifts of phosphine complexes formed with noble metals were utilized. A straightforward method of physically mixing the reduced noble metal-containing catalysts with the solid phosphine powders and heating under well-defined conditions is shown. Complexation of triphenylphosphine (PPh3) and tris(4-methoxyphenyl)phosphine, P(PhOMe)3, with Pt, Rh, Pd, and Ru on open surfaces and in mesopores leads to characteristic 31P MAS NMR signals at δ = 33–41 ppm. Because of the different molecular diameters of PPh3 (0.72 nm) and P(PhOMe)3 (0.91 nm), adsorption of these two probe molecules allows to distinguish between noble metal atoms located at the outer surface of zeolite particles and those in secondary mesopores and in supercages of zeolites Y. For the first time this method enables the characterization of noble metals directly using probe molecules and 31P MAS NMR spectroscopy." @default.
- W1970793506 created "2016-06-24" @default.
- W1970793506 creator A5027924274 @default.
- W1970793506 creator A5035952206 @default.
- W1970793506 creator A5091809100 @default.
- W1970793506 date "1987-07-01" @default.
- W1970793506 modified "2023-09-26" @default.
- W1970793506 title "Preparation effects in zeolite-supported metal catalysts: Influence of decomposition/reduction on ru particle size" @default.
- W1970793506 cites W1585625936 @default.
- W1970793506 cites W1984951499 @default.
- W1970793506 cites W1985797680 @default.
- W1970793506 cites W2013922411 @default.
- W1970793506 cites W2016000297 @default.
- W1970793506 cites W2038188454 @default.
- W1970793506 cites W2044163171 @default.
- W1970793506 cites W2075236727 @default.
- W1970793506 cites W2079982357 @default.
- W1970793506 cites W2080823008 @default.
- W1970793506 cites W2082024013 @default.
- W1970793506 cites W2084284647 @default.
- W1970793506 cites W2092192291 @default.
- W1970793506 cites W2116920836 @default.
- W1970793506 doi "https://doi.org/10.1016/0021-9517(87)90239-9" @default.
- W1970793506 hasPublicationYear "1987" @default.
- W1970793506 type Work @default.
- W1970793506 sameAs 1970793506 @default.
- W1970793506 citedByCount "6" @default.
- W1970793506 countsByYear W19707935062021 @default.
- W1970793506 crossrefType "journal-article" @default.
- W1970793506 hasAuthorship W1970793506A5027924274 @default.
- W1970793506 hasAuthorship W1970793506A5035952206 @default.
- W1970793506 hasAuthorship W1970793506A5091809100 @default.
- W1970793506 hasConcept C105281773 @default.
- W1970793506 hasConcept C121530826 @default.
- W1970793506 hasConcept C147789679 @default.
- W1970793506 hasConcept C150394285 @default.
- W1970793506 hasConcept C161790260 @default.
- W1970793506 hasConcept C175583648 @default.
- W1970793506 hasConcept C178790620 @default.
- W1970793506 hasConcept C179104552 @default.
- W1970793506 hasConcept C185592680 @default.
- W1970793506 hasConcept C2775871042 @default.
- W1970793506 hasConcept C2777247709 @default.
- W1970793506 hasConcept C2777716191 @default.
- W1970793506 hasConcept C2778077586 @default.
- W1970793506 hasConcept C32909587 @default.
- W1970793506 hasConcept C521398313 @default.
- W1970793506 hasConcept C544153396 @default.
- W1970793506 hasConcept C82776694 @default.
- W1970793506 hasConcept C86381522 @default.
- W1970793506 hasConceptScore W1970793506C105281773 @default.
- W1970793506 hasConceptScore W1970793506C121530826 @default.
- W1970793506 hasConceptScore W1970793506C147789679 @default.
- W1970793506 hasConceptScore W1970793506C150394285 @default.
- W1970793506 hasConceptScore W1970793506C161790260 @default.
- W1970793506 hasConceptScore W1970793506C175583648 @default.
- W1970793506 hasConceptScore W1970793506C178790620 @default.
- W1970793506 hasConceptScore W1970793506C179104552 @default.
- W1970793506 hasConceptScore W1970793506C185592680 @default.
- W1970793506 hasConceptScore W1970793506C2775871042 @default.
- W1970793506 hasConceptScore W1970793506C2777247709 @default.
- W1970793506 hasConceptScore W1970793506C2777716191 @default.
- W1970793506 hasConceptScore W1970793506C2778077586 @default.
- W1970793506 hasConceptScore W1970793506C32909587 @default.
- W1970793506 hasConceptScore W1970793506C521398313 @default.
- W1970793506 hasConceptScore W1970793506C544153396 @default.
- W1970793506 hasConceptScore W1970793506C82776694 @default.
- W1970793506 hasConceptScore W1970793506C86381522 @default.
- W1970793506 hasIssue "1" @default.
- W1970793506 hasLocation W19707935061 @default.
- W1970793506 hasOpenAccess W1970793506 @default.
- W1970793506 hasPrimaryLocation W19707935061 @default.
- W1970793506 hasRelatedWork W1978476800 @default.
- W1970793506 hasRelatedWork W2041858867 @default.
- W1970793506 hasRelatedWork W2164430743 @default.
- W1970793506 hasRelatedWork W2349328629 @default.
- W1970793506 hasRelatedWork W2360144002 @default.
- W1970793506 hasRelatedWork W2386919420 @default.
- W1970793506 hasRelatedWork W2387140911 @default.
- W1970793506 hasRelatedWork W2986536318 @default.
- W1970793506 hasRelatedWork W3082007296 @default.
- W1970793506 hasRelatedWork W3182967556 @default.
- W1970793506 hasVolume "106" @default.
- W1970793506 isParatext "false" @default.
- W1970793506 isRetracted "false" @default.
- W1970793506 magId "1970793506" @default.
- W1970793506 workType "article" @default.