Matches in SemOpenAlex for { <https://semopenalex.org/work/W2016321301> ?p ?o ?g. }
- W2016321301 endingPage "32" @default.
- W2016321301 startingPage "25" @default.
- W2016321301 abstract "The superoxide species generated by the interaction of titanosilicate molecular sieves, TS-1 and TiMCM-41, with aqueous H2O2 have been studied by EPR spectroscopy. Three paramagnetic Ti(IV)-superoxide radical species (A, B, and C, respectively) have been observed in TS-1 samples; mainly species B has been identified in TiMCM-41. The Ti(IV) ions in the superoxide are in framework positions. Species B is more abundant than species A and C. On interaction with aqueous H2O2 the geometry of titanium expands from tetra- to hexacoordination in species A and C and to pentacoordination in species B. The EPR spectra of the Ti(IV)-superoxide species are characterized by rhombic g tensors. The effects of solvents, substrate (allyl alcohol), and temperature on the EPR spectra and distribution of species A–C have been examined. In situ EPR studies have revealed that species A and C are more reactive toward the oxidation of allylalcohol to the corresponding epoxide than species B. Variable-temperature EPR studies (77–190 K) have provided evidence, for the first time, of the superoxide–hydroperoxide/peroxide interconversions. At higher temperatures Ti(IV)-superoxide is the preferred geometry. At lower temperatures Ti(IV)-hydroperoxide/peroxide is formed. Species B did not exhibit such an interconversion. It is concluded that, in addition to the framework Ti centers being able to expand their coordination geometry from 4 to 6 and the hydrophobic nature of the titanosilicate structure, the relative concentrations of the superoxide and hydroperoxide/peroxide under reaction conditions are crucial factors determining catalytic activity and, especially, selectivity." @default.
- W2016321301 created "2016-06-24" @default.
- W2016321301 creator A5028331487 @default.
- W2016321301 creator A5054530057 @default.
- W2016321301 creator A5087509201 @default.
- W2016321301 date "2001-10-01" @default.
- W2016321301 modified "2023-09-25" @default.
- W2016321301 title "Reactive Oxygen Species in Titanosilicates TS-1 and TiMCM-41: An In Situ EPR Spectroscopic Study" @default.
- W2016321301 cites W147873127 @default.
- W2016321301 cites W1505061533 @default.
- W2016321301 cites W1578707808 @default.
- W2016321301 cites W17846362 @default.
- W2016321301 cites W192007027 @default.
- W2016321301 cites W1971546292 @default.
- W2016321301 cites W1975563471 @default.
- W2016321301 cites W1977539024 @default.
- W2016321301 cites W1978271961 @default.
- W2016321301 cites W1982784029 @default.
- W2016321301 cites W1989552004 @default.
- W2016321301 cites W1990187111 @default.
- W2016321301 cites W200785817 @default.
- W2016321301 cites W2009493749 @default.
- W2016321301 cites W2013708137 @default.
- W2016321301 cites W2017063205 @default.
- W2016321301 cites W2024536262 @default.
- W2016321301 cites W2024663420 @default.
- W2016321301 cites W2042602209 @default.
- W2016321301 cites W2048097017 @default.
- W2016321301 cites W2058969938 @default.
- W2016321301 cites W2063628162 @default.
- W2016321301 cites W2067344779 @default.
- W2016321301 cites W2069325652 @default.
- W2016321301 cites W2076511171 @default.
- W2016321301 cites W2082593293 @default.
- W2016321301 cites W2086702754 @default.
- W2016321301 cites W2087117322 @default.
- W2016321301 cites W2091583803 @default.
- W2016321301 cites W2094588960 @default.
- W2016321301 cites W2108753031 @default.
- W2016321301 cites W2312199777 @default.
- W2016321301 cites W79025277 @default.
- W2016321301 cites W989064382 @default.
- W2016321301 doi "https://doi.org/10.1006/jcat.2001.3315" @default.
- W2016321301 hasPublicationYear "2001" @default.
- W2016321301 type Work @default.
- W2016321301 sameAs 2016321301 @default.
- W2016321301 citedByCount "45" @default.
- W2016321301 countsByYear W20163213012012 @default.
- W2016321301 countsByYear W20163213012013 @default.
- W2016321301 countsByYear W20163213012014 @default.
- W2016321301 countsByYear W20163213012015 @default.
- W2016321301 countsByYear W20163213012016 @default.
- W2016321301 countsByYear W20163213012017 @default.
- W2016321301 countsByYear W20163213012018 @default.
- W2016321301 crossrefType "journal-article" @default.
- W2016321301 hasAuthorship W2016321301A5028331487 @default.
- W2016321301 hasAuthorship W2016321301A5054530057 @default.
- W2016321301 hasAuthorship W2016321301A5087509201 @default.
- W2016321301 hasConcept C121332964 @default.
- W2016321301 hasConcept C139066938 @default.
- W2016321301 hasConcept C161790260 @default.
- W2016321301 hasConcept C178790620 @default.
- W2016321301 hasConcept C181199279 @default.
- W2016321301 hasConcept C184651966 @default.
- W2016321301 hasConcept C185592680 @default.
- W2016321301 hasConcept C187961010 @default.
- W2016321301 hasConcept C2776778087 @default.
- W2016321301 hasConcept C2780795997 @default.
- W2016321301 hasConcept C2781048764 @default.
- W2016321301 hasConcept C46141821 @default.
- W2016321301 hasConcept C48349386 @default.
- W2016321301 hasConcept C533411734 @default.
- W2016321301 hasConcept C55493867 @default.
- W2016321301 hasConcept C75473681 @default.
- W2016321301 hasConceptScore W2016321301C121332964 @default.
- W2016321301 hasConceptScore W2016321301C139066938 @default.
- W2016321301 hasConceptScore W2016321301C161790260 @default.
- W2016321301 hasConceptScore W2016321301C178790620 @default.
- W2016321301 hasConceptScore W2016321301C181199279 @default.
- W2016321301 hasConceptScore W2016321301C184651966 @default.
- W2016321301 hasConceptScore W2016321301C185592680 @default.
- W2016321301 hasConceptScore W2016321301C187961010 @default.
- W2016321301 hasConceptScore W2016321301C2776778087 @default.
- W2016321301 hasConceptScore W2016321301C2780795997 @default.
- W2016321301 hasConceptScore W2016321301C2781048764 @default.
- W2016321301 hasConceptScore W2016321301C46141821 @default.
- W2016321301 hasConceptScore W2016321301C48349386 @default.
- W2016321301 hasConceptScore W2016321301C533411734 @default.
- W2016321301 hasConceptScore W2016321301C55493867 @default.
- W2016321301 hasConceptScore W2016321301C75473681 @default.
- W2016321301 hasIssue "1" @default.
- W2016321301 hasLocation W20163213011 @default.
- W2016321301 hasOpenAccess W2016321301 @default.
- W2016321301 hasPrimaryLocation W20163213011 @default.
- W2016321301 hasRelatedWork W1162079594 @default.
- W2016321301 hasRelatedWork W1520525278 @default.
- W2016321301 hasRelatedWork W1846758701 @default.
- W2016321301 hasRelatedWork W2003503672 @default.