Matches in SemOpenAlex for { <https://semopenalex.org/work/W4242091257> ?p ?o ?g. }
Showing items 1 to 60 of
60
with 100 items per page.
- W4242091257 endingPage "i" @default.
- W4242091257 startingPage "i" @default.
- W4242091257 abstract "The kinetics of liquid-phase hydrogenation of citral (3,7-dimethyl-2,6-octadienal) on Pt/TiO2 catalysts were studied between 298–423 K and 7–21 atm H2 and compared to those reported earlier for Pt/SiO2 catalysts. The kinetic data were shown to be free of transport limitations by application of the Madon–Boudart test and the Weisz–Prater criterion. Near zero- and first-order kinetics were observed for the initial rate of citral hydrogenation over the Pt/TiO2-LTR (Tred=473K) and Pt/SiO2 catalysts with respect to citral concentration and hydrogen pressure, respectively. In contrast, each dependency dropped by about one order with Pt/TiO2-HTR (Tred=773K) catalysts as they were negative first-order on citral concentration and near zero-order on hydrogen pressure. Furthermore, the initial rates over Pt/TiO2-LTR and Pt/SiO2 exhibited an activity minimum as temperature increased whereas conventional Arrhenius behavior was exhibited by Pt/TiO2-HTR with an activation energy of 18 kcal/mol. Pt/TiO2-LTR and HTR catalysts initially exhibited 90% selectivity to the unsaturated alcohol as compared to 40% for hydrogenation over Pt/SiO2. Metal–support interactions (MSI) resulted in a dramatic enhancement in specific activity at 373 K, 20 atm H2 and 1 M citral in hexane as Pt/TiO2-HTR exhibited a turnover frequency of 1.0 compared to 0.02 s−1 for Pt/TiO2-LTR and 0.004 s−1 for Pt/SiO2. The reaction kinetics with Pt/TiO2-HTR in the differential conversion regime were described by a conventional Langmuir–Hinshelwood model assuming quasi-equilibrium for reactant adsorption, competitive adsorption between citral and hydrogen, and addition of the first H atom as the rate determining step. The reaction rate at higher conversions was modeled by invoking a decarbonylation reaction similar to that proposed earlier for this reaction over Pt/SiO2 catalysts to explain any observed deactivation." @default.
- W4242091257 created "2022-05-12" @default.
- W4242091257 date "1973-07-01" @default.
- W4242091257 modified "2023-10-05" @default.
- W4242091257 title "Editorial Board" @default.
- W4242091257 doi "https://doi.org/10.1016/0021-9517(73)90045-6" @default.
- W4242091257 hasPublicationYear "1973" @default.
- W4242091257 type Work @default.
- W4242091257 citedByCount "0" @default.
- W4242091257 crossrefType "other" @default.
- W4242091257 hasConcept C121332964 @default.
- W4242091257 hasConcept C13965031 @default.
- W4242091257 hasConcept C147789679 @default.
- W4242091257 hasConcept C148898269 @default.
- W4242091257 hasConcept C161790260 @default.
- W4242091257 hasConcept C178790620 @default.
- W4242091257 hasConcept C185592680 @default.
- W4242091257 hasConcept C2777278459 @default.
- W4242091257 hasConcept C2781370763 @default.
- W4242091257 hasConcept C36663273 @default.
- W4242091257 hasConcept C43617362 @default.
- W4242091257 hasConcept C512968161 @default.
- W4242091257 hasConcept C62520636 @default.
- W4242091257 hasConcept C86183883 @default.
- W4242091257 hasConcept C95121573 @default.
- W4242091257 hasConceptScore W4242091257C121332964 @default.
- W4242091257 hasConceptScore W4242091257C13965031 @default.
- W4242091257 hasConceptScore W4242091257C147789679 @default.
- W4242091257 hasConceptScore W4242091257C148898269 @default.
- W4242091257 hasConceptScore W4242091257C161790260 @default.
- W4242091257 hasConceptScore W4242091257C178790620 @default.
- W4242091257 hasConceptScore W4242091257C185592680 @default.
- W4242091257 hasConceptScore W4242091257C2777278459 @default.
- W4242091257 hasConceptScore W4242091257C2781370763 @default.
- W4242091257 hasConceptScore W4242091257C36663273 @default.
- W4242091257 hasConceptScore W4242091257C43617362 @default.
- W4242091257 hasConceptScore W4242091257C512968161 @default.
- W4242091257 hasConceptScore W4242091257C62520636 @default.
- W4242091257 hasConceptScore W4242091257C86183883 @default.
- W4242091257 hasConceptScore W4242091257C95121573 @default.
- W4242091257 hasIssue "1" @default.
- W4242091257 hasLocation W42420912571 @default.
- W4242091257 hasOpenAccess W4242091257 @default.
- W4242091257 hasPrimaryLocation W42420912571 @default.
- W4242091257 hasRelatedWork W1976189486 @default.
- W4242091257 hasRelatedWork W2040461940 @default.
- W4242091257 hasRelatedWork W2088855430 @default.
- W4242091257 hasRelatedWork W2161069611 @default.
- W4242091257 hasRelatedWork W2518520268 @default.
- W4242091257 hasRelatedWork W2996821302 @default.
- W4242091257 hasRelatedWork W3034761738 @default.
- W4242091257 hasRelatedWork W3130208434 @default.
- W4242091257 hasRelatedWork W3155992455 @default.
- W4242091257 hasRelatedWork W2473931741 @default.
- W4242091257 hasVolume "30" @default.
- W4242091257 isParatext "true" @default.
- W4242091257 isRetracted "false" @default.
- W4242091257 workType "paratext" @default.