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Inverse relationship of dimensionality and catalytic activity in CO2 transformation: a systematic investigation by comparing multidimensional metal-organic frameworks

Title
Inverse relationship of dimensionality and catalytic activity in CO2 transformation: a systematic investigation by comparing multidimensional metal-organic frameworks
Authors
Babu, RobinRoshan, RoshithGim, YeongrokJang, Yun HeeKurisingal, Jintu FrancisKim, Dong WooPark, Dae-Won
DGIST Authors
Gim, Yeongrok; Jang, Yun Hee
Issue Date
2017-08
Citation
Journal of Materials Chemistry A, 5(30), 15961-15969
Type
Article
Article Type
Article
Keywords
Carbon DioxideCatalysisCatalyst ActivityCatalystsCatalytic PerformanceChemical FixationConversionCoordination EnvironmentCrystalline MaterialsCyclic Carbonate SynthesisCycloadditionCycloaddition ReactionDensity Functional TheoryDioxide CaptureEpoxidesHighly EfficientIndiumInverse RelationshipMetal Organic Framework (MOF)Metal TestingOrganometallicsPhotocatalystPropylene OxideReductionSolid Acid CatalystsStructural InvestigationUnsaturated Metal Centers
ISSN
2050-7488
Abstract
The correlation between dimensionality and active sites on deciding the catalytic performance of an MOF catalyst in CO2-epoxide cycloaddition reactions has been studied. Seven In(iii) based MOFs built from carboxylic and N-donor ligands possessing different dimensionalities and distinct coordination environments were chosen as solid acid catalysts for this study. The origin of the catalytic activity of an In3+/TBAB bifunctional system in a CO2-PO reaction was studied in detail by performing density functional theory (DFT) calculations at the M06/LACVP∗∗++ level. The energy barrier of the propylene oxide ring opening in the presence of In3+/Br- is 11.5 kcal mol-1, which is significantly lower than those of un-catalyzed (55-63 kcal mol-1) and Br--catalyzed (19.5 kcal mol-1) reactions, which confirms the importance of the In3+/Br- binary catalytic system in the CO2-epoxide cycloaddition reactions. The one-dimensional (1D) MOF with unsaturated metal centers exhibited higher catalytic activity (PO conversion: 91%, temperature: 50 °C, and time: 12 h) than the two- and three-dimensional MOFs. The roles of dimensionality and unsaturated metal centers in cycloaddition reactions were explained on the basis of the results of activity testing and structural investigations. In addition, a plausible reaction mechanism for the catalytic activity of the 1D MOF was proposed with reference to our structure-density functional theory correlations. © 2017 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/4443
DOI
10.1039/c7ta04004k
Publisher
Royal Society of Chemistry
Files:
There are no files associated with this item.
Collection:
ETC1. Journal Articles


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