Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Ionic Liquids Grafted Mesoporous Silica for Chemical Fixation of CO.sub.2 to Cyclic Carbonate: Morphology Effect
Ist Teil von
Catalysis letters, 2022-03, Vol.152 (3), p.781
Ort / Verlag
Springer
Erscheinungsjahr
2022
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
Three mesoporous silica materials (MCM-41, MSN and BMMs) possessing different morphologies but similar hexagonal arranged mesopores with almost the same pore size (2-3 nm) were functionalized by Zn and [1-(trimethoxysilyl)propyl-3-methylimidazolium] ionic liquid (ILs) via post-grafting treatment. The ILs grafted mesoporous silicas were then characterized by porosity, microscopy and SAXS techniques, and the successful loading of Zn and ILs, as well as the different distribution of functional groups in different supports were shown. Furthermore, the cycloaddition reaction of CO.sub.2 with epoxide was employed to evaluate the influences of the ILs distribution, which was proved to be caused mainly by varying morphologies of different supports. All the catalysts showed good catalytic activities. Interestingly, at low temperature, the inter particle supported ILs in BMMs had the highest catalytic efficiency, while the aggregation grafting ILs on MCM-41 present the lowest activity. However, the mesoporous silicas with ordered arranged nanopores present the superiority at higher temperature. The results highlight the crucial role played by the morphology of the supports.