Expanding the horizon of porous catalyst: Metal organic frameworks for base-catalyzed reactions
Hartmann M, Fischer M, Kriesten M (2016)
Publication Type: Conference contribution
Publication year: 2016
Journal
Publisher: Deutsche Wissens. Gesell. fur Erdoel, Erdgas und Kohle EV
Book Volume: 3
Pages Range: 71-
Conference Proceedings Title: DGMK Tagungsbericht
Event location: Berlin
ISBN: 9783941721661
Abstract
Advanced nanoporous molecular sieves are interesting materials for a wide range of potential applications. In the last decade, porous coordination polymers (metal organic frameworks, MOFs) have been identified as a novel class of microporous materials which play a major role in the development of advanced technologies for energy storage, air and water treatment, sensing, separations, catalysis and medicine. MOFs are inorganic-organic hybrid materials comprised of metal clusters linked by organic ligands principally through coordination bonds. In particular their modular design allows a rational construction of tailor-made pore systems, which can be adjusted in form and function to interacting molecules. The investigation of metal-organic framework (MOF) materials for application in heterogeneous catalysis has originated significant research activity in recent years. In addition to the use of MOFs as supports for the deposition of highly dispersed metal particles, the incorporation of molecular active center inside the porous structure has been studied. For this purpose, in the majority of the cases, metal centers have been introduced acting as Lewis acid centers or active sites for oxidation reactions. On the other hand, additional metal complexes, similar to those used in homogeneous catalysis, can be introduced into the framework by modifying the linker molecules with e.g. porphyrins or binaphthyls. Finally, the organic linkers can modified with moieties acting as acidic or basic sites. In this contribution, different MOFs carrying amino groups at their organic linkers, namely Fe-MIL-101-NH2, Al-MIL-101-NH2 and CAU-1, were synthesized and tested in the Knoevenagel condensation of benzaldehyde with malononitrile and with ethyl cyanoacetate, respectively. It is shown that the expected products benzylidenemalononitrile (BzMN) and ethyl α-cyanocinnamate (EtCC) are formed with selectivities of more than 99 % and yields of 90 to 95 % after 3 h (for BzMN) over Al-MIL-101-NH2, while all other catalysts tested exhibit significantly lower activity t. Finally, leaching tests confirm that the reaction is indeed heterogeneously catalyzed.
Authors with CRIS profile
Martin Hartmann
Lehrstuhl für Katalyse und nachhaltige Verfahren
Marcus Fischer
Lehrstuhl für Katalyse und nachhaltige Verfahren
Martin Kriesten
Professur für Katalyse
Additional Organisation(s)
How to cite
APA:
Hartmann, M., Fischer, M., & Kriesten, M. (2016). Expanding the horizon of porous catalyst: Metal organic frameworks for base-catalyzed reactions. In U. Balfanz, M. Beller, M. Marchionna, M. Bender, S. Ernst, H. Hager (Eds.), DGMK Tagungsbericht (pp. 71-). Berlin, DE: Deutsche Wissens. Gesell. fur Erdoel, Erdgas und Kohle EV.
MLA:
Hartmann, Martin, Marcus Fischer, and Martin Kriesten. "Expanding the horizon of porous catalyst: Metal organic frameworks for base-catalyzed reactions." Proceedings of the 2016 DGMK-International Conference on Catalysis - Novel Aspects in Petrochemistry and Refining, Berlin Ed. U. Balfanz, M. Beller, M. Marchionna, M. Bender, S. Ernst, H. Hager, Deutsche Wissens. Gesell. fur Erdoel, Erdgas und Kohle EV, 2016. 71-.
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