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Article

Green Epoxidation of Olefins with ZnxAl/MgxAl-LDH Compounds: Influence of the Chemical Composition

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Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blv., 030018 Bucharest, Romania
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Research Center for Catalysts & Catalytic Processes, Faculty of Chemistry, University of Bucharest, 4-12 Regina Elisabeta Blv., 030018 Bucharest, Romania
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Faculty of Biology, University of Bucharest, 91-95 Splaiul Independenţei, 050095 Bucharest, Romania
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Research Center for Environmental Protection and Waste Management (PROTMED), Research Platform in Biology and Systems Ecology, Faculty of Biology, University of Bucharest, 91-95 Splaiul Independenţei, 050095 Bucharest, Romania
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National Institute of Materials Physics, 405A Atomistilor Street, 077125 Magurele, Romania
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National Institute for Lasers, Plasma and Radiation Physics, 077125 Magurele, Romania
*
Author to whom correspondence should be addressed.
Academic Editor: Anabela A. Valente
Catalysts 2022, 12(2), 145; https://doi.org/10.3390/catal12020145
Received: 23 December 2021 / Revised: 10 January 2022 / Accepted: 21 January 2022 / Published: 24 January 2022
This contribution concerns the effect of the chemical composition of the brucite-type layer of bi-cationic LDH materials ZnxAl and MgxAl (x = 2–5) and tri-cationic LDH MgyZnzAl (y + z = 4, y = 1, 2, 3) on their catalytic activity for olefin epoxidation with H2O2 in the presence of acetonitrile. LDH materials were prepared by the standard method of co-precipitation at constant pH 10, using an aqueous solution of the corresponding metal nitrates and a basic solution containing NaOH and Na2CO3. The fresh LDHs were calcined to yield the corresponding mixed oxides and then the recovery of the LDH structure by hydration of the mixed oxides was performed. The resulting samples were characterized by AAS, XRD, DRIFT, DR-UV–Vis, BET and determination of basic sites. The results of the catalytic tests for olefin epoxidation were well correlated with the basicity of the samples, which was in turn related to the M2+/Al3+ ratio and the electronegativity of different bivalent metals in the brucite-type layer. View Full-Text
Keywords: layered double hydroxides; base catalysts; oxidation; epoxide layered double hydroxides; base catalysts; oxidation; epoxide
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MDPI and ACS Style

Zăvoianu, R.; Cruceanu, A.; Pavel, O.D.; Bradu, C.; Florea, M.; Bîrjega, R. Green Epoxidation of Olefins with ZnxAl/MgxAl-LDH Compounds: Influence of the Chemical Composition. Catalysts 2022, 12, 145. https://doi.org/10.3390/catal12020145

AMA Style

Zăvoianu R, Cruceanu A, Pavel OD, Bradu C, Florea M, Bîrjega R. Green Epoxidation of Olefins with ZnxAl/MgxAl-LDH Compounds: Influence of the Chemical Composition. Catalysts. 2022; 12(2):145. https://doi.org/10.3390/catal12020145

Chicago/Turabian Style

Zăvoianu, Rodica, Anca Cruceanu, Octavian Dumitru Pavel, Corina Bradu, Mihaela Florea, and Ruxandra Bîrjega. 2022. "Green Epoxidation of Olefins with ZnxAl/MgxAl-LDH Compounds: Influence of the Chemical Composition" Catalysts 12, no. 2: 145. https://doi.org/10.3390/catal12020145

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