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Article

Calcium Hydroxyapatite: A Highly Stable and Selective Solid Catalyst for Glycerol Polymerization

Univ. Lille, CNRS, Centrale Lille, Univ. Artois, UMR 8181—UCCS—Unité de Catalyse et Chimie du Solide, F-59000 Lille, France
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Academic Editors: Francesco Ruffo and Roberto Esposito
Catalysts 2021, 11(10), 1247; https://doi.org/10.3390/catal11101247
Received: 28 September 2021 / Revised: 11 October 2021 / Accepted: 12 October 2021 / Published: 17 October 2021
(This article belongs to the Special Issue Catalytic Valorization of Glycerol: Strategies and Perspectives)
Calcium-based catalysts are of high interest for glycerol polymerization due to their high catalytic activity and large availability. However, their poor stability under reaction conditions is an issue. In the present study, we investigated the stability and catalytic activity of Ca-hydroxyapatites (HAps) as one of the most abundant Ca-source in nature. A stochiometric, Ca-deficient and Ca-rich HAps were synthesized and tested as catalysts in the glycerol polymerization reaction. Deficient and stochiometric HAps exhibited a remarkable 100% selectivity to triglycerol at 15% of glycerol conversion at 245 °C after 8 h of reaction in the presence of 0.5 mol.% of catalyst. Moreover, under the same reaction conditions, Ca-rich HAp showed a high selectivity (88%) to di- and triglycerol at a glycerol conversion of 27%. Most importantly, these catalysts were unexpectedly stable towards leaching under the reaction conditions based on the ICP-OES results. However, based on the catalytic tests and characterization analysis performed by XRD, XPS, IR, TGA-DSC and ICP-OES, we found that HAps can be deactivated by the presence of the reaction products themselves, i.e., water and polymers. View Full-Text
Keywords: hydroxyapatite; ca-based catalyst; stability; polyglycerol hydroxyapatite; ca-based catalyst; stability; polyglycerol
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MDPI and ACS Style

Ebadipour, N.; Paul, S.; Katryniok, B.; Dumeignil, F. Calcium Hydroxyapatite: A Highly Stable and Selective Solid Catalyst for Glycerol Polymerization. Catalysts 2021, 11, 1247. https://doi.org/10.3390/catal11101247

AMA Style

Ebadipour N, Paul S, Katryniok B, Dumeignil F. Calcium Hydroxyapatite: A Highly Stable and Selective Solid Catalyst for Glycerol Polymerization. Catalysts. 2021; 11(10):1247. https://doi.org/10.3390/catal11101247

Chicago/Turabian Style

Ebadipour, Negisa, Sébastien Paul, Benjamin Katryniok, and Franck Dumeignil. 2021. "Calcium Hydroxyapatite: A Highly Stable and Selective Solid Catalyst for Glycerol Polymerization" Catalysts 11, no. 10: 1247. https://doi.org/10.3390/catal11101247

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