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Structural and surface study of calcium glyceroxide, an active phase for biodiesel production under heterogeneous catalysis

AuthorsLeón-Reina, Laura; Cabeza, Aurelio; Rius, Jordi ; Maireles-Torres, Pedro; Alba Rubio, Ana Carolina ; López Granados, Manuel
Issue DateApr-2013
CitationJournal of Catalysis 300: 30-36 (2013)
AbstractCalcium diglyceroxide has been reported as a very active phase in the transesterification of triglycerides with methanol for biodiesel production. This work reports on the determination of the crystal structure of Ca diglyceroxide by Patterson-based direct methods from synchrotron X-ray powder diffraction (XRD) data in combination with characterisation by Differential Thermal Analysis-Thermogravimetry (DTA-TG), Scanning Electron Microscopy (SEM) and X-ray Photoelectron and Fourier Transform-Infrared spectroscopies (XPS and FT-IR). Its crystal structure is formed by molecular tetramers held together by a complex H-bond network. Both the XRD structural determination and the O1s XPS core level indicate the presence of a basic non-protonated O- anion at the surface of Ca diglyceroxide. Along with the presence of surface lipophilic CHx units, this O- anion may be the origin of this molecule's high activity relative to CaO.
Publisher version (URL)https://doi.org/10.1016/j.jcat.2012.12.016
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