期刊
JOURNAL OF CATALYSIS
卷 300, 期 -, 页码 30-36出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.12.016
关键词
Calcium glyceroxide; Biodiesel; Heterogeneous catalysis
资金
- Spanish Ministry of Science and Innovation [MAT2010-15175, ENE2009-12743-C04-01, ENE2009-12743-C04-03, MAT2009-07967, NANOSELECT CSD2007-00041]
- Junta de Andalucia [P09-FQM-5070]
- FEDER
Calcium 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 CH units, this O- anion may be the origin of this molecule's high activity relative to CaO. (C) 2012 Elsevier Inc. All rights reserved.
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