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Development of Magnesium Oxide–Zeolite Catalysts for Isomerization of Fatty Acids

  • Jianwei Zhang
  • Joseph Uknalis
  • Li Chen
  • Robert A. Moreau
  • Helen Ngo
Article
  • 8 Downloads

Abstract

Three zeolites were treated with magnesium nitrate hexahydrate (Mg(NO3)2⋅6H2O) salt to generate active magnesium oxide (MgO)–zeolite catalysts for the isomerization of oleic acid to give the iso-oleic acid (precursor of isostearic acid). Isostearic acid is a crucial component used in the formulation of bio-lubricants including cosmetic and personal care products. The treatment step is intended to poison (or neutralize) the external acid sites of the zeolites, thus inhibiting the formation of by-products (i.e., dimer fatty acids). The acid sites, crystallinity, thermal property, morphology and elemental composition of the zeolites before and after treatments were investigated by scanning electron microscopy, fourier-transform spectroscopy, thermogravimetric analysis, and x-ray powder diffraction. In addition, the effect of a calcination step after treatment was examined to determine if this step was necessary to obtain an active and stable catalyst. As expected, the higher the concentration of MgO on the zeolites, the less dimer was detected in the isomerization products, while the conversion of oleic acid and selectivity of iso-oleic acid remained at a relatively high level. This is promising because the MgO has deprotonated the external acids of the zeolites to generate a high purity isostearic acid that is potentially suitable for personal care products.

Graphical Abstract

Keywords

Isomerization Magnesium oxide Size selectivity Zeolite 

Notes

Acknowledgements

The authors would like to acknowledge Mr. Kerby Jones for experimental help, and Daniel Micheroni at University of Chicago for PXRD characterization. The authors would also like to thank NIFA-AFRI (Grant Award # 2013-67021-21142) for providing partial funding support.

Compliance with Ethical Standards

Disclosures

Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture. USDA is an equal opportunity provider and employer.

Supplementary material

10562_2018_2601_MOESM1_ESM.docx (2.7 mb)
Supplementary material 1 (DOCX 2746 KB)

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Copyright information

© This is a U.S. Government work and not under copyright protection in the US; foreign copyright protection may apply 2018

Authors and Affiliations

  • Jianwei Zhang
    • 1
    • 2
  • Joseph Uknalis
    • 2
  • Li Chen
    • 1
  • Robert A. Moreau
    • 2
  • Helen Ngo
    • 2
  1. 1.School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouChina
  2. 2.Eastern Regional Research CenterUSDA, ARSWyndmoorUSA

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