Hydrothermal decarboxylation of unsaturated fatty acids over PtSnx/C catalysts

Thomas M. Yeh, Ryan L. Hockstad, Suljo Linic, Phillip E. Savage

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Abstract Decarboxylation of fatty acids is a path to fuel-range hydrocarbons from renewable plant and seed oils. Pt/C is an effective hydrothermal catalyst for decarboxylating saturated fatty acids without added hydrogen, but it has shown low selectivity and activity for decarboxylating unsaturated fatty acids, which are prevalent in plant oils from soy and algae. To develop better decarboxylation catalysts, we compared three different Sn containing alloys, Pt3Sn/C, PtSn/C, and PtSn3/C, to Pt/C by performing batch reactions in liquid water at 350 °C for two hours with stearic (C18:0), oleic (C18:1), and linoleic (C18:2) acids. Pt/C gave yields of 0.70 ± 0.05, 0.16 ± 0.03, and 0.083 ± 0.009 for the C17 alkane, but none of the direct decarboxylation products (i.e., C17 alkenes), for the oleic and linoleic acid feeds. Stearic acid was the major byproduct from the unsaturated fatty acids. In contrast, the PtSnx/C catalysts provided two to three times higher C17 alkane yields at identical conditions. Experiments in D2O showed that water molecules were a source of hydrogen for saturation of the fatty acids. These results show that PtSnx alloys give better performance than Pt alone for the hydrothermal conversion of renewable fatty acids to fuel range hydrocarbons.

Original languageEnglish (US)
Article number9192
Pages (from-to)219-224
Number of pages6
JournalFuel
Volume156
DOIs
StatePublished - Apr 24 2015

Fingerprint

Unsaturated fatty acids
Unsaturated Fatty Acids
Fatty acids
Fatty Acids
Paraffins
Catalysts
Alkanes
Hydrocarbons
Saturated fatty acids
Linoleic acid
Hydrogen
Oilseeds
Stearic acid
Oleic acid
Algae
Olefins
Plant Oils
Byproducts
Water
Alkenes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

Yeh, Thomas M. ; Hockstad, Ryan L. ; Linic, Suljo ; Savage, Phillip E. / Hydrothermal decarboxylation of unsaturated fatty acids over PtSnx/C catalysts. In: Fuel. 2015 ; Vol. 156. pp. 219-224.
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Hydrothermal decarboxylation of unsaturated fatty acids over PtSnx/C catalysts. / Yeh, Thomas M.; Hockstad, Ryan L.; Linic, Suljo; Savage, Phillip E.

In: Fuel, Vol. 156, 9192, 24.04.2015, p. 219-224.

Research output: Contribution to journalArticle

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AB - Abstract Decarboxylation of fatty acids is a path to fuel-range hydrocarbons from renewable plant and seed oils. Pt/C is an effective hydrothermal catalyst for decarboxylating saturated fatty acids without added hydrogen, but it has shown low selectivity and activity for decarboxylating unsaturated fatty acids, which are prevalent in plant oils from soy and algae. To develop better decarboxylation catalysts, we compared three different Sn containing alloys, Pt3Sn/C, PtSn/C, and PtSn3/C, to Pt/C by performing batch reactions in liquid water at 350 °C for two hours with stearic (C18:0), oleic (C18:1), and linoleic (C18:2) acids. Pt/C gave yields of 0.70 ± 0.05, 0.16 ± 0.03, and 0.083 ± 0.009 for the C17 alkane, but none of the direct decarboxylation products (i.e., C17 alkenes), for the oleic and linoleic acid feeds. Stearic acid was the major byproduct from the unsaturated fatty acids. In contrast, the PtSnx/C catalysts provided two to three times higher C17 alkane yields at identical conditions. Experiments in D2O showed that water molecules were a source of hydrogen for saturation of the fatty acids. These results show that PtSnx alloys give better performance than Pt alone for the hydrothermal conversion of renewable fatty acids to fuel range hydrocarbons.

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