The Properties of Bicyclic and Multicyclic Hydrocarbons as Bio-derived Compression Ignition Fuels That Can Be Prepared via Efficient and Scalable Routes from Biomass
- BATTELLE (PACIFIC NW LAB)
- University of Tennessee
- scientist
- Los Alamos National Laboratory
- Yale University
A series of multicyclic hydrocarbons were synthesized in high yield and under mild conditions from 2,5-hexanedione, cyclohexanone and cyclopentanone, at scales of 200 g. Aldol products were obtained with conversions of 97%, 80-90% and 70% respectively, based on the consumption of starting materials. Cyclopentanone and cyclohexanone aldol condensations resulted in mixtures containing mainly the bicyclic products (90%) as well as tricyclic analogs (10%). The 2,5-hexanedione aldol condensation produced 50% methylcyclopentenone (MCP) as expected and about 50% oligomers. Surprisingly, the complex heavy fraction after removal of MCP contained mainly products of Michael addition of MCP and not self-aldol condensation products of MCP or MCP and 2,5-hexanedione. The hydrogenation-hydrodeoxygenation (HYD-HDO) of cyclohexanone- and cyclopentanone-derived reactants under nickel on alumina (Ni-Al2O3) catalyst at 250 °C and pressures between 800 to 1200 psig produced the expected saturated hydrocarbons with good recovery (80% and 76% respectively), with only small amounts of oxygenated residual starting materials remaining (<2%). However, the HYD-HDO of the 2,5-hexanedione aldol mixture produced an equally complex mixture compared to its respective aldol/Michael addition products which contained a large amount of hydroxy compounds (most likely cyclic alcohols). All crude mixtures, only treated to remove water after HYD-HDO, were evaluated for their properties as potential compression-ignition fuels: distillation curve, derived cetane number, sooting tendency, lower heating value and density. The results show the utility of these hydrocarbons as viable compression-ignition fuels or blendstocks, particularly the cyclopentanone- or cyclohexanone-derived products, or as components of the same.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Colorado State University
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830; EE0008726
- OSTI ID:
- 1813570
- Report Number(s):
- PNNL-SA-156518
- Journal Information:
- Sustainable Energy & Fuels, Journal Name: Sustainable Energy & Fuels Journal Issue: 12 Vol. 5
- Country of Publication:
- United States
- Language:
- English
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