Lactic acid conversion to 2,3-pentanedione and acrylic acid over silica-supported sodium nitrate: Reaction optimization and identification of sodium lactate as the active catalyst

Douglas C. Wadley, Man S. Tam, Prashant B. Kokitkar, James E. Jackson, Dennis J. Miller

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Abstract

Lactic acid is converted to 2,3-pentanedione, acrylic acid, and other products in vapor-phase reactions over silica-supported sodium lactate formed from sodium nitrate. Multiparameter optimization of reaction conditions using a Box-Benkhen experimental design shows that the highest yield and selectivity to 2,3-pentanedione are achieved at low temperature, elevated pressure, and long contact time, while yield and selectivity to acrylic acid are most favorable at high temperature, low pressure, and short contact time. Post-reaction Fourier transform infrared spectroscopic analyses of the catalyst indicate that sodium nitrate as the initial catalyst material is transformed to sodium lactate at the onset of reaction via proton transfer from lactic acid to nitrate. The resultant nitric acid vaporizes as it is formed, leaving sodium lactate as the sole sodium-bearing species on the catalyst during reaction.

LanguageEnglish (US)
Pages162-171
Number of pages10
JournalJournal of Catalysis
Volume165
Issue number2
StatePublished - 1997

Profile

Sodium Lactate
sodium nitrates
lactates
lactic acid
acrylic acid
Lactic acid
Silicon Dioxide
Acrylics
Nitrates
Lactic Acid
Silica
Sodium
sodium
silicon dioxide
catalysts
acids
Catalysts
optimization
Acids
Bearings (structural)

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

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abstract = "Lactic acid is converted to 2,3-pentanedione, acrylic acid, and other products in vapor-phase reactions over silica-supported sodium lactate formed from sodium nitrate. Multiparameter optimization of reaction conditions using a Box-Benkhen experimental design shows that the highest yield and selectivity to 2,3-pentanedione are achieved at low temperature, elevated pressure, and long contact time, while yield and selectivity to acrylic acid are most favorable at high temperature, low pressure, and short contact time. Post-reaction Fourier transform infrared spectroscopic analyses of the catalyst indicate that sodium nitrate as the initial catalyst material is transformed to sodium lactate at the onset of reaction via proton transfer from lactic acid to nitrate. The resultant nitric acid vaporizes as it is formed, leaving sodium lactate as the sole sodium-bearing species on the catalyst during reaction.",
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T2 - Journal of Catalysis

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AU - Tam,Man S.

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AU - Jackson,James E.

AU - Miller,Dennis J.

PY - 1997

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