Silica-supported chromia-titania catalysts for selective formation of lactic acid from a triose in water

Atsushi Takagaki, Hiroshi Goto, Ryuji Kikuchi, S. Ted Oyama

Research output: Contribution to journalArticle

Abstract

A variety of silica-supported metal oxide catalysts were prepared by the incipient wetness impregnation method and were used for the conversion of dihydroxyacetone to lactic acid. A titanium oxide catalyst with Brønsted acid sites was selective to an intermediate, pyruvaldehyde and a chromium oxide catalyst with Lewis acid sites was selective to lactic acid. The co-impregnation of chromium- and titanium oxides with different ratios accelerated the reaction rate and improved the lactic acid yield up to 80% at 130 °C. Pyridine-adsorbed Fourier-transform infrared spectroscopy indicated that the silica-supported mixed oxides had both Brønsted acid and Lewis acid sites and the trend of the Lewis/Brønsted ratio was close to that of selectivity to lactic acid. Diffuse reflectance UV–vis spectroscopy showed that the silica-supported chromia-titania catalyst composed of isolated Cr and Ti species in tetrahedral coordination. Kinetic analysis revealed that the two critical rate constants, pyruvaldehyde formation and lactic acid formation, for the chromia-titania catalyst were much higher than those of the titania and chromia catalysts.

Original languageEnglish
Pages (from-to)200-208
Number of pages9
JournalApplied Catalysis A: General
DOIs
Publication statusPublished - Jan 25 2019
Externally publishedYes

Fingerprint

Trioses
Lactic acid
Silicon Dioxide
Lactic Acid
Titanium
Silica
Catalysts
Water
Pyruvaldehyde
Lewis Acids
Acids
Titanium oxides
Impregnation
Oxides
Chromium
Dihydroxyacetone
Pyridine
Reaction rates
Fourier transform infrared spectroscopy
titanium dioxide

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

Cite this

Silica-supported chromia-titania catalysts for selective formation of lactic acid from a triose in water. / Takagaki, Atsushi; Goto, Hiroshi; Kikuchi, Ryuji; Oyama, S. Ted.

In: Applied Catalysis A: General, 25.01.2019, p. 200-208.

Research output: Contribution to journalArticle

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