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

2 Citations (Scopus)

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
Volume570
DOIs
Publication statusPublished - Jan 25 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Process Chemistry and Technology

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