Conversion of glycerol to lactic acid over Au/bentonite catalysts in alkaline solution

Sever B., Yıldız M.

REACTION KINETICS MECHANISMS AND CATALYSIS, vol.130, no.2, pp.863-874, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 130 Issue: 2
  • Publication Date: 2020
  • Doi Number: 10.1007/s11144-020-01805-9
  • Journal Name: REACTION KINETICS MECHANISMS AND CATALYSIS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, Metadex, Civil Engineering Abstracts
  • Page Numbers: pp.863-874
  • Keywords: Lactic acid, Au, bentonite catalyst, Glycerol, SELECTIVE OXIDATION, SUPPORT, CARBON
  • Kocaeli University Affiliated: Yes

Abstract

The oxidation of glycerol into lactic acid using 1 wt% Au/bentonite as heterogeneous catalyst was studied. Several reaction parameters were evaluated: catalyst reduction, oxygen presence, catalyst amount, hydroxide type and NaOH/glycerol molar ratio and reaction time. The textural and structural properties of the bentonite supported Au catalysts were evaluated by XRD, SEM and ICP. The reactions were performed in a 100 mL volume three-necked and round-bottomed flask placed in an oil bath at 90 degrees C reaction temperature and atmospheric pressure. It was possible to achieve a glycerol conversion of about 82.4% with selectivity to lactic acid of 92.3% and 76.1% yield, at 90 degrees C of reaction temperature, NaOH/glycerol = 8 mol ratio by using 0.25 g catalyst after 240 min reaction.