Acrylic acid synthesis from lactic acid over hydroxyapatite catalysts with various cations and anions

Yumiko Matsuura, Ayumu Onda, Shuhei Ogo, Kazumichi Yanagisawa

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We prepared substituted hydroxyapatite catalysts, such as Ca 10(PO4)6(OH)2, Sr 10(PO4)6(OH)2, Pb 10(PO4)6(OH)2, Ca 10(VO4)6(OH)2, and Sr 10(VO4)6(OH)2, and carried out conversions of lactic acid over the prepared catalysts. The hydroxyapatite catalysts had stabilities for the reaction media under flowing gas including lactic acid and water at 623 K. The hydroxyapatite catalysts exhibited markedly higher acrylic acid yields than those of P2O5/SiO 2 and MgO catalysts. In the lactic acid conversions, the relatively acidic catalysts, such as P2O5/SiO2, Ca 10(VO4)6(OH)2 and Sr 10(VO4)6(OH)2 catalysts, accelerated the formations of acetaldehyde and propionic acid, whereas the relatively basic catalysts, such as MgO and Pb10(PO4)6(OH) 2 catalysts, gave large amounts of unidentified products. On the other hand, the moderate acid-base catalysts, such as Ca10(PO 4)6(OH)2 and Sr10(PO 4)6(OH)2 catalysts, selectively accelerated the dehydration of lactic acid into acrylic acid.

Original languageEnglish
Pages (from-to)192-197
Number of pages6
JournalCatalysis Today
Volume226
DOIs
Publication statusPublished - 2014 May 1

Keywords

  • Acid-base properties
  • Acrylic acid
  • Hydroxyapatite
  • Lactic acid

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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