Reaction mechanism of the glycerol hydrogenolysis to 1,3-propanediol over Ir-ReOx/SiO2 catalyst

Yasushi Amada, Yasunori Shinmi, Shuichi Koso, Takeshi Kubota, Yoshinao Nakagawa, Keiichi Tomishige

Research output: Contribution to journalArticle

229 Citations (Scopus)

Abstract

The mechanism of the hydrogenolysis of glycerol to 1,3-propanediol over Ir-ReOx/SiO2 catalyst was discussed. We investigated the catalytic performance, structure, reaction kinetics and reactivity trends of various substrates over the catalysts with different amount of Re. The conversion in the glycerol hydrogenolysis increased with increasing the amount of Re up to Re/Ir=2, and the high selectivity to 1,3-propanediol (ca. 60%) was almost independent of the Re amount. The average size of Ir metal particle gradually decreased with increasing the amount of Re from XRD and TEM. Characterization results such as CO adsorption, TPR, XANES, EXAFS suggested that Ir metal surface was partially covered with ReOx cluster regardless of the Re amount. The reaction order on H2 pressure over Ir-ReOx/SiO2 (Re/Ir=1) was one, suggesting that one active hydrogen species was produced from one hydrogen molecule. Low reaction order on glycerol concentration represented the strong interaction between glycerol and catalyst surface. This catalyst is also applicable to the selective hydrogenolysis of the C-O bond neighboring a -CH2OH group. These reaction trends and characterization results supported the direct reaction mechanism for the formation of 1,3-propanediol from glycerol via 2,3-dihydroxypropoxide species.

Original languageEnglish
Pages (from-to)117-127
Number of pages11
JournalApplied Catalysis B: Environmental
Volume105
Issue number1-2
DOIs
Publication statusPublished - 2011 Jun 9

Keywords

  • 1,3-Propanediol
  • Biomass
  • Hydrogenolysis
  • Iridium
  • Rhenium

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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