Mechanisms for High Selectivity in the Hydrodeoxygenation of 5-Hydroxymethylfurfural over PtCo Nanocrystals

Jing Luo, Hongseok Yun, Alexander V. Mironenko, Konstantinos Goulas, Jennifer D. Lee, Matteo Monai, Cong Wang, Vassili Vorotnikov, Christopher B. Murray, Dionisios G. Vlachos, Paolo Fornasiero, Raymond J. Gorte

Research output: Contribution to journalArticlepeer-review

Abstract

Carbon-supported, Pt and PtCo nanocrystals (NCs) with controlled size and composition were synthesized and examined for hydrodeoxygenation (HDO) of 5-hydroxymethylfurfural (HMF). Experiments in a continuous flow reactor with 1-propanol solvent, at 120 to 160 °C and 33 bar H2, demonstrated that reaction is sequential on both Pt and PtCo alloys, with 2,5-dimethylfuran (DMF) formed as an intermediate product. However, the reaction of DMF is greatly suppressed on the alloys, such that a Pt3Co2 catalyst achieved DMF yields as high as 98%. XRD and XAS data indicate that the Pt3Co2 catalyst consists of a Pt-rich core and a Co oxide surface monolayer whose structure differs substantially from that of bulk Co oxide. Density functional theory (DFT) calculations reveal that the oxide monolayer interacts weakly with the furan ring to prevent side reactions, including overhydrogenation and ring opening, while providing sites for effective HDO to the desired product, DMF. We demonstrate that control over metal nanoparticle size and composition, along with operating conditions, is crucial to achieving good performance and stability. Implications of this mechanism for other reactions and catalysts are discussed.

Original languageEnglish (US)
Pages (from-to)4095-4104
Number of pages10
JournalACS Catalysis
Volume6
Issue number7
DOIs
StatePublished - Jul 1 2016
Externally publishedYes

Keywords

  • 2,5-dimethyl furan
  • 5-hydroxymethylfurfural
  • bimetallic catalyst
  • hydrodeoxygenation
  • PtCo nanocrystal

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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