Role of Pt During Hydrodeoxygenation of Biomass Pyrolysis Vapors over Pt/HBEA

Matthew Yung, Guo Foo, Carsten Sievers

Research output: Contribution to journalArticlepeer-review

19 Scopus Citations

Abstract

1.3 wt% Pt/HBEA and HBEA were studied as catalysts for the hydrodeoxygenation of pine pyrolysis vapors at 500 °C. Both catalysts showed high initial conversion of oxygenated pyrolysis products into aromatic hydrocarbons, while Pt/HBEA showed higher stability in terms of hydrocarbon productivity and deferred breakthrough of oxygenated compounds. Among 1-, 2- and 3-ring aromatic hydrocarbons, Pt/HBEA had a significantly higher selectivity than HBEA towards unalkylated aromatics (e.g., benzene) as compared to the corresponding alkylated aromatics (e.g., toluene and xylene). Additionally, Pt addition to HBEA decreased coke deposition and improved resistance to pore and acid site blockage as determined by TPO, N2 physisorption, and NH3 TPD. The ability of Pt to promote cleavage and hydrogenation of methoxy and methyl groups was observed by increased methane production over Pt/HBEA relative to HBEA. A progressive decrease in the methane production over Pt/HBEA correlated with deactivation in terms of reduced benzene formation, breakthrough of oxygenated products, and increased formation of polynuclear aromatics and their degree of substitution, which indicate coke formation. The increased methane yield and suppressed coke formation with the addition of Pt is attributed to hydrogen spillover, through which hydrogen activated on Pt can subsequently migrate to the HBEA support to reverse the coke-forming hydrogen abstraction reaction.

Original languageAmerican English
Pages (from-to)151-160
Number of pages10
JournalCatalysis Today
Volume302
DOIs
StatePublished - 15 Mar 2018

Bibliographical note

Publisher Copyright:
© 2017 Elsevier B.V.

NREL Publication Number

  • NREL/JA-5100-68330

Keywords

  • aromatic hydrocarbons
  • biomass
  • pyrolysis vapors

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