Catalytic Conversion of Biomass Pyrolysis Vapours over Sodium-Based Catalyst; A Study on teh State of Sodium on the Catalyst

T.S. Nguyen, Leonardus Lefferts, K.B. Sai Sankar Gupta, Kulathuiyer Seshan

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

Abstract

In situ upgrading of biomass pyrolysis vapours over Na2CO3/γ-Al2O3 catalysts was studied in a laboratory-scale fixed-bed reactor at 500 °C. Catalytic oil exhibits a significant improvement over its non-catalytic counterpart, such as lower oxygen content (12.3 wt % compared to 42.1 wt %), higher energy density (37.0 compared to 19.0 MJ kg−1) and lower acidity. A study using thermogravimetry–mass spectrometry analysis and 23Na and 1H magic-angle spinning NMR techniques has revealed the formation of a new sodium species in the catalyst, which is responsible for the high catalytic activity. This species is proposed to be formed by the coordination of Na+ ions and the hydroxyl groups on the surface of γ-Al2O3. Regeneration of the catalyst was performed in air at 600 °C and the regenerated material displays lower activity towards deoxygenation than the fresh catalyst. This deactivation is likely attributed to the change in the active sodium species during regeneration.
Original languageEnglish
Pages (from-to)1833-1840
JournalChemCatChem
Volume7
Issue number12
DOIs
Publication statusPublished - 8 Sep 2015

Keywords

  • METIS-311297
  • IR-97397

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