Towards Stable Catalysts for Aqueous Phase Conversion of Ethylene Glycol for Renewable Hydrogen

Kamila Koichumanova, Anna Kaisa Kristiina Vikla, Dennis de Vlieger, Kulathuiyer Seshan, Barbara Mojet, Leonardus Lefferts

Research output: Contribution to journalArticleAcademicpeer-review

29 Citations (Scopus)

Abstract

Aqueous-phase reforming of ethylene glycol over alumina-supported Pt-based catalysts is reported. Performance of the catalysts is investigated by conducting kinetics and in situ attenuated total reflectance (ATR)-IR spectroscopic analysis. Pt/γ-Al2O3 is unstable under APR conditions (270 °C, 90 bar) and undergoes phase transformation to boehmite [AlO(OH)]. This conversion of alumina is studied in situ by using ATR-IR spectroscopy; transition into boehmite proceeds even at milder conditions (210 °C, 40 bar). Pt/γ-Al2O3 deactivates irreversibly because the Pt surface area decreases owing to an increasing metal particle size and coverage with boehmite. However, Pt supported on boehmite itself shows stable activity. Surprisingly, the rate of formation of hydrogen per Pt surface atom is significantly higher on boehmite compared to an alumina-supported catalyst. This observation seems correlated to both increased concentration of surface OH groups as well as to enhanced oxidation of Pt when comparing Pt/γ-Al2O3 with Pt/AlO(OH).
Original languageEnglish
Pages (from-to)1717-1723
JournalChemSusChem
Volume6
Issue number9
DOIs
Publication statusPublished - 2013

Keywords

  • IR-87247
  • METIS-297557

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