In situ ATR-IR studies in aqueous phase reforming of hydroxyacetone on Pt/ZrO2 and Pt/AlO(OH) catalysts: The role of aldol condensation

Kamila Koichumanova, Anna Kaisa K. Vikla, Remedios Cortese, Francesco Ferrante, K. Seshan, Dario Duca, Leon Lefferts* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

In situ Attenuated Total Reflection Infrared (ATR-IR) spectroscopy was used to study Aqueous Phase Reforming of hydroxyacetone on Pt/AlO(OH) and Pt/ZrO2 catalysts at 230 °C/ 30 bar. Formation of strongly adsorbed aldol condensation products was observed on the surface of Pt/ZrO2 and ZrO2 in contrast to Pt/AlO(OH) and AlO(OH). Peak assignments were supported by DFT calculations of the IR spectra of the condensation products in vacuum and in the presence of water. Aldol condensation of hydroxyacetone leading to compounds with high molecular weight with unsaturated bonds was suggested as a first step in coke formation. Carbonaceous deposits on the surface of the ZrO2 support are oxygen-rich and highly reactive, according elemental analysis and TPO. Surprisingly, no adsorbed CO on Pt was observed in the spectra obtained under reaction conditions, suggesting that adsorbed CO is not involved in the rate-determining step in APR of hydroxyacetone.

Original languageEnglish
Pages (from-to)454-463
Number of pages10
JournalApplied catalysis B: environmental
Volume232
DOIs
Publication statusPublished - 15 Sep 2018

Keywords

  • UT-Hybrid-D
  • Aqueous phase reforming
  • ATR-IR spectroscopy
  • In situ
  • Liquid phase
  • Aldol condensation

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