6533b823fe1ef96bd127f6d4

RESEARCH PRODUCT

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

Kulathuiyer SeshanFrancesco FerranteAnna Kaisa Kristiina ViklaKamila KoichumanovaLeon LeffertsRemedios CorteseDario Duca

subject

UT-Hybrid-DInfrared spectroscopyAqueous phase reforming02 engineering and technology010402 general chemistryPhotochemistry01 natural sciencesCatalysisCatalysiIn situLiquid phaseCatalysischemistry.chemical_compoundAdsorptionGeneral Environmental ScienceATR-IR spectroscopy2300Process Chemistry and TechnologyHydroxyacetoneCondensationAqueous two-phase system021001 nanoscience & nanotechnology0104 chemical sciencesAldol condensationchemistryAttenuated total reflectionAldol condensation0210 nano-technology

description

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.

yearjournalcountryeditionlanguage
2018-09-15Applied Catalysis B: Environmental
https://doi.org/10.1016/j.apcatb.2018.03.090