TY - JOUR
T1 - In situ ATR-IR studies in aqueous phase reforming of hydroxyacetone on Pt/ZrO2 and Pt/AlO(OH) catalysts
T2 - The role of aldol condensation
AU - Koichumanova, Kamila
AU - Vikla, Anna Kaisa K.
AU - Cortese, Remedios
AU - Ferrante, Francesco
AU - Seshan, K.
AU - Duca, Dario
AU - Lefferts, Leon
N1 - Elsevier deal
PY - 2018/9/15
Y1 - 2018/9/15
N2 - 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.
AB - 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.
KW - UT-Hybrid-D
KW - Aqueous phase reforming
KW - ATR-IR spectroscopy
KW - In situ
KW - Liquid phase
KW - Aldol condensation
U2 - 10.1016/j.apcatb.2018.03.090
DO - 10.1016/j.apcatb.2018.03.090
M3 - Article
AN - SCOPUS:85044612762
VL - 232
SP - 454
EP - 463
JO - Applied catalysis B: environmental
JF - Applied catalysis B: environmental
SN - 0926-3373
ER -