TY - JOUR
T1 - On the mechanism of hydrogen-promoted gold-catalyzed CO oxidation
AU - Quinet, Elodie
AU - Piccolo, Laurent
AU - Morfin, Franck
AU - Avenier, Priscilla
AU - Diehl, Fabrice
AU - Caps, Valerie
AU - Rousset, Jean Luc
N1 - KAUST Repository Item: Exported on 2020-10-01
PY - 2009/12/10
Y1 - 2009/12/10
N2 - The kinetics of CO oxidation, H2 oxidation and preferential CO oxidation (PrOx) over Au/Al2O3 catalysts have been investigated. The catalysts with the smallest particles (∼2 nm) are the most active for all three reactions. As previously observed, the presence of H2 greatly promotes CO oxidation, which becomes faster than CO-free H2 oxidation at low temperature. From these results and on the basis of previous works, we propose a complete PrOx mechanism. The reaction involves Au-OOH, Au-OH and Au-H intermediates, also involved in H2 oxidation, and benefits from the presence of low-coordination sites. © 2009 Elsevier Inc. All rights reserved.
AB - The kinetics of CO oxidation, H2 oxidation and preferential CO oxidation (PrOx) over Au/Al2O3 catalysts have been investigated. The catalysts with the smallest particles (∼2 nm) are the most active for all three reactions. As previously observed, the presence of H2 greatly promotes CO oxidation, which becomes faster than CO-free H2 oxidation at low temperature. From these results and on the basis of previous works, we propose a complete PrOx mechanism. The reaction involves Au-OOH, Au-OH and Au-H intermediates, also involved in H2 oxidation, and benefits from the presence of low-coordination sites. © 2009 Elsevier Inc. All rights reserved.
UR - http://hdl.handle.net/10754/566008
UR - https://linkinghub.elsevier.com/retrieve/pii/S0021951709003236
UR - http://www.scopus.com/inward/record.url?scp=72449142730&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2009.09.019
DO - 10.1016/j.jcat.2009.09.019
M3 - Article
SN - 0021-9517
VL - 268
SP - 384
EP - 389
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 2
ER -