TY - JOUR
T1 - Effect of the metal deposition order on structural, electronic and catalytic properties of tio2-supported bimetallic au-ag catalysts in 1-octanol selective oxidation
AU - Kotolevich, Yulia
AU - Pakrieva, Ekaterina
AU - Kolobova, Ekaterina
AU - Farías, Mario H.
AU - Bogdanchikova, Nina
AU - Cortés Corberán, Vicente
AU - Pichugina, Daria
AU - Nikitina, Nadezhda
AU - Carabineiro, Sónia A. C.
AU - Pestryakov, Alexey
N1 - info:eu-repo/grantAgreement/FCT/CEEC INST 2018/6885/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/157669/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/157968/PT#
42-01-09/169/2021-4
CTQ2017-86170-R
PY - 2021/7
Y1 - 2021/7
N2 - Au and Ag were deposited on TiO2 modified with Ce, La, Fe or Mg in order to obtain bimetallic catalysts to be used for liquid-phase oxidation of 1-octanol. The effects of the deposition order of gold and silver, and the nature of the support modifying additives and redox pretreatments on the catalytic properties of the bimetallic Au-Ag catalysts were studied. Catalysts were characterized by low-temperature nitrogen adsorption–desorption, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and ultraviolet-visible diffuse reflectance spectroscopy. It was found that pretreatments with hydrogen and oxygen at 300◦C significantly decreased the activity of AuAg catalysts (silver was deposited first) and had little effect on the catalytic properties of AgAu samples (gold was deposited first). The density functional theory method demonstrated that the adsorption energy of 1-octanol increased for all positively charged AuxAgyq (x + y = 10, with a charge of q = 0 or +1) clusters compared with the neutral counterparts. Lanthanum oxide was a very effective promoter for both monometallic and bimetallic gold and silver catalysts in the studied process.
AB - Au and Ag were deposited on TiO2 modified with Ce, La, Fe or Mg in order to obtain bimetallic catalysts to be used for liquid-phase oxidation of 1-octanol. The effects of the deposition order of gold and silver, and the nature of the support modifying additives and redox pretreatments on the catalytic properties of the bimetallic Au-Ag catalysts were studied. Catalysts were characterized by low-temperature nitrogen adsorption–desorption, energy dispersive spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy and ultraviolet-visible diffuse reflectance spectroscopy. It was found that pretreatments with hydrogen and oxygen at 300◦C significantly decreased the activity of AuAg catalysts (silver was deposited first) and had little effect on the catalytic properties of AgAu samples (gold was deposited first). The density functional theory method demonstrated that the adsorption energy of 1-octanol increased for all positively charged AuxAgyq (x + y = 10, with a charge of q = 0 or +1) clusters compared with the neutral counterparts. Lanthanum oxide was a very effective promoter for both monometallic and bimetallic gold and silver catalysts in the studied process.
KW - 1-octanol oxidation
KW - Bimetallic catalysts
KW - Gold
KW - Silver
UR - http://www.scopus.com/inward/record.url?scp=85108880818&partnerID=8YFLogxK
U2 - 10.3390/catal11070799
DO - 10.3390/catal11070799
M3 - Article
AN - SCOPUS:85108880818
SN - 2073-4344
VL - 11
JO - Catalysts
JF - Catalysts
IS - 7
M1 - 799
ER -