Research output: Contribution to journal › Article › peer-review
Pt/CeO 2 and Pt/CeSnO x catalysts for low-temperature CO oxidation prepared by plasma-arc technique. / Kardash, Tatyana Y.; Derevyannikova, Elizaveta A.; Slavinskaya, Elena M. et al.
In: Frontiers in Chemistry, Vol. 7, No. MAR, 114, 12.03.2019, p. 114.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Pt/CeO 2 and Pt/CeSnO x catalysts for low-temperature CO oxidation prepared by plasma-arc technique
AU - Kardash, Tatyana Y.
AU - Derevyannikova, Elizaveta A.
AU - Slavinskaya, Elena M.
AU - Stadnichenko, Andrey I.
AU - Maltsev, Vasiliy A.
AU - Zaikovskii, Alexey V.
AU - Novopashin, Sergey A.
AU - Boronin, Andrei I.
AU - Neyman, Konstantin M.
PY - 2019/3/12
Y1 - 2019/3/12
N2 - We applied a method of plasma arc synthesis to study effects of modification of the fluorite phase of ceria by tin ions. By sputtering active components (Pt, Ce, Sn) together with carbon from a graphite electrode in a helium ambient we prepared samples of complex highly defective composite PtCeC and PtCeSnC oxide particles stabilized in a matrix of carbon. Subsequent high-temperature annealing of the samples in oxygen removes the carbon matrix and causes the formation of active catalysts Pt/CeO x and Pt/CeSnO x for CO oxidation. In the presence of Sn, X-Ray Diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HRTEM) show formation of a mixed phase CeSnO x and stabilization of more dispersed species with a fluorite-type structure. These factors are essential for the observed high activity and thermic stability of the catalyst modified by Sn. X-Ray Photoelectron Spectroscopy (XPS) reveals the presence of both Pt 2+ and Pt 4+ ions in the catalyst Pt/CeO x , whereas only the state Pt2+ of platinum could be detected in the Sn-modified catalyst Pt/CeSnO x . Insertion of Sn ions into the Pt/CeO x lattice destabilizes/reduces Pt 4+ cations in the Pt/CeSnO x catalyst and induces formation of strikingly high concentration (up to 50% at.) of lattice Ce 3+ ions. Our DFT calculations corroborate destabilization of Pt 4+ ions by incorporation of cationic Sn in Pt/CeO x . The presented results show that modification of the fluorite lattice of ceria by tin induces substantial amount of mobile reactive oxygen partly due to affecting geometric parameters of ceria by tin ions.
AB - We applied a method of plasma arc synthesis to study effects of modification of the fluorite phase of ceria by tin ions. By sputtering active components (Pt, Ce, Sn) together with carbon from a graphite electrode in a helium ambient we prepared samples of complex highly defective composite PtCeC and PtCeSnC oxide particles stabilized in a matrix of carbon. Subsequent high-temperature annealing of the samples in oxygen removes the carbon matrix and causes the formation of active catalysts Pt/CeO x and Pt/CeSnO x for CO oxidation. In the presence of Sn, X-Ray Diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HRTEM) show formation of a mixed phase CeSnO x and stabilization of more dispersed species with a fluorite-type structure. These factors are essential for the observed high activity and thermic stability of the catalyst modified by Sn. X-Ray Photoelectron Spectroscopy (XPS) reveals the presence of both Pt 2+ and Pt 4+ ions in the catalyst Pt/CeO x , whereas only the state Pt2+ of platinum could be detected in the Sn-modified catalyst Pt/CeSnO x . Insertion of Sn ions into the Pt/CeO x lattice destabilizes/reduces Pt 4+ cations in the Pt/CeSnO x catalyst and induces formation of strikingly high concentration (up to 50% at.) of lattice Ce 3+ ions. Our DFT calculations corroborate destabilization of Pt 4+ ions by incorporation of cationic Sn in Pt/CeO x . The presented results show that modification of the fluorite lattice of ceria by tin induces substantial amount of mobile reactive oxygen partly due to affecting geometric parameters of ceria by tin ions.
KW - Ceria
KW - CO oxidation
KW - DFT calculations
KW - Plasma arc synthesis
KW - Platinum
KW - Pt/CeO catalyst
KW - Tin
KW - THERMAL-STABILITY
KW - COMBUSTION
KW - PLATINUM
KW - Pt/CeO2 catalyst
KW - ceria
KW - LASER-ABLATED NANOPARTICLES
KW - platinum
KW - PD/CEO2 CATALYSTS
KW - SOLID-SOLUTION
KW - CERIA
KW - tin
KW - REDOX
KW - plasma arc synthesis
KW - CEO2
KW - PHOTOELECTRON-SPECTROSCOPY
UR - http://www.scopus.com/inward/record.url?scp=85064616810&partnerID=8YFLogxK
U2 - 10.3389/fchem.2019.00114
DO - 10.3389/fchem.2019.00114
M3 - Article
C2 - 30931295
AN - SCOPUS:85064616810
VL - 7
SP - 114
JO - Frontiers in Chemistry
JF - Frontiers in Chemistry
SN - 2296-2646
IS - MAR
M1 - 114
ER -
ID: 19646794