title: High Thermal Stability of La2O3- and CeO2-Stabilized Tetragonal ZrO2.
abstract: Catalyst support materials of tetragonal ZrO2, stabilized by either La2O3 (La2O3-ZrO2) or CeO2 (CeO2-ZrO2), were synthesized under hydrothermal conditions at 200 °C with NH4OH or tetramethylammonium hydroxide as the mineralizer. From in situ synchrotron powder X-ray diffraction and small-angle X-ray scattering measurements, the calcined La2O3-ZrO2 and CeO2-ZrO2 supports were nonporous nanocrystallites that exhibited rectangular shapes with a thermal stability of up to 1000 °C in air. These supports had an average size of ∼ 10 nm and a surface area of 59-97 m(2)/g. The catalysts Pt/La2O3-ZrO2 and Pt/CeO2-ZrO2 were prepared by using atomic layer deposition with varying Pt loadings from 6.3 to 12.4 wt %. Monodispersed Pt nanoparticles of ∼ 3 nm were obtained for these catalysts. The incorporation of La2O3 and CeO2 into the t-ZrO2 structure did not affect the nature of the active sites for the Pt/ZrO2 catalysts for the water-gas shift reaction.
authors.affiliation: Center for Catalysis and Surface Science, Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
authors.forename: Shichao
authors.initials: S
authors.lastname: Wang
authors.affiliation: Center for Catalysis and Surface Science, Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
authors.forename: Hong
authors.initials: H
authors.lastname: Xie
authors.affiliation: Center for Catalysis and Surface Science, Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
authors.forename: Yuyuan
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Center for Catalysis and Surface Science, Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States.
authors.forename: Kenneth R
authors.initials: KR
authors.lastname: Poeppelmeier
authors.affiliation: X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Tao
authors.initials: T
authors.lastname: Li
authors.affiliation: X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Randall E
authors.initials: RE
authors.lastname: Winans
authors.affiliation: School of Chemical Engineering, Purdue University , 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States.
authors.forename: Yanran
authors.initials: Y
authors.lastname: Cui
authors.affiliation: School of Chemical Engineering, Purdue University , 480 Stadium Mall Drive, West Lafayette, Indiana 47907, United States.
authors.forename: Fabio H
authors.initials: FH
authors.lastname: Ribeiro
authors.affiliation: Energy Systems Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Christian P
authors.initials: CP
authors.lastname: Canlas
authors.affiliation: Energy Systems Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Jeffrey W
authors.initials: JW
authors.lastname: Elam
authors.affiliation: Chemical Sciences and Engineering Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zhang
authors.affiliation: Chemical Sciences and Engineering Division, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Christopher L
authors.initials: CL
authors.lastname: Marshall