title: Structure and surface chemistry in crystalline mesoporous (CeO(2-δ))-YSZ.
abstract: Mesoporous metal oxides (CeO(2-δ))-YSZ have been synthesized by a versatile direct synthesis method using ionic cetyltrimethylammonium bromide (CTAB) and different nonionic (block copolymers) as surfactants and urea as hydrolyzing agent. The synthesis was realized at pH=9 using tetraethylammonium hydroxide (TEAOH) as pH mediator. Calcination at 550 °C led to the formation of crystalline metal oxides with uniform mesoporosity. The obtained materials have been characterized by thermogravimetric analysis (TG-DTG), wide and small-angle X-ray diffraction (XRD), Raman spectroscopy, Brunauer, Emmett and Teller (BET) surface area analysis, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). All the obtained materials exhibits mesoporous structure, crystalline structure indexed in a cubic symmetry, showing a high surface area, a uniform and narrow pore size distribution, spherical morphology typical for the mesoporous materials. The crystalline and mesoporous structures, surface chemistry and stoichiometry for the samples synthesized using ionic and nonionic surfactants have been discussed.
authors.affiliation: Laboratory of Surface Chemistry and Catalysis, Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania. ssimona@icf.ro
authors.forename: Simona
authors.initials: S
authors.lastname: Somacescu
authors.forename: Viorica
authors.initials: V
authors.lastname: Parvulescu
authors.forename: Petre
authors.initials: P
authors.lastname: Osiceanu
authors.forename: Jose Maria
authors.initials: JM
authors.lastname: Calderon-Moreno
authors.forename: Bao-Lian
authors.initials: BL
authors.lastname: Su