Rebeca Bacani

Structural studies of mesoporous ZrO2-CeO2 and ZrO2-CeO2/SiO2 mixed oxides for catalytical applications

In this work the synthesis of ZrO2-CeO2 and ZrO2-CeO2/SiO2 were developed, based on the process to form ordered mesoporous materials such as SBA-15 silica. The triblock copolymer Pluronic P-123 was used as template, aiming to obtain crystalline single phase walls and larger specific surface area, for future applications in catalysis. SAXS and XRD results showed a relationship between ordered pores and the material crystallization. 90% of CeO2 leaded to single phase homogeneous ceria-zirconia solid solution of cubic fluorite structure (Fm3¯ m). The SiO2 addition improved structural and textural properties as well as the reduction behavior at lower temperatures, investigated by XANES measurements under H2 atmosphere.

XANES studies of zirconia-ceria/Ni during partial/total methane oxidation

1 Universidade de São Paulo, Departamento de Física Aplicada, São Paulo, Brazil, 2 Universidade Federal de São Paulo, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Diadema, Brasil, 3 Centro de Investigaciones en Sólidos, CINSO-UNIDEF-CONICET, Buenos Aires, Argentina, 4 Universidad Nacional del Comahue, Laboratório de Caracterización de Materiales, Facultad de Ingeniería, Neuquén, Argentina