Systematic study of Pt metal nanoparticles and pourous support with catalytic performance

FIGUEROA, S. J. A.; BORCHENN, B.; RAMALLO-LÓPEZ, J. M.; REQUEJO, F. G.; CRAIEVICH, A. F.; CHIN, Y.; IGLESIA E.

Campinas, Brasil

Congreso; Reunião Anual de Usuários LNLS; 2007

Laboratório Nacional de Luz Síncrotron

Supported metal clusters are widely used to catalyze chemical reactions, such as methanation, reforming, and partial oxidation [1-3]. The size of these clusters strongly influences the turnover rates and selectivity for structure-sensitive catalytic reactions [4]. For CO2-CH4 and H2O-CH4 reforming and CH4 decomposition reactions, CH4 activation turnover rates increased with decreasing size of noble metals nanoclusters [5], consistent with experimental and theoretical evidence for the higher reactivity of coordinatively unsaturated surface atoms on single crystals [6]. Pt surfaces show higher reactivity for the activation of C-H bonds in CH4 than the other noble metals (Rh, Ru, Ir) for a given cluster size [5]. In this work we studied the changes of the size of porous and particles and electronic properties of Pt nanoclusters using X-ray spectroscopies.