Abstract
TPR results show that Pd in PdFe/NaY samples strongly catalyzes the reduction by hydrogen of Fe 3+ to Fe 2+. Mössbauer data demonstrate an interaction of reduced palladium particles with Fe 2+ cations in the zeolite; TPD of hydrogen reveals that this interaction increases with increasing reduction temperature. FT-IR spectra of adsorbed carbon monoxide indicate that Fe cations adhere to the surface of the Pd particles, similar to Ti ions on TiO 2-supported group VIII metals in the SMSI state. After high-temperature reduction, the Pd coordination number derived from EXAFS is lower for PdFe/NaY than for Pd/NaY. It is proposed that Fe cations, which decorate the Pd particles, inhibit the migration of the particles by coulombic interaction with the zeolite lattice.
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