Molecular Sieves: From Basic Research to Industrial Applications, pts A and B edition:158 pages:909-916
FTIR characterization of a family of Ir-*BEA zeolites containing different metal loadings (1-5 wt% Ir) was done using pyridine (Py), 2,6-di-tert-butyl-pyridine (DTBP) and quinoline (Qu) like probe molecules in order to determine the nature, and internal and external distribution of acid sites. The catalysts were prepared by incipient wetness impregnation of a *BEA zeolite using iridium acetylacetonate, calcination at 573 K and reduction at 723 K in a now of hydrogen. FTIR characterization indicated that Ir deposition occurred without extended ionic exchange of Ir and without a significant blockage of the pores. Strong Lewis acid sites were present in the calcined catalysts, and large molecules like DTBP penetrated easily inside the pores. FTIR data were correlated with the catalytic behavior of these zeolites in hydrogenation of a prostaglandin intermediate.