Iridium Complexes and Clusters in Dealuminated Zeolite
HY: Distribution between Crystalline and Impurity Amorphous Regions
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Abstract
Dealuminated zeolite HY was used
to support Ir(CO)<sub>2</sub> complexes
formed from Ir(CO)<sub>2</sub>(C<sub>5</sub>H<sub>7</sub>O<sub>2</sub>). Infrared and X-ray absorption spectra and atomic resolution electron
microscopy images identify these complexes, and the images and <sup>27</sup>Al NMR spectra identify impurity amorphous regions in the
zeolite where the iridium is more susceptible to aggregation than
in the crystalline regions. The results indicate the value of electron
microscopy in characterizing the amorphous impurity regions of zeolites
and a significant stability limitation of metals in these regions
of zeolite catalyst supports
