Dealuminated zeolite HY was used to support Ir(CO)2 complexes formed from Ir(CO)2(C5H7O2). Infrared and X-ray absorption spectra and atomic-resolution electron microscopy images identify these complexes, and the images and 27Al 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 a significant stability limitation of metal in amorphous impurity regions of zeolites.
Revised: February 25, 2015 |
Published: July 8, 2014
Citation
Martinez-Macias C., P. Xu, S. Hwang, J. Lu, C. Chen, N.D. Browning, and B.C. Gates. 2014.Iridium Complexes and Clusters in Dealuminated Zeolite HY: Distribution between Crystalline and Impurity Amorphous Regions.ACS Catalysis 4, no. 8:2662–2666.PNNL-SA-101739.doi:10.1021/cs5006426