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Published August 2014 | Version Supplemental Material
Journal Article Open

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)_2 complexes formed from Ir(CO)_2(C_5H_7O_2). Infrared and X-ray absorption spectra and atomic resolution electron microscopy images identify these complexes, and the images and ^(27)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.

Additional Information

© 2014 American Chemical Society. Received: May 9, 2014. Revised: June 29, 2014. Publication Date (Web): July 8, 2014. This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Grants DEFG02-04ER15513 (C.M.M.) and DE-FG02-03ER46057 (P.X.) through the University of California, Davis; the Laboratory Directed Research and Development Program: Chemical Imaging Initiative, at Pacific Northwest National Laboratory (PNNL); and the Environmental Molecular Sciences Laboratory, a national scientific user facility sponsored by the DOE's Office of Biological and Environmental Research and located at PNNL, a multiprogram national laboratory operated by Battelle for DOE under Contract DE-AC05-76RL01830. C.M.M. was supported in part by the UC MEXUS-CONACYT doctoral fellowship program. Use of the Advanced Photon Source, an Office of Science User Facility operated for DOE by Argonne National Laboratory, was supported by Contract No. DEAC02-06CH11357. We thank the beamline staff of the MRCAT. The NMR facility at Caltech was supported by the National Science Foundation (NSF) Grant 9724240 and supported in part by the NSF MRSEC Program Award DMR-520565.

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Identifiers

Eprint ID
49285
Resolver ID
CaltechAUTHORS:20140905-110448206

Related works

Describes
http://pubs.acs.org/doi/suppl/10.1021/cs5006426 (URL)

Funding

Department of Energy (DOE)
DEFG02-04ER15513
Department of Energy (DOE)
DE-FG02-03ER46057
University of California, Davis
Pacific Northwest National Laboratory
Department of Energy (DOE)
DE-AC05-76RL01830
UC MEXUS-CONACYT doctoral fellowship program
Department of Energy (DOE)
DE-AC02-06CH11357
NSF
DMR-9724240
NSF
DMR-520565

Dates

Created
2014-09-05
Created from EPrint's datestamp field
Updated
2021-11-10
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