An in situ Al K-edge XAS investigation of the local environment of [H.sup.+]- and [Cu.sup.+]-exchanged USY and ZSM-5 zeolites
Article Abstract:
Aluminum coordination in the framework of USY and ZSM-5 zeolites containing charge-compensating cations {N[H.sub.4][.sup.+], [H.sup.+], or [Cu.sup.+]} was investigated by Al K-edge EXAFS and X-ray absorption near edge spectroscopy (XANES). Al K-edge XANES of hydrated H-USY and H-ZSM-5 showed evidence for both tetrahedrally and octahedrally coordinated Al and EXAFS data indicated that the Al-O bond distance for tetrahedrally coordinated Al in dehydrated USY and ZSM-5 as 1.67 Angstrom.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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Electronic structures of crystalline and aqueous solutions of LiBr, NaBr, KBr, and KBrO3: In situ Br L-edge near-edge X-ray absorption fine structure
Article Abstract:
A study done on the electronic structures of crystalline and aqueous solutions of LiBr, NaBr, KBr, and KBrO3 using in-situ Br L-edge near edge X-ray absorption fine structure (NEXAFS) under ambient conditions is reported. Discrete variational-X(alpha) (DV-X(alpha)) molecular-orbital calculations are carried out for the Br L3-edge NEXAFS of crystalline KBr and aqueous solution.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
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Near-edge X-ray absorption fine structure study of disordering in Gd2[Ti(sub1-y)Zr(sub y)](sub 2)O7 pyrochlores
Article Abstract:
A study investigates disorder in Gd2[Ti(sub1-y)Zr(sub y)](sub 2)O(sub 7) pyrochlores, for y = 0.0-1.0, by Ti 2p and O 1s near-edge X-ray absorption fine structure spectroscopy. Ti(super 4+) ions are found to occupy octahedral sites in Gd2Ti2O7 with a tetragonal distortion induced by vacant oxygen sites.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
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