An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites.

An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites. Research Abstract Details 

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An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites. Abstract Text:

Ian J Drake,Yihua Zhang,Mary K Gilles,C N Teris Liu,Ponnusamy Nachimuthu,Rupert C C Perera,Hisanobu Wakita,Alexis T Bell,

Aluminum coordination in the framework of USY and ZSM-5 zeolites containing charge-compensating cations (NH4+, H+, or Cu+) was investigated by Al K-edge EXAFS and XANES. This work was performed using a newly developed in-situ cell designed especially for acquiring soft X-ray absorption data. Both tetrahedrally and octahedrally coordinated Al were observed for hydrated H-USY and H-ZSM-5, in good agreement with 27Al NMR analyses. Upon dehydration, water desorbed from the zeolite, and octahedrally coordinated Al was converted progressively to tetrahedrally coordinated Al. These observations confirmed the hypothesis that the interaction of water with Brønsted acid protons can lead to octahedral coordination of Al without loss of Al from the zeolite lattice. When H+ is replaced with NH4+ or Cu+, charge compensating species that absorb less water, less octahedrally coordinated Al was observed. Analysis of Al K-edge EXAFS data indicates that the Al-O bond distance for tetrahedrally coordinated Al in dehydrated USY and ZSM-5 is 1.67 angstroms. Simulation of k3chi(k) for Cu+ exchanged ZSM-5 leads to an estimated distance between Cu+ and framework Al atoms of 2.79 angstroms.

An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites. Publishing Authors By Initials

IJ Drake,Y Zhang,MK Gilles,CN Teris Liu,P Nachimuthu,RC Perera,H Wakita,AT Bell,

For similar inorganic chemicals: aluminum compounds: aluminum oxide: aluminum silicates: zeolites research abstracts see: inorganic chemicals: aluminum compounds: aluminum oxide: aluminum silicates: zeolites research

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An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: The journal of physical chemistry. B

VOLUME: 110

Page Numbers: 11665-76

Journal Abbreviation:

ISSN: 1520-6106

DAY: 22

MONTH: Jun

YEAR: 2006

An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 101157530

An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites. Keywords Mesh Terms:

KEYWORDS: Zeolites

MESH TERMS: chemistry

Chemical & Substance for Abstract: An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites. Information

Substance Name: Copper

Registry Number: 7440-50-8

Grant and Affiliation Information for An in situ Al K-edge XAS investigation of the local environment of H+- and Cu+-exchanged USY and ZSM-5 zeolites.

AFFILIATION: Department of Chemical Engineering, University of California, Berkeley, California 94720-1462, USA.

Country: United States

AGENCY: United States NHGRI

GRANT: HG01399

ACRONYM: HG

MEDLINETA: J Phys Chem B

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