Solid-State NMR Detection, Characterization, and Quantification of the Multiple Aluminum Environments in US-Y Catalysts by Al-27 MAS and MQMAS Experiments at Very High Field

Journal Article · Wed Jun 06 04:00:00 EDT 2001 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja003210k· OSTI ID:15004159

Fyfe, Colin A ^[1]; Bretherton, Jeremy L ^[1]; Lam, Lau Y ^[2]

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1. 8998
2. University of British Columbia

The detection of all of the aluminum present in steamed zeolite H-Y catalysts by (27)Al MAS NMR at 14.4 T (600 MHz for (1)H) and 18.8T (800 MHz for (1)H) is reported. Further, it is shown that it is possible by (27)Al MAS and MQMAS NMR measurements to clearly identify four separate aluminum environments which are characteristic of these materials and to unambiguously assign their coordinations. Average chemical shift and quadrupolar coupling parameters are used to accurately simulate the (27)Al MAS NMR spectra at 9.4 T (400 MHz for (1)H), 14.4 T (600 MHz for (1)H) and 18.8 T (800 MHz for (1)H) in terms of these four aluminum environments. In addition, these average chemical shift and quadrupolar coupling parameters are used to calculate peak positions in the (27)Al MQMAS isotropic dimension that are in good agreement with the experimental data acquired at 9.4 and 18.8 T.

• Research Organization: Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Lab. (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 15004159
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 22 Vol. 123; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALUMINIUM
CATALYSTS
CHEMICAL SHIFT
DETECTION
DIMENSIONS
ENVIRONMENTAL MOLECULAR SCIENCES LABORATORY
NULL
NMR SPECTRA
ZEOLITES