High-Resolution Al-27 NMR-Study of Calcium Aluminate Catalysts Full article
Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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Output data | Year: 1986, Volume: 27, Number: 6, Pages: 1231-1237 Pages count : 7 | ||||||
Tags | CALCIUM COMPOUNDS - Spectrum Analysis; NUCLEAR MAGNETIC RESONANCE - Applications | ||||||
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Abstract:
The high-resolution 27Al NMR spectra of calcium aluminates, calcium hydroaluminates, and calcium alumina supports and catalysts have been studied. The structures of the anhydrous calcium aluminates (CaAl2O3, CaAl4O7, 3CaO multiplied by (times) Al2O3, 12CaO multiplied by (times) 7Al2O3, talyum) consist of aluminum-oxygen tetrahedra and contain various types of aluminum atoms, the nonequivalence of which increases in going from strongly basic to weakly basic aluminates. In the NMR spectrum the signal of octahedrally coordinated aluminum is due to disordered aluminum-oxygen structures. During the forming of the calcium-alumina catalysts and supports the process left bracket AlO4 right bracket yields left bracket AlO6 right bracket takes place during hydration, and left bracket AlO6 right bracket yields left bracket AlO4 right bracket during thermolysis; the nonequivalence of the tetrahedrally coordinated aluminum atoms decreases, while the left bracket AlO4 right bracket : left bracket AlO6 right bracket ratio decreases as the degree of hydration increases.
Cite:
Yakerson V.I.
, Nissenbaum V.D.
, Golosman E.Z.
, Mastikhin V.M.
High-Resolution Al-27 NMR-Study of Calcium Aluminate Catalysts
Kinetics and Catalysis. 1986. V.27. N6. P.1231-1237. WOS Scopus РИНЦ
High-Resolution Al-27 NMR-Study of Calcium Aluminate Catalysts
Kinetics and Catalysis. 1986. V.27. N6. P.1231-1237. WOS Scopus РИНЦ
Original:
Якерсон В.И.
, Ниссенбаум В.Д.
, Голосман Е.З.
, Мастихин В.М.
Исследование катализаторов на основе алюминатов кальция методом ЯМР 27Al высокого разрешения
Кинетика и катализ. 1986. Т.27. №6. С.1419-1426. РИНЦ
Исследование катализаторов на основе алюминатов кальция методом ЯМР 27Al высокого разрешения
Кинетика и катализ. 1986. Т.27. №6. С.1419-1426. РИНЦ
Dates:
Submitted: | Jan 22, 1986 |
Published print: | Nov 1, 1986 |
Identifiers:
Web of science | WOS:A1986J284600005 |
Scopus | 2-s2.0-0022818904 |
Elibrary | 30603173 |