MgCoAl and NiCoAl LDHs synthesized by the hydrothermal urea hydrolysis method: Structural characterization and thermal decomposition

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.12.062· OSTI ID:22475732

De Carvalho, G. S.G.; Do Carmo, W. R. ^[1]; San Gil, R. A.S. ^[2]; Chiaro, S. S.X. ^[3]; Leitão, A. A.; Diniz, R. ^[1]; De Sena, L. A.; Achete, C. A. ^[4]

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1. Universidade Federal de Juiz de Fora, Departamento de Química, Grupo de Físico-Química de Sólidos e Interfaces, 36036-330 Juiz de Fora, MG (Brazil)
2. Universidade Federal do Rio de Janeiro, Instituto de Química, 21949-900 Rio de Janeiro, RJ (Brazil)
3. PETROBRAS-CENPES, 21941-915 Rio de Janeiro, RJ (Brazil)
4. Instituto Nacional de Metrologia Qualidade e Tecnologia, Divisão de Metrologia de Materiais, 25250-020 Duque de Caxias, RJ (Brazil)

Highlights: • We synthesized MgCoAl and NiCoAl LDHs by the urea hydrolysis method. • Aluminum rich and crystalline materials have been formed. • The calcination of the LDHs generated mixed oxides with high surface areas. - Abstract: Layered double hydroxides (LDHs) with Mg/Co/Al and Ni/Co/Al were synthesized for the first time by the urea hydrolysis method. The experimental conditions promoted aluminum rich and crystalline materials. The formation of LDHs was investigated by powder X-ray diffraction (XRD), chemical analysis, solid state nuclear magnetic resonance with magic angle spinning ({sup 27}Al-MAS-NMR), simultaneous thermogravimetric/differential thermal analysis (TGA/DTA), FTIR spectroscopy, scanning electron microscopy (SEM), and N{sub 2} adsorption–desorption experiments. A single phase corresponding to LDH could be obtained in all the investigated compositions. Thermal calcination of these LDHs at 500 °C resulted in the formation of solid solutions in which Al{sup 3+} was dissolved. All the calcined materials have rock-salt like structures and high surface areas.

• OSTI ID: 22475732
• Journal Information: Materials Research Bulletin, Vol. 64; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
ALUMINIUM COMPOUNDS
COBALT COMPOUNDS
DESORPTION
DIFFERENTIAL THERMAL ANALYSIS
FOURIER TRANSFORMATION
HYDROLYSIS
INFRARED SPECTRA
MAGNESIUM COMPOUNDS
NICKEL COMPOUNDS
NUCLEAR MAGNETIC RESONANCE
OXIDES
SCANNING ELECTRON MICROSCOPY
SOLID SOLUTIONS
SPECTROSCOPY
TERNARY ALLOY SYSTEMS
THERMAL GRAVIMETRIC ANALYSIS
UREA
X-RAY DIFFRACTION