Microwave-treated layered double hydroxides containing Ni{sup 2+} and Al{sup 3+}: The effect of added Zn{sup 2+}

Journal Article · Fri Dec 15 00:00:00 EST 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.08.010· OSTI ID:20900920

Benito, P ^[1]; Labajos, F M ^[1]; Rives, V ^[1]

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1. Departamento de Quimica Inorganica, Universidad de Salamanca, Salamanca-37008 (Spain)

Ni containing layered double hydroxides (LDHs) have been prepared by precipitation and hydrothermally treated under microwave irradiation for different periods of time. The solids have been calcined at three temperatures corresponding to stable phases formed during thermal decomposition of LDHs. The properties of the irradiated samples and of the calcined products were studied in order to ascertain whether the ageing treatment under microwave irradiation modifies not only the properties of the layered materials, but also the properties of the calcined products. A structural and textural study was carried out by PXRD, FT-IR and Vis-UV spectroscopy, thermal analyses (DTA and TG), N{sub 2} adsorption/desorption at -196 {sup o}C and TEM microscopy; the reducibility of the nickel species was studied as well by TPR. The results show that the microwave treatment leads to better crystallized LDHs with modified thermal stability and reducibility. In addition, the degree of crystallinity of the layered precursors and their textural properties determine the properties of their thermal decomposition products. - Graphical abstract: Layered double hydroxides were prepared by the microwave-hydrothermal treatment. This method allows obtaining in short periods of time well crystallized LDHs with well-defined hexagonal-shaped particles, and improved thermal stability and the textural properties. In addition, the degree of crystallinity of the layered precursors and their textural properties determine the properties of t thermal decomposition products.

• OSTI ID: 20900920
• Journal Information: Journal of Solid State Chemistry, Vol. 179, Issue 12; Other Information: DOI: 10.1016/j.jssc.2006.08.010; PII: S0022-4596(06)00468-3; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
ALUMINIUM HYDROXIDES
ALUMINIUM IONS
CALCINATION
DESORPTION
DIFFERENTIAL THERMAL ANALYSIS
FOURIER TRANSFORMATION
INFRARED SPECTRA
IRRADIATION
LAYERS
MICROSCOPY
MICROWAVE RADIATION
NICKEL HYDROXIDES
NICKEL IONS
PRECIPITATION
SPECTROSCOPY
TEMPERATURE RANGE 0400-1000 K
X-RAY DIFFRACTION
ZINC HYDROXIDES
ZINC IONS