skip to main content

SciTech ConnectSciTech Connect

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

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.
Authors:
 [1] ;  [2] ; ;  [1] ;  [3] ;  [4] ; ;  [1] ; ;  [5]
  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. (Brazil)
  3. Universidade Federal do Rio de Janeiro, Instituto de Química, 21949-900 Rio de Janeiro, RJ (Brazil)
  4. PETROBRAS-CENPES, 21941-915 Rio de Janeiro, RJ (Brazil)
  5. Instituto Nacional de Metrologia Qualidade e Tecnologia, Divisão de Metrologia de Materiais, 25250-020 Duque de Caxias, RJ (Brazil)
Publication Date:
OSTI Identifier:
22475732
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 64; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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