TY - JOUR
T1 - Comparison of the structural and acid-base properties of Ga- and Al-containing layered double hydroxides obtained by microwave irradiation and conventional ageing of synthesis gels
AU - Tichit, Didier
AU - Rolland, Alice
AU - Prinetto, Federica
AU - Fetter, Geolar
AU - De Jesus Martinez-Ortiz, Maria
AU - Valenzuela, Miguel A.
AU - Bosch, Pedro
PY - 2002/12/1
Y1 - 2002/12/1
N2 - Structural and acid-base properties of Mg/Al and Mg/Ga layered double hydroxides (LDH's) obtained by microwave irradiation of the co-precipitated gels have been investigated and compared to those of samples conventionally aged by prolonged hydrothermal treatment of the gels. Similar crystallinities and chemical compositions were obtained whatever the synthesis method used. Besides, all samples, and remarkably the Ga-containing LDH's with a molar ratio Mg : Ga = 4.5, exhibited pure lamellar phases. The acid-base properties of the mixed oxides obtained by calcination of the LDH's have been examined by microcalorimetric adsorption of CO2 and by FTIR spectroscopy upon CH3CN interaction. These techniques gave evidence that the number and strength of acid and basic sites were influenced by the nature and amount of the trivalent cation, as well as by the preparation method.
AB - Structural and acid-base properties of Mg/Al and Mg/Ga layered double hydroxides (LDH's) obtained by microwave irradiation of the co-precipitated gels have been investigated and compared to those of samples conventionally aged by prolonged hydrothermal treatment of the gels. Similar crystallinities and chemical compositions were obtained whatever the synthesis method used. Besides, all samples, and remarkably the Ga-containing LDH's with a molar ratio Mg : Ga = 4.5, exhibited pure lamellar phases. The acid-base properties of the mixed oxides obtained by calcination of the LDH's have been examined by microcalorimetric adsorption of CO2 and by FTIR spectroscopy upon CH3CN interaction. These techniques gave evidence that the number and strength of acid and basic sites were influenced by the nature and amount of the trivalent cation, as well as by the preparation method.
UR - http://www.scopus.com/inward/record.url?scp=0036931471&partnerID=8YFLogxK
U2 - 10.1039/b203376n
DO - 10.1039/b203376n
M3 - Artículo
SN - 0959-9428
VL - 12
SP - 3832
EP - 3838
JO - Journal of Materials Chemistry
JF - Journal of Materials Chemistry
IS - 12
ER -