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Abstract
MgCuAl layered double hydroxides (LDHs) with a hydrotalcite like structure containing different proportions of Mg2+ and Cu2+ cations have been prepared. Thermogravimetry and X-ray diffraction data indicated that the transformation of LDH into mixed oxides is effective after calcination at 723 K, irrespective of the composition. The acid-base properties of these mixed oxides have been investigated using adsorption microcalorimetry and X-ray photoelectron spectroscopy with NH3 (for acidity) and SO2 (for basicity) as probe molecules. Their catalytic behaviour for the conversion of cyclohexanol has been tested. The acid-base properties and the selectivity of catalysts has been related to their composition.
Introduction Hydrotalcites (LDHs) belong to the class of natural and synthetic anionic clays [ 1 ]. The hydrotalcite structure, with formula Mg 6 Al 2 (OH) 16 CO 3 ·4H 2 O, resembles that of brucite, Mg(OH) 2 . In brucite
methods and introducing different bivalent and trivalent constituting metals makes these materials interesting for scientific research [ 6 ]. LDHs, also known as hydrotalcite-like materials, belong to a large group of anionic clays. Their layered structure
-potassium acetate intercalate complex . J Therm Anal Calorim . 2011 ; 103 : 507 – 513 . 10.1007/s10973-010-0917-3 . 16. Palmer , SJ , Grand , LM , Frost , RL . Thermal analysis of hydrotalcite
Thermal decomposition of SO4 2−-intercalated Mg–Al layered double hydroxide
Elimination behavior of sulfur oxides
representative LDH, occurs in three steps: (i) removal of adsorbed water, (ii) elimination of the interlayer structural water, and (iii) simultaneous dehydroxylation and decarbonation of the hydrotalcite framework [ 3 ]. Mg–Al LDH and Mg–Al oxide can be used as
Thermal stability of stercorite H(NH4)Na(PO4)·4H2O
A cave mineral from Petrogale Cave, Madura, Eucla, Western Australia
, Grand , L-M . Synthesis and thermal analysis of indium-based hydrotalcites of formula Mg 6 In 2 (CO 3 )(OH)16·4H 2 O . J Therm Anal Calorim . 2010 ; 101 : 859 – 863 . 10.1007/s10973-009-0439-z . 10
takovite (Ni 6 Al 2 (OH) 16 CO 3 ·4H 2 O) [ 37 ]. LDHs belong to a great group of natural or synthetic inorganic lamellar compounds, named anionic clays or hydrotalcite-like materials, because of the similarity existing between their structures and
Importance of the interlayer orientation in borate-intercalating layered double hydroxides
A study on thermal decomposition kinetics and mechanism
, F , Vaccari , A . Synthesis and characterization of boron hydrotalcite-like compounds as catalyst for gas-phase transposition of cyclohexanone-oxime . Catal Lett 2002 82 : 59 – 67 10.1023/A:1020535923499 . 6
Introduction Layered double hydroxides (LDHs), also called as hydrotalcites or hydrotalcite-like compounds, have received increasing attention in recent years, because of their wide applications as anion exchangers, adsorbents
Thermal Stability of newberyite Mg(PO3OH)·3H2O
A cave mineral from Skipton Lava Tubes, Victoria, Australia
. Synthesis and thermal analysis of indium-based hydrotalcites of formula Mg 6 In 2 (CO 3 )(OH) 16 ·4H 2 O . J Therm Anal Calorim . 2010 ; 101 : 859 – 863 . 10.1007/s10973-009-0439-z . 21