Synthesis of CuAl hydrotalcite like compound and its ion exchange property

Yamaoka, Tatsurou; Abe, Mitsuo; Tsuji, Masamichi

doi:10.1016/0025-5408(89)90193-1

Cited by 83 publications

(53 citation statements)

References 12 publications

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“…To this solution, 2 g of the CuAl 4 -LDH was added and the suspension stirred at room temperature for 3 h. The yellow product obtained was centrifuged, washed several times with deionized water, twice with ethanol and dried in a dessicator. The resultant product was found to be a composite of Cu 2 O-Al(OH) 3 . One gram of the composite was soaked in 50 mL of 6 M NaOH in a screw capped polypropylene vessel and kept at 65 1C in an air oven for 6 h to leach out the Al(OH) 3 .…”

Section: Reductive Decompositionmentioning

confidence: 99%

“…The resultant product was found to be a composite of Cu 2 O-Al(OH) 3 . One gram of the composite was soaked in 50 mL of 6 M NaOH in a screw capped polypropylene vessel and kept at 65 1C in an air oven for 6 h to leach out the Al(OH) 3 . The residue was filtered through a previously weighed sintered glass crucible and the mass loss monitored.…”

Section: Reductive Decompositionmentioning

confidence: 99%

“…The difficulties seen in obtaining phase-pure Cu-Al LDHs may be related to the instability of Cu(OH) 2 . In recent years, many attempts have been made to synthesize phase-pure Cu-Al LDHs [3][4][5][6][7] and in only a few cases has this been achieved [5]. In most studies, malachite [Cu 2 (OH) 2 (CO 3 )], gibbsite and gehrardtite [Cu 2 (OH) 3 (NO 3 )], were also obtained as impurity phases.…”

Section: Introductionmentioning

confidence: 99%

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Thermal, solution and reductive decomposition of Cu–Al layered double hydroxides into oxide products

Britto

Kamath

2009

Journal of Solid State Chemistry

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a b s t r a c tCu-Al layered double hydroxides (LDHs) with [Cu]/[Al] ratio 2 adopt a structure with monoclinic symmetry while that with the ratio 0.25 adopt a structure with orthorhombic symmetry. The poor thermodynamic stability of the Cu-Al LDHs is due in part to the low enthalpies of formation of Cu(OH) 2 and CuCO 3 and in part to the higher solubility of the LDH. Consequently, the Cu-Al LDH can be decomposed thermally (150 1C), hydrothermally (150 1C) and reductively (ascorbic acid, ambient temperature) to yield a variety of oxide products. Thermal decomposition at low (400 1C) temperature yields an X-ray amorphous residue, which reconstructs back to the LDH on soaking in water or standing in the ambient. Solution decomposition under hydrothermal conditions yields tenorite at 150 1C itself. Reductive decomposition yields a composite of Cu 2 O and Al(OH) 3 , which on alkali-leaching of the latter, leads to the formation of fine particles of Cu 2 O (o1 mm).

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Section: Reductive Decompositionmentioning

confidence: 99%

Section: Reductive Decompositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal, solution and reductive decomposition of Cu–Al layered double hydroxides into oxide products

Britto

Kamath

2009

Journal of Solid State Chemistry

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“…There have been reported Al-rich hydrotalcite-like compounds in the CO32-form with the maximum substitution of R = 0.44 (Pausch et aL, 1986;Thevenot et al, 1989;Tsuji et al, 1993a;Yamaoka et aL, 1989).…”

confidence: 99%

Synthesis and CO₂ Adsorption Features of a Hydrotalcite-Like Compound of the Mg²⁺-Al³⁺-Fe(CN)₆^4- System with High Layer-Charge Density

Mao

1993

Clays and clay miner.

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Abstract--Hydrotalcite-like compounds (HT) with 240/o-48% A13+-substitution have been synthesized in the Mge+-AP+-Fe(CN)64 system. Conditioning of the synthesized and air-dried compound with K4Fe(CN)64 solution at 80~ was essential to obtain the 80O/o-90% pure ionic Fe(CN)64-form on an equivalent basis. A linear decrease in ao with an increase in the mole ratio of R = A13+/(Mg2++A13+ ) was extended to R = 0.48. The formation of highly A13+-substituted HTs has been corroborated by the decrease in the hexagonal lattice constant ao down to 3.016 ~. The ao value was independent of the interlayer anions. The CO2 adsorption profiles were dependent upon both the A13+-substitution and the interlayer distance. The isosteric heat of CO2 adsorption was 43.3 kJ tool t in the range of adsorption of 20 to 40 cm 3 g-' at 298 K and 0.1 MPa.

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“…Yamaoka et al [58] determined an equivalent selectivity sequence for divalent oxoanions (Equation (4)):…”

Section: Direct Anion-exchange Methodsmentioning

confidence: 99%

Mechanochemical Preparation and Structural Characterization of Layered Double Hydroxides and their Amino Acid-Intercalated Derivatives

Ferencz¹

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Synthesis of CuAl hydrotalcite like compound and its ion exchange property

Cited by 83 publications

References 12 publications

Thermal, solution and reductive decomposition of Cu–Al layered double hydroxides into oxide products

Thermal, solution and reductive decomposition of Cu–Al layered double hydroxides into oxide products

Synthesis and CO₂ Adsorption Features of a Hydrotalcite-Like Compound of the Mg²⁺-Al³⁺-Fe(CN)₆^4- System with High Layer-Charge Density

Mechanochemical Preparation and Structural Characterization of Layered Double Hydroxides and their Amino Acid-Intercalated Derivatives

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Synthesis of CuAl hydrotalcite like compound and its ion exchange property

Cited by 83 publications

References 12 publications

Thermal, solution and reductive decomposition of Cu–Al layered double hydroxides into oxide products

Thermal, solution and reductive decomposition of Cu–Al layered double hydroxides into oxide products

Synthesis and CO2 Adsorption Features of a Hydrotalcite-Like Compound of the Mg2+-Al3+-Fe(CN)64- System with High Layer-Charge Density

Mechanochemical Preparation and Structural Characterization of Layered Double Hydroxides and their Amino Acid-Intercalated Derivatives

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Synthesis and CO₂ Adsorption Features of a Hydrotalcite-Like Compound of the Mg²⁺-Al³⁺-Fe(CN)₆^4- System with High Layer-Charge Density