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Abstract

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Alkali-Free Zn–Al Layered Double Hydroxide Catalysts for Triglyceride Transesterification

“…Reconstruction of calcined Al 3+ containing LDHs depends on the dissolution of M 2+ cations into the amorphous AlO x phase formed on calcination [35]. Zn-Al-LDHs are consequently more challenging to reconstruct than Mg-Al-LDH analogues [36] due to the different solubility products of Zn(OH) 2 and Mg(OH) 2 relative to Al(OH) 3 and concomitant energetics of ion dissolution-reprecipitation necessary to regenerate the LDH. Kooli et al [37] demonstrated some success in regenerating lamellar structured materials following hydrothermal reconstruction of 300-400 • C calcined Zn-Al mixed oxides, although this has not been extended to alkali-free Zn-Al-LDHs or evaluated in catalytic applications.…”

Synthesis of New Pentacyclo[5.4.0.02,6.03,10.05,9]undecane-8,11-dione (PCU) Cyanosilylated Derivatives Using Sulphated Zirconia and Hydrotalcite as Catalysts in Microwave-Assisted Reactions under Solvent Free Conditions

“…Figure 4 shows the diffractogram of the hydrotalcite bearing hexagonal [36,37,38] symmetry corresponding to the symmetric wide basal planes (003), (006) and (009), while the non-basal planes (102), (105) and (108) are asymmetrical.…”

Ceramic nanovector based on layered double hydroxide: attributes, physiologically relevant compositions and surface activation

“…6 and the primary features may be interpreted as follows. [99][100][101] In the control spectrum, the signal at ,3400 cm -1 is due to the OH -group vibration in the Mg-Al-CO 3 (NO 3 ) LDH structure. The interaction between (residual) interlayer H 2 O molecules and the CO 3 2-is reflected by a bridging H 2 O-CO 3 2-mode around 3100 cm -1 , and the presence of a signal at 1620 cm -1 is due to the bending vibration of interlayer water molecules.…”