β-Cyclodextrin-Calcium Complex Intercalated Hydrotalcites as Efficient Catalyst for Transesterification of Glycerol

Abstract

β-cyclodextrin derivative intercalated MgAl-hydrotalcites (β-CD-Ca/LDH) was synthesized to convert glycerol into high value-added glycerol carbonate(GC) by transesterification of dimethyl carbonate (DMC) and glycerol in this paper. β-cyclodextrin-metal complexes and β-CD-Ca/LDH was characterized by XRD, FT-IR, SEM, XPS and nitrogen adsorption-desorption. The enrichment of organic reactants in the hydrophobic cavity of β-cyclodextrin improved the collision probability of reactants. The intercalation of β-cyclodextrin-calcium complex (β-CD-Ca) increased the pore size and basic strength of catalyst. The experiment results showed that the glycerol conversion was 93.7% and the GC yield was 91.8% catalyzed by β-CD-Ca/LDH when the molar ratio of DMC and glycerol was 3:1, the catalyst dosage was 4 wt.%, the reaction temperature was 75 °C and the reaction time was 100 min while the glycerol conversion was 49.4% and the GC yield was 48.6% catalyzed by MgAl-LDH under the same conditions.

Cyclodextrin Polymer-Loaded Micro-Ceramic Balls for Solid-Phase Extraction of Triazole Pesticides from Water

“…Moreover, the absorption peak of -OH was 3427 cm −1 , the absorption peak of C-H tensile vibration was 2923 cm −1 , the absorption peak of -COO was 1630 cm −1 , and the absorption peak of C-O was 1496 cm −1 , all of them were red-shifted. This might be due to the conjugation of the metal groups in the micro-ceramic spheres with the β-CD polymer, which weakened the chemical bond properties of the original group, thereby reducing the force constant and the absorption frequency (Figure 2B) [34][35][36]. The XRD is presented in Figure 3.…”

Structure and release properties of pyrethroid/sulfobutyl ether β-cyclodextrin intercalated into layered double hydroxide and layered hydroxide salt

“…And also, the insertion of Ca/β-CD complex into LDH did not destroy the crystal structure of LDH. Ca/β-CD-LDH can convert glycerol into glycerol carbonate (GC) by transesterification of dimethyl carbonate (DMC) and glycerol (Liu et al, 2021). And the glycerol conversion and the GC yield were 93.7% and 91.8%, respectively, when the molar ratio of DMC and glycerol was 3:1.…”