Base-free selective oxidation of glycerol with 3% H2O2 catalyzed by sulphonato-salen-chromium(III) intercalated LDH

Base-Free Selective Oxidation of Glycerol over LDH Hosted Transition Metal Complexes Using 3% H2O2 as Oxidant

“…Under the optimal reaction conditions (10 mmol GLY, 0.2 g catalyst, 30 mL 3% H2O2, 6 h and 60 °C), the best GLY conversion and DHA selectivity reached 85.0% and 56.5%, respectively. The present reaction results were better than the best results in the bibliography under the solvent and base-free conditions (GLY conversion of 71.3% and DHA selectivity of 43.5% reported by us previously [17]). The reusability of heterogenized catalyst is another important performance evaluation index with the exception of its catalytic activity.…”

“…This indicated that the catalytic performance of LDH-hosted complexes was probably related to their H 2 O 2 efficiency. In our previous report, we found that O 2 could not oxidize GLY in the presence of an LDH-hosted complex and base-free reaction conditions, and the disproportionation decomposition of H 2 O 2 to O 2 was unproductive for GLY oxidation [17]. Thus, the remarkably low catalytic performance of LDH-[Mn(SO 3 -salphen)] and LDH-[Fe(SO 3 -salphen)] could be related to their especially high activities to the disproportionation decomposition of H 2 O 2 .…”

“…LDHs were often considered as catalysts or catalyst supports owing to their adjustable surface basicity, high surface and thermal stability, along with the adjustable variability of their laminate cations, and the exchangeability of their interlayer anions [21][22][23][24]. In our previous report, we prepared an LDH-hosted chromium complex, which was an active catalyst for the oxidation reaction of GLY to DHA with 3% H2O2 [17]. However, the structure-performance relationship of the catalyst was unclear.…”

“…However, due to the high cost and easy catalyst deactivation of noble metal catalysts, the design of efficient transition metal catalysts was becoming a hot point in the current research area [1,[13][14][15][16][17][18][19][20]. Zhou et al reported that Cu-containing hydrotalcites were active catalysts in the selective oxidation of GLY to glyceric acid, and the highest yield reached 68% [1].…”

“…In our previous report, we prepared an LDH-hosted chromium complex, which was an active catalyst for the oxidation reaction of GLY to DHA with 3% H 2 O 2 [17]. However, the structure-performance relationship of the catalyst was unclear.…”