Abstract
A series of layered double hydroxides (LDHs) –hosted sulphonato-salen Cr(III) complexes were prepared and characterized by various physico-chemical measurements, such as Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), powder X-ray diffraction (XRD), transmission electron microscope (TEM), scanning electron microscope (SEM) and elemental analysis. Additionally, their catalytic performances were investigated in the selective oxidation of glycerol (GLY) using 3% H2O2 as an oxidant. It was found that all the LDH-hosted Cr(III) complexes exhibited significantly enhanced catalytic performance compared to the homogeneous Cr(III) complex. Additionally, it was worth mentioning that the metal composition of LDH plates played an important role in the catalytic performances of LDH-hosted Cr(III) complex catalysts. Under the optimal reaction conditions, the highest GLY conversion reached 85.5% with 59.3% of the selectivity to 1,3-dihydroxyacetone (DHA). In addition, the catalytic activity remained after being recycled five times.
Highlights
GLY is an unavoidable by-product of the biodiesel process, and with every 9 kg of biodiesel produced, about 1 kg of GLY is left behind
We briefly reported that a MgAl layered double hydroxides (LDHs)-hosted Cr(III) complex was effective in the selective oxidation of GLY [15]
The molar ratios of metals in LDH-hosted complexes were found to be almost the same as those of their corresponding LDH carriers, which suggested that no element loss occurred during the intercalation of the Cr(III) complex
Summary
GLY is an unavoidable by-product of the biodiesel process, and with every 9 kg of biodiesel produced, about 1 kg of GLY is left behind. There have been many studies on the heterogeneous catalytic oxidation of GLY over noble metal catalysts [7,8,9,10,11,12,13]. McMorn et al studied the selective oxidation of GLY over a range of transition metal-containing silicates and aluminophosphate catalysts, but the main products were the low-value formic acid and a mono-formate ester of GLY [6]. A series of binary and trinary LDHs as well as their hosted complexes were prepared, and the roles of LDH plates in the catalytic performance of LDH-hosted catalysts were investigated in the organic solvent-free selective oxidation of GLY into DHA with. Selective oxidation of GLY to DHA on LDH-hosted Cr(III) complex
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