Abstract
Supported nickel sulfate was proved to be an efficient catalyst for gas-phase dehydration of glycerol to acrolein at 340°C in the presence of oxygen. At a GHSV of glycerol of 873h−1, glycerol conversion over 17NiSO4-350 was still higher than 90% even after 10h of reaction, with selectivity to acrolein always higher than 70mol.%. It was demonstrated that Lewis acid sites were responsible for heavy compounds formation, and that Brønsted acid sites with medium and high strength were active sites for acrolein production from glycerol dehydration. The acidity of supported nickel sulfate was associated with one metastable structure, NiSO4·xH2O (0<x<1). Furthermore, not only nickel cations but also sulfate groups exhibited oxidizability during reactions, and loss of sulfur was the main reason for irreversible deactivation of supported nickel sulfate.
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