Pd-LOADED CATALYST FOR CATALYTIC DECARBONYLATION OF DIMETHYL OXALATE TO PRODUCE DIMETHYL CARBONATE
In order to develop a high efficient and low cost synthetic process for dimethyl carbonate(DMC),supported Pd catalysts were prepared by impregnation method on Na β(25),NaZSM-5(25),NaY(6),NaY(8),and NaY(10)zeolites,and it was first used in the decarbonylation reaction of dimethyl oxalate(DMO).The composition,valence,pore structure,morphology and crystal of the catalysts were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,transmission electron microscopy and Fourier transform infrared spectroscopy.The results showed that DMC was synthesized by the decarbonylation of DMO over Pd/NaY(6)catalyst.Under the optimum conditions such as a reaction temperature of 220 ℃,a reaction time of 90 min,a catalyst dosage of 1.0 g,a mass ratio of 1,4-dioxane to DMO of 4∶1,and a Pd loading of 0.2％,the conversion of DMO and the selectivity of DMC were 82.59％and 62.33％,respectively.After five cycles of regeneration,the catalyst showed good catalytic activity for DMO decarboxylation.Finally,the reaction mechanism of DMC synthesis by DMO decarbonylation over Pd/NaY(6)catalyst was reasonably deduced.
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