Ru-K-NaY catalyzed decarbonylation of dimethyl oxalate to dimethyl carbonate
A series of Ru-K-NaY catalysts with different Ru contents were prepared by using the method of excess impregnation which used NaY molecular sieves as carriers and pretreated by KNO3 solution.The catalysts were used for the first time in the reaction of decarbonylation of dimethyl oxalate(DMO)to prepare dimethyl carbonate(DMC).The effects of Ru loading and catalyst base on the reaction were investigated.The surface and structural properties as well as the alkaline properties of the Ru-K-NaY catalysts were characterized using XPS,BET and CO2-TPD,and it was determined that increasing the number of weak alkaline active sites as well as the number of Ru0 species of the catalysts could improve their catalytic activity and promote the generation of dimethyl carbonate.The reaction using Ru-K-NaY catalyst was optimized,yielding the DMO conversion and DMC selectivity were 83％and 69％,respectively.Finally,the stability test showed that the catalytic activity of the Ru-K-NaY catalyst was almost unchanged after 5 cycles.
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