Insightinto the Tunable CuY Catalyst for DiethylCarbonate by Oxycarbonylation: Preparation Methods and Precursors.

Threedifferent methods were used to prepare CuY catalysts, whichplay an important role in Cu loading and ion-exchange level duringthe oxidative carbonylation of ethanol to synthesize diethyl carbonate.Of the prepared CuY catalysts, those synthesized by the ammonia evaporationmethod exhibited a significantly enhanced activity compared to thoseobtained by the other two methods. In addition, under optimized conditions,four different copper precursors were applied to adjust the texturalproperties and chemical states of the CuY catalysts. To obtain a deepunderstanding of their structure–performance relationship,XRD, XPS, CO adsorption, DRIFTS, and NH3TPD were conductedto characterize the CuY catalysts. The experimental results indicatedthat the catalytic performances were in line with the proportionsof Cu+in CuY catalysts, which can be regulated by cupricprecursors. In addition, the textural structures of the catalystsand the acidity and type of Cu+species influenced by theprecursors were all responsible for the activity and product distribution. [ABSTRACT FROM AUTHOR]