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In carbonylation of ethylene glycol to ethylene carbonate with urea catalyzed by ZnO, which was considered as a heterogeneous catalyst. ZnO is observed to be dissolved in the reactants probably due to the formation of Zn(NCO)2(NH3)2 making the reaction homogeneously catalyzed. To our knowledge, it is firstly reported that the reaction experienced three states including ZnO dissolution, homogeneous...
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