| 초록 |
Glycerol carbonlylation with CO2 to produce glycerol carbonate has received much attention as an alternative route to simultaneously utilize glycerol, a byproduct of biodiesel and CO2, a greenhouse gas. La2O2CO3/ZnO materials were used as a conventional catalyst for this reaction. In this study, we prepared La2O2CO3/ZnO catalyst by two different methods – coprecipitation, a conventional method and ethylene glycol-ligation/solution combustion, a novel method and investigated their catalytic performance as well as materials’ properties related to catalytic activity through FE-SEM, HR-TEM, FT-IR, Raman, XRD, N2 adsorption/desorption technique and reaction tests. In the reaction results, La2O2CO3/ZnO catalysts prepared by the novel method (NLZ) showed higher yields of glycerol carbonate than La2O2CO3/ZnO catalysts prepared by the conventional method (CLZ), which was caused by extremely high selectivities of glycerol carbonate of NLZ catalysts even with low glycerol conversions. Depending on the preparation methods, the dominant La2O2CO3 phase in the catalysts were different: monoclinic La2O2CO3 phase for NLZ catalysts and hexagonal La2O2CO3 phase for CLZ catalysts. |
