MECHANOCHEMICAL SYNTHESIS OF CaO center dot ZnO center dot K2CO3 CATALYST: CHARACTERIZATION AND ACTIVITY FOR METHANOLYSIS OF SUNFLOWER OIL

作者：Kesic, Zeljka; Lukic, Ivana; Zdujic, Miodrag; Jovalekic, Cedomir; Liu, Hui; Skala, Dejan^*

来源：Chemical Industry & Chemical Engineering Quarterly, 2015, 21(1): 1-12.

DOI：10.2298/CICEQ131026041K

• mechanochemical synthesis
• CaO
• ZnO
• K2CO3
• mixed oxides
• biodiesel synthesis

The goal of this study was to prepare a CaO center dot ZnO catalyst containing a small amount of K2CO3 and analyze its activity for biodiesel synthesis. The catalyst was prepared using the following procedure: CaO and ZnO (mole ratio of 1:2), water and K2CO3 (in various amounts) were mechanochemically treated and after milling heated at 700 degrees C in air atmosphere for obtaining mixed CaO center dot ZnO/xK2CO3 oxides (x =0, 1, 2 and 4 mol of K2CO3 per 10 mol of CaO). All the samples were characterized by X-ray diffraction (XRD), inductively coupled plasma (ICP), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS), particle size laser diffraction (PSLD) distribution, solubility measurement of Ca, Zn and K ions in methanol as well as by determination of their alkalinity (Hammett indicator method). Prepared CaO center dot ZnO/xK2CO3 composite powders were tested as catalysts for methanolysis of sunflower oil at 70 degrees C using mole ratio of sunflower oil to methanol of 1:10 and with 2 mass% of catalyst based on oil weight. The presence of K2CO3 in prepared samples was found to increase the activity of catalyst, and that such effect is caused by homogeneous-heterogeneous catalysis of biodiesel synthesis.

• 出版日期2015-3
• 单位中国地质大学（北京）