Zhang Ni, Xue Huiyuan, Hu Rongrong
Key Laboratory of Applied Surface and Colloid Chemistry, School of Chemistry & Chemical Engineering, Shaanxi Normal University Xi'an 710119 China
RSC Adv. 2018 Sep 24;8(57):32922-32929. doi: 10.1039/c8ra06884d. eCollection 2018 Sep 18.
A novel CeO@CaO catalyst was prepared a hydrothermal method. The physicochemical properties and morphologies of the prepared CeO@CaO catalysts were characterized by X-ray diffraction, N physisorption, CO temperature-programmed desorption, X-ray photoelectron spectroscopy, transmission electron microscopy and energy dispersive X-ray analysis. It was found that the prepared CeO@CaO catalyst had a distinct core-shell structure. The catalytic activity of the CeO@CaO sample as a heterogeneous catalyst for the transesterification of soybean oil to produce biodiesel has been studied. The results showed that the optimum yield of biodiesel can reach 98% over the CeO@CaO-60 catalyst under the reaction conditions of 3 wt% catalyst, methanol to oil molar ratio of 6 : 1, reaction temperature of 70 °C and reaction time of 6 h. Stability tests indicated that the biodiesel yield can reach more than 80% even after 9 reaction cycles due to the strong synergic interaction between CaO and CeO.
采用水热法制备了一种新型的CeO@CaO催化剂。通过X射线衍射、N物理吸附、CO程序升温脱附、X射线光电子能谱、透射电子显微镜和能量色散X射线分析等手段对所制备的CeO@CaO催化剂的物理化学性质和形貌进行了表征。结果发现，所制备的CeO@CaO催化剂具有明显的核壳结构。研究了CeO@CaO样品作为多相催化剂用于大豆油酯交换制备生物柴油的催化活性。结果表明，在3 wt%催化剂、甲醇与油摩尔比为6∶1、反应温度为70℃、反应时间为6 h的反应条件下，CeO@CaO-60催化剂上生物柴油的最佳产率可达98%。稳定性测试表明，由于CaO和CeO之间存在强烈的协同相互作用，即使经过9次反应循环，生物柴油产率仍可达到80%以上。
