CaO-CeO_2@LiFe_5O_8磁性固体碱催化剂的表征及性能评价
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摘要
首先采用溶胶凝胶法制备了LiFe_5O_8磁核,并用共沉淀法制备了CaO-CeO_2@LiFe_5O_8磁性固体碱催化剂。通过XRD、SEM、TEM和CO_2-TPD对催化剂进行表征,并对其性能进行评价。结果表明:成功地制备了CaO-CeO_2@LiFe_5O_8磁性固体碱催化剂,并且CaO-CeO_2也成功地被吸附在LiFe_5O_8磁核表面,催化剂具备十分优良的铁磁性; CO_2-TPD表征结果说明,制备的催化剂具备较强的碱性,用于棕榈油酯交换反应体系中,生物柴油收率可达到95. 37%;制备的催化剂具有很好的耐酸、耐水性,重复使用5次后仍然保持较好的催化活性,且在外加磁场中易分离。
Li Fe_5O_8 magnetic core was prepared by sol-gel method,and CaO-CeO_2@ LiFe_5O_8 magnetic solid base catalyst was prepared by coprecipitation method. The structure of the catalyst was characterized by XRD,SEM,TEM and CO_2-TPD,and the property of the catalyst was evaluated. The results showed that CaO-CeO_2@LiFe_5O_8 magnetic solid base catalyst was successfully prepared,and CaO-CeO_2 was successfully adsorbed on the surface of LiFe_5O_8 magnetic core. The catalyst had very good ferromagnetism. The CO_2-TPD characterization results showed that the prepared catalyst had strong alkalinity and could be used in palm oil transesterification system,and the biodiesel yield could reach 95. 37%. At the same time,the catalyst had good acid and water resistance,and still maintained good catalytic activity after repeated use for five times,and it was easy to separate in an external magnetic field.
Li Fe_5O_8 magnetic core was prepared by sol-gel method,and CaO-CeO_2@ LiFe_5O_8 magnetic solid base catalyst was prepared by coprecipitation method. The structure of the catalyst was characterized by XRD,SEM,TEM and CO_2-TPD,and the property of the catalyst was evaluated. The results showed that CaO-CeO_2@LiFe_5O_8 magnetic solid base catalyst was successfully prepared,and CaO-CeO_2 was successfully adsorbed on the surface of LiFe_5O_8 magnetic core. The catalyst had very good ferromagnetism. The CO_2-TPD characterization results showed that the prepared catalyst had strong alkalinity and could be used in palm oil transesterification system,and the biodiesel yield could reach 95. 37%. At the same time,the catalyst had good acid and water resistance,and still maintained good catalytic activity after repeated use for five times,and it was easy to separate in an external magnetic field.
引文
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[5]李晓红,靳福全.Ca O/(Mg-Fe-O)固体碱的制备及其酯交换催化活性研究[J].中国油脂,2015,40(7):55-59.
[6]魏宏典.我国生物柴油行业发展综述[J].中国石油和化工标准与质量,2013(10):254.
[7]刘守庆,李雪梅,赵雷修,等.固体碱Ca O催化橡胶籽油制备生物柴油的研究[J].中国油脂,2012,37(7):59-62.
[8]孙树桢,张丽平,孟鑫,等.无甘油副产生物柴油的组分分析及其燃烧性能[J].石油化工,2012,41(3):335-341.
[9]LI H,XIA S Q,LUO H J,et al.Experimental and computational study on the compatibility of biodiesel/diesel/methanol blended fuel[J].Fuel,2016,173:52-59.
[10]李亚,佘德琴,蒋云霞,等.凹土负载KF/Ca O复合固体碱催化废油脂合成生物柴油[J].中国油脂,2016,41(11):66-69.
[11]JINDAPON W,JAIYEN S,NGAMCHARUSSRIVICHAIC.Seashell-derived mixed compounds of Ca,Zn and Al as active and stable catalysts for the transesterification of palm oil with methanol to biodiesel[J].Energ Convers Manage,2016,122:535-543.
[12]BANKOVIC-ILIC I B,MILADINOVIC M R,STAMEN-KOVIC O S,et al.Application of nano Ca O-based catalysts in biodiesel synthesis[J].Renew Sus Energ Rev,2017,72:746-760.
[13]李为民,姚超.酯交换法制备生物柴油研究进展[J].粮食与食品工业,2009,16(1):9-13.
[14]侯丽伟,易玉峰,丁福臣.高碘酸氧化法测定甘油含量影响因素研究[J].粮食与油脂,2010(1):36-39.
[15]郭萍梅,黄庆德.生物柴油中游离甘油和总甘油测定方法研究[J].粮食与油脂,2003(8):41-42.
[16]JIANG W,NIU X Y,YUAN F L,et al.Preparation of KF-La2O2CO3solid base catalysts and their excellent catalytic activities for transesterification of tributyrin with methanol[J].Catal Sci Technol,2014,4(9):2957-2968.
[17]范明明,刘延磊,张萍波,等.Ca O-MgO@Co Fe2O4磁性固体碱的制备及其大豆油酯交换反应催化性能[J].燃料化学学报,2016,44(4):422-427.
[18]EL-SHAARAWY M,RASHAD M,SHASH N,et al.Structural,AC conductivity,dielectric behavior and magnetic properties of Mg-substituted Li Fe5O8powders synthesized by sol-gel auto-combustion method[J].J Mater Sci-Mater El,2015,26(8):1-11.