模板法制备La_2O_3-Ce_xZr_(1-x)O_2催化酯交换反应的研究
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摘要
以松木屑为模版,制备了La_2O_3-Ce_xZr_(1-x)O_2复合氧化物,用于催化餐饮废弃油合成生物柴油的酯交换反应。采用BET比表面积分析仪、扫描电子显微镜(SEM)对La_2O_3-Ce_xZr_(1-x)O_2进行表征。研究不同制备方法对催化剂活性的影响,分析不同的反应条件对酯交换反应产率的影响。结果表明:当反应条件为x=0.5,催化剂量为餐饮废油质量的5%,甲醇与餐饮废油物质的量的比为54∶1时,在165℃下反应4.5h左右,酯交换反应获得生物柴油的产率为91.1%。
La_2O_3-Ce_xZr_(1-x)O_2 compound oxide was prepared by template method from pine sawdust.It was used as catalyst in a transesterification of waste cooking oil synthesized to biodiesel.The La_2O_3-Ce_xZr_(1-x)O_2 was characterized by BET surface area analyzer and scanning electron microscopy(SEM).The effect of different preparation methods on activity of catalyst was studied.The influence of reaction condition on transesterification productivity was analyzed.The results indicate that biodiesel productivity can reach 91.1% at reaction temperature of 165 ℃ for 4.5 h and under the reaction conditions including x=0.5,catalyst being 5% of waste cooking oil in mass percent,amount of substance ratio of methanol to waste cooking oil being 54∶1.
La_2O_3-Ce_xZr_(1-x)O_2 compound oxide was prepared by template method from pine sawdust.It was used as catalyst in a transesterification of waste cooking oil synthesized to biodiesel.The La_2O_3-Ce_xZr_(1-x)O_2 was characterized by BET surface area analyzer and scanning electron microscopy(SEM).The effect of different preparation methods on activity of catalyst was studied.The influence of reaction condition on transesterification productivity was analyzed.The results indicate that biodiesel productivity can reach 91.1% at reaction temperature of 165 ℃ for 4.5 h and under the reaction conditions including x=0.5,catalyst being 5% of waste cooking oil in mass percent,amount of substance ratio of methanol to waste cooking oil being 54∶1.
引文
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[3]TIWARI A K,KUMAR A,RAHEMAN H.Biodiesel production from jatropha oil(Jatropha curcas)with high free fatty acids:an optimized process[J].Biomass and Bioenergy,2007,31(8):569-575.
[4]宋吉彬,银建中,张礼鸣,等.生物柴油制备技术研究进展[J].化工技术与开发,2007,36(9):22-26,46.
[5]滕虎,牟英,杨天奎,等.生物柴油研究进展[J].生物工程学报,2010,26(7):892-902.
[6]闵恩泽,唐忠,杜泽学,等.发展我国生物柴油产业的探讨[J].中国工程科学,2005,7(4):1-4,35.
[7]张志,史吉平,杜风光,等.生物柴油及其生产技术的进展[J].能源技术,2007,28(2):89-91.
[8]何灼成,魏小平,朱瑞国.生物柴油的制备方法及研究进展[J].润滑油与燃料,2006,16(3):7-10.
[9]FUERTES M C,SALGUEIRO W,SOMOZA A,et al.Thermal evolution of La3+/ZrO2solid solutions obtained by mechanochemical activation[J].Scripta Materialia,2004,50(2):301-305.
[10]WANG K,LI X J,JI S F,et al.Effect of CexZr1-xO2promoter on Ni-based SBA-15 catalyst for steam reforming of methane[J].Energy&Fuels,2016,23(1):25-31.
[11]OUYANG J,YANG H M.Investigation of the oxygen exchange property and oxygen storage capacity of CexZr1-xO2 nanocrystals[J].The Journal of Physical Chemistry,2009,113(17):6921-6928.
[12]ADAMSKI A,TABOR E,GIL B,et al.Interaction of NO and NO2 with the surface of CexZr1-xO2solid solutionsinfluence of the phase composition[J].Catalysis Today,2007,119(1/2/3/4):114-119.
[13]詹明军,吴介达,陆世鑫,等.络合法制备CexZr1-xO2固溶体及其表征[J].同济大学学报(自然科学版),2001,29(11):1331-1334.
[14]赵雷洪,郑小明,费金华.稀土氧化物固体碱催化剂的表面性质[J].催化学报,1996,13(5):52-53.
[15]IKRYANNIKOVA L N,MARKARYAN G L,KHARLANOV A N,et al.Electron-accepting surface properties of ceria-(praseodymia)-zirconia solids modified by Y3+or La3+studied by paramagnetic probe method[J].Applied Surface Science,2003,207(1/2/3/4):100-114.