Studies on Mg-Zn mixed oxide catalyst for biodiesel production
Studies on Mg-Zn mixed oxide catalyst for biodiesel production
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DOI：
10.1016/j.apcata.2014.10.015
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发表时间：
2015
影响因子：
5.5
通讯作者：
Nagaraju Pasupulety;G. Rempel;F. Ng
中科院分区：
文献类型：
--
作者：
Nagaraju Pasupulety;G. Rempel;F. Ng
Mg-Zn mixed oxides with different Mg to Zn mole ratio were synthesized using a CO2precipitation method and studied for the transesterification of soybean oil with methanol to produce fatty acid methyl esters (FAME) or biodiesel. The Mg to Zn optimized mole ratio was found to be about 3, denoted as Mg3Zn1. Different Mg3Zn1catalysts synthesized using co-precipitation (Cop), impregnation (IMP) and urea hydrolysis (urea) methods were also studied for FAME production. All Mg-Zn mixed oxides were characterized by FTIR, XRD, TG/DTA, CO2-TPD and HR-TEM/SEM-EDX techniques. Formation of FAME in this study was influenced by the Mg to Zn molar ratio and preparative parameters. The maximum FAME content (90% mass) was obtained at 65 °C for the Mg3Zn1CO2precipitation (Mg3Zn1CO2ppt) catalyst wherein a mixed oxide lattice Zn-Mg-O was established by HR-TEM. The contribution towards the greater biodiesel content was mainly attributed to the Zn-Mg-O lattice basic sites. The catalytic activity of Mg-Zn mixed oxides for FAME formation increases as follows; ZnO ≈ Mg3Zn1urea < Mg1Zn1≈ Mg3Zn1IMP < Mg5Zn1< MgO < Mg3Zn1Cop < Mg3Zn1CO2ppt.
