Structure-reactivity correlations in MgAl hydrotalcite catalysts for biodiesel synthesis
Structure-reactivity correlations in MgAl hydrotalcite catalysts for biodiesel synthesis
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DOI：
10.1016/j.apcata.2005.03.027
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发表时间：
2005-06-22
影响因子：
5.5
通讯作者：
Wilson, K
中科院分区：
文献类型：
--
作者：
Cantrell, DG;Gillie, LJ;Wilson, K
采用无碱共沉淀法合成了一系列[Mg（1-x）Alx（OH）（2）]（x+）（CO 3）（x/n）（2-）水滑石材料，其组成范围为x = 0.25-0.55。所有材料都表现出水滑石相的XRD图谱特征，随着Mg含量的增加观察到稳定的晶格膨胀。XPS测量结果表明，与增加层内电子密度相关的Mg掺入的Al和Mg的光电子结合能降低。所有材料都是三丁酸甘油酯与甲醇液相酯交换反应制备生物柴油的有效催化剂。速率随Mg含量稳定增加，富Mg的Mg（2.93）Al催化剂比MgO活性高一个数量级，纯Al 2 O3完全惰性。反应速率还与层内电子密度相关，这可能与碱度增加有关。(c)2005 Elsevier B. V.保留所有权利。
A series of [Mg(1-x)Alx(OH)(2)](x+)(CO3)(x/n)(2-) hydrotalcite materials with compositions over the range x = 0.25-0.55 have been synthesised using an alkali-free coprecipitation route. All materials exhibit XRD patterns characteristic of the hydrotalcite phase with a steady lattice expansion observed with increasing Mg content. XPS measurements reveal a decrease in both the Al and Mg photoelectron binding energies with Mg incorporation which correlates with the increased intra-layer electron density. All materials are effective catalysts for the liquid phase transesterification of glyceryl tributyrate with methanol for biodiesel production. The rate increases steadily with Mg content, with the Mg rich Mg(2.93)AI catalyst an order of magnitude more active than MgO, with pure Al2O3 being completely inert. The rate of reaction also correlates with intralayer electron density which can be associated with increased basicity. (c) 2005 Elsevier B.V. All rights reserved.