Structure-sensitive biodiesel synthesis over MgO nanocrystals
Structure-sensitive biodiesel synthesis over MgO nanocrystals
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DOI：
10.1039/b814357a
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发表时间：
2009-01-01
期刊：
影响因子：
9.8
通讯作者：
Lee, Adam F.
中科院分区：
文献类型：
--
作者：
Montero, Janine M.;Gai, Pratibha;Lee, Adam F.
采用简单的溶胶-凝胶法合成了尺寸可控的MgO纳米晶，并通过粉末XRD、HRTEM和XPS对其体相和表面性质进行了表征。低温处理产生的小的立方MgO单晶暴露弱碱性（100）表面。高温退火将这些转变成方镁石MgO的大的阶梯状立方体纳米颗粒，其终止于更基本的（110）和（111）表面。表面电子结构的尺寸依赖性演变与这些MgO纳米晶体对三丁酸甘油酯酯交换反应的相关催化活性直接相关，揭示了对（110）和（111）晶面的明显结构偏好。
Size-controlled MgO nanocrystals were synthesised via a simple sol-gel method and their bulk and surface properties characterised by powder XRD, HRTEM and XPS. Small, cubic MgO single crystals, generated by low temperature processing, expose weakly basic (100) surfaces. High temperature annealing transforms these into large, stepped cuboidal nanoparticles of periclase MgO which terminate in more basic (110) and (111) surfaces. The size dependent evolution of surface electronic structure correlates directly with the associated catalytic activity of these MgO nanocrystals towards glyceryl tributyrate transesterification, revealing a pronounced structural preference for (110) and (111) facets.