In situ coating metal oxide on SBA-15 in one-pot synthesis
In situ coating metal oxide on SBA-15 in one-pot synthesis
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DOI：
10.1016/j.micromeso.2005.05.024
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发表时间：
2005-09
影响因子：
5.2
通讯作者：
Y. Wang;Z. Wu;Yi-lun Wei;J. Zhu
中科院分区：
文献类型：
--
作者：
Y. Wang;Z. Wu;Yi-lun Wei;J. Zhu
本文对MgO或CuO在SBA-15上的原位涂覆过程进行了解剖。通过在合成体系中加入简单的前驱盐，通过蒸发和煅烧回收复合材料，可以直接合成金属氧化物修饰的SBA-15功能介孔材料。研究了盐对SBA-15结构和客体氧化物分散的影响。在这种一锅法中，客体物质在蒸发和煅烧过程中融入SBA-15结构，盐中的阳离子和阴离子都影响复合材料的介观结构。阴离子的作用顺序为NO3-<Cl-<CH3COO-。在蒸发过程中，阳离子与P123的EO基团络合生成[M(EO)x] xn配合物。P123表面硅醇基与PEO头基对阳离子的竞争以及PEO头基与阳离子、阴离子之间的相互作用决定了SBA-15上氧化物的最终分散水平。
The in situ coating process of MgO or CuO on SBA-15 is anatomized in this article. Metal oxide-modified SBA-15 functional mesoporous materials can be directly synthesized through adding simple precursor salts into the synthetic system, recovering the composites via evaporation and subsequent calcination. The salt effect on the structure of SBA-15 and the dispersion of guest oxide were investigated. In this one-pot method, the guest species incorporate into the SBA-15 structure during the evaporation and calcinations, and both cation and anion in the salts affect the mesostructure of composite. The effect of anion follows the lyotropic series: NO3-<Cl-<CH3COO-. Cations undergo complexation with the EO groups of P123 upon the evaporation to produce a [M(EO)x]Xncomplex. The competition between the surface silanol groups and PEO headgroups in P123 to the cations and the interactions among PEO headgroup, cation and anion determine the final dispersion level of oxides on the SBA-15.