Direct soft-templating route to crystalline mesoporous transition-metal oxides
Direct soft-templating route to crystalline mesoporous transition-metal oxides
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DOI：
10.1016/j.colsurfa.2014.03.059
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发表时间：
2014-06
期刊：
影响因子：
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通讯作者：
Limin Guo;S. Ida;Hidehisa Hagiwara;T. Daio;T. Ishihara
中科院分区：
文献类型：
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作者：
Limin Guo;S. Ida;Hidehisa Hagiwara;T. Daio;T. Ishihara
发展了一种直接的、通用的软模板法来制备晶态介孔过渡金属氧化物。该方法简便、通用。目前已经成功地合成了Nb_2O_5、Ta_2O_5和α-Fe_2O_3等过渡金属氧化物介孔材料。采用XRD、TG-DTA、SEM、TEM和N2吸附等手段对所合成的金属氧化物的孔结构和结晶度进行了表征。非晶态金属氧化物的晶化导致比表面积的降低，这是由于相关的非晶态金属氧化物物种的凝聚和微晶生长。同时，孔隙体积保持良好，这意味着有限的体积收缩。随着煅烧温度的升高，晶粒尺寸增大，孔径逐渐增大，小孔逐渐长大。所合成的金属氧化物不仅具有清晰的介观结构，而且具有较高的结晶度。值得注意的是，所有试剂都是市售的，并且不经任何处理使用。它可以很容易地复制的研究人员，即使没有任何经验的溶胶-凝胶相关的合成。
A direct and general soft-templating method has been developed to prepare crystalline mesoporous transition metal oxides. The method was versatile and simple. Several crystalline mesoporous transition metal oxides have been successfully synthesized, such as Nb2O5, Ta2O5and α-Fe2O3. The porous structure, and crystallinity of as-synthesized metal oxides were characterized by XRD, TG-DTA, SEM, TEM and N2sorption techniques. The crystallization of amorphous metal oxides resulted in the decrease of specific surface area due to the condensation of related amorphous metal oxide species and crystallite growth. At the same time, the pore volume was well maintained, which means the limited volume shrinkage. The pore size increased with the increasing of calcination temperature due to the growth of grain size and small pores emerged into larger ones. The as-synthesized metal oxides not only had clear mesostructure but also high crystallinity. Notably, all the reagents were commercial available and used without any treatment. It can be easily reproduced by researchers even without any experience in sol–gel related synthesis.