Highly Ordered Hierarchical Macroporous-Mesoporous Alumina with Crystalline Walls

Li Zhen-Xing; Li Ming-Ming

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Highly Ordered Hierarchical Macroporous-Mesoporous Alumina with Crystalline Walls

机译：具有结晶壁的高度有序分层大孔-介孔氧化铝

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Highly ordered hierarchical macroporous-mesoporous alumina with crystalline walls are synthesized by facial route. The general synthesis strategy is based on a sol-gel process associated with block copolymers as soft templates and polystyrene colloidal crystals as hard template to produce macropore and mesopore structures, respectively. Small-angle XRD, TEM and Nitrogen adsorption and desorption results show that hierarchical macroporous-mesoporous alumina possess highly ordered two-dimensional hexagonal mesostructured and highly ordered face centered cubic macropore arrays structure. The present work reveals that the hierarchical macroporous-mesoporous structure can endure high temperature up to 900 A degrees C. FTIR pyridine adsorption measurements show that the amount of Lewis acid sites provided by hierarchical macroporous-mesoporous alumina is nearly two times more than that for mesoporous alumina, indicating that the open macroporous structure may be in favor of the reactant transfer, and the consequently superior activity. Large surface areas, high thermal stability, uniform pore structures and large amounts of surface Lewis acid sites illustrate that these materials are expected to find wide applications in catalysis realm.

机译：通过面谱法合成了具有结晶壁的高度有序的多级大孔-介孔氧化铝。一般的合成策略是基于溶胶-凝胶工艺，嵌段共聚物作为软模板，聚苯乙烯胶体晶体作为硬模板，分别产生大孔和介孔结构。小角XRD、TEM和氮气吸附解吸结果表明，多级大孔-介孔氧化铝具有高度有序的二维六方介观结构和高度有序的面心立方大孔阵列结构。本工作表明，多级大孔-介孔结构可以承受高达900 A的高温，FTIR吡啶吸附测试表明，多级大孔-介孔氧化铝提供的路易斯酸位点数量几乎是介孔氧化铝的2倍，表明开放的大孔结构可能有利于反应物转移，以及因此而优越的活性。大表面积、高热稳定性、均匀的孔隙结构和大量的表面路易斯酸位点表明，这些材料有望在催化领域得到广泛的应用。

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来源
《Catalysis Letters》 |2016年第9期|1712-1717|共6页
作者
Li Zhen-Xing; Li Ming-Ming;
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作者单位

China Univ Petr, Inst New Energy, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China;

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原文格式 PDF
正文语种英语
中图分类催化;
关键词
Macroporous-mesoporous alumina; Crystalline walls; Synthesis; Catalysis;

机译：大孔-介孔氧化铝;结晶壁;合成;催化作用;

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Highly Ordered Hierarchical Macroporous-Mesoporous Alumina with Crystalline Walls

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