A zeolite with interconnected 8-, 10- and 12-ring pores and its unique catalytic selectivity
A zeolite with interconnected 8-, 10- and 12-ring pores and its unique catalytic selectivity
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DOI：
10.1038/nmat921
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发表时间：
2003-07-01
期刊：
影响因子：
41.2
通讯作者：
Rius, J
中科院分区：
文献类型：
--
作者：
Corma, A;Rey, F;Rius, J
催化的主要目标之一是提高微孔材料的性能。这可以通过合成新的沸石来实现；孔隙结构可控。特别是，在同一结构中含有不同大小通道的沸石是可取的。在这里，我们报道了一个沸石含有完全互连的8-，10-和12成员环孔，结合有机1,5-双-（甲基吡咯烷）-戊烷的结构导向效应和锗对硅的框架同构取代合成。用同步加速器粉末衍射数据直接测定的晶体结构分析揭示了16个独立的四面体配位原子。这种热稳定性和水热稳定性的沸石结构，通过在框架中加入铝以酸性形式合成时，由于其特殊的孔隙拓扑结构，呈现出独特的催化形状选择性效应。
One of the major goals in catalysis is to improve the capabilities of microporous materials. This can be accomplished by synthesizing new zeolites; with controlled pore architectures. In particular, zeolites containing channels of different sizes in the same structure are desirable. Here, we report a zeolite containing fully interconnected 8-, 10- and 12-membered-ring pores, synthesized by combining the structure-directing effect of the organic 1,5-bis-(methylpyrrolidinium)-pentane and the framework isomorphic substitution of germanium for silicon. Analysis of the crystal structure determined by direct methods from synchrotron powder diffraction data reveals 16 independent tetrahedrally coordinated atoms. This thermally and hydrothermally stable zeolite structure, when synthesized in its acidic form by incorporating aluminium in the framework, presents unique catalytic shape-selectivity effects derived from its particular pore topology.