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The Synthesis, Full Characterisation and Utilisation of Template-Free Silica Sodalite, a Novel Polymorph of Silica

机译:无模板硅方钠石-一种新型的二氧化硅多晶型物-的合成,表征与应用

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摘要

The sodalite group of compounds, with general formula M8ACHTUNGTRENUNG[TT’O4]6[X]y, is a compositionally diverse zeolite family comprising both naturally occurring members (e.g., lapis lazuli)[1] and many synthetic examples.[2] Although by far the most numerous subgroup of this family is the aluminosilicates, pure aluminate[3] and silicate versions have also been synthesised.[4–7] In the majority of sodalites the framework is charged, and the occluded cations and anions perform a charge-balancing role, meaning that the cage is largely filled and it is impossible to remove these ion clusters without collapse of the framework. This means that, in contrast to many of the larger zeolite systems, it has not been possible to utilise the framework for shape selective catalysis,[8] or easily model the guest-host relationship (owing to the ionic interactions).
机译:通式为M8ACHTUNGTRENUNG [TT'O4] 6 [X] y的方钠石化合物是一种组成多样的沸石族,包​​括两种天然存在的成员(例如青金石)[1]和许多合成实例。[2]尽管迄今为止该族中最多的亚族是铝硅酸盐,但也已合成了纯铝酸盐[3]和硅酸盐。[4-7]在大多数方钠石中,框架带电,并且被封闭的阳离子和阴离子表现出电荷平衡的作用,这意味着笼子被大量填充,并且如果不折叠框架就不可能除去这些离子簇。这意味着,与许多较大的沸石系统相比,不可能利用框架进行形状选择催化[8]或轻松模拟客体-主体关系(由于离子相互作用)。

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