Structure of ITQ-4, a New Pure Silica Polymorph Containing Large Pores and a Large Void Volume
Structure of ITQ-4, a New Pure Silica Polymorph Containing Large Pores and a Large Void Volume
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ITQ-4的结构，一种具有大孔和大空隙体积的新型纯二氧化硅多晶型物
DOI：
10.1021/cm970173w
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发表时间：
1997
影响因子：
8.6
通讯作者：
L. Villaescusa
中科院分区：
文献类型：
--
作者：
P. A. Barrett;M. A. Camblor;A. Corma;Richard H. Jones;L. Villaescusa
新的纯二氧化硅多晶型物ITQ-4，结构代码IFR，Si 32 O 64，单斜晶型I2/m a = 18.65243（13），B = 13.49597（8），c = 7.63109（6）A，β = 101.9781（5）°，是一种沸石材料，其包含具有12元环窗口作为最小孔径的大正弦通道。在已知的纯二氧化硅多晶型物中，其空隙体积（0.21 cm 3/g）仅被纯二氧化硅β的空隙体积超过。同步加速器粉末衍射数据的从头算结构解决方案的成功极大地帮助了Al和Si−OH缺陷基团的缺失，这产生了非常高的晶体学有序度。
The new pure silica polymorph ITQ-4, structure code IFR, Si32O64, monoclinic I2/m a = 18.65243(13), b = 13.49597(8), c = 7.63109(6) A, β = 101.9781(5)°, is a zeolitic material containing a large sinusoidal channel with 12-member ring windows as minimum apertures. Its void volume (0.21 cm3/g) is surpassed only by that of pure silica Beta among the known pure silica polymorphs. The success of the ab initio structure solution from synchrotron powder diffraction data was greatly assisted by the absence of Al and Si−OH defect groups, which generates a very high degree of crystallographic order.