A new microporous polymorph of silica isomorphous to zeolite MCM-22

被引：96

作者：

Camblor, MA

Corell, C

Corma, A

DiazCabanas, MJ

Nicolopoulos, S

GonzalezCalbet, JM

ValletRegi, M

机构：

[1] UNIV COMPLUTENSE, FAC QUIM, DEPT QUIM INORGAN, E-28040 MADRID, SPAIN

[2] UNIV COMPLUTENSE, FAC FARM, DEPT QUIM INORGAN & BIOINORGAN, E-28040 MADRID, SPAIN

来源：

CHEMISTRY OF MATERIALS | 1996年 / 8卷 / 10期

关键词：

D O I：

10.1021/cm960322v

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

ITQ-1, a microporous pure-silica polymorph isomorphous to zeolite MCM-22, forms upon calcination of a layered precursor obtained by hydrothermal synthesis. Calcined ITQ-1 contains a remarkably small concentration of connectivity defects (congruent to 7 Si(OSi)(3)OH mol %) in contrast to uncalcined ITQ-1 (congruent to 30%). Si-29 NMR spectra, which are in good agreement with the structure proposed for MCM-22, demonstrate the defects are not randomly distributed in the layered precursor but arise mostly from unconnected T1-O-T1 and T2-O-T3 bonds.

引用

页码：2415 / +

页数：1

共 18 条

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