Kinetic analysis of experimental intensity curves obtained during zeolite a synthesis using in situ 27Al NMR spectroscopy

被引：3

作者：

Miladinovic, Z. ^{[1
]}

Zakrzewska, J. ^{[1
]}

Dondur, V. ^{[2
]}

机构：

[1] Inst Gen & Phys Chem, Belgrade, Serbia

[2] Univ Belgrade, Fac Phys Chem, Belgrade 11001, Serbia

来源：

RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A | 2009年 / 83卷 / 09期

关键词：

X-RAY-DIFFRACTION; SOLID-STATE SI-29; ALKALINE-SOLUTIONS; GROWTH-KINETICS; CRYSTAL-GROWTH; PHASE-CHANGE; CRYSTALLIZATION; NUCLEATION; PRECURSORS; DISSOLUTION;

D O I：

10.1134/S0036024409090118

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：

Intensity curves obtained by in situ Al-27 NMR spectroscopy during zeolite A synthesis have been used as a method for comparative kinetic investigation of zeolite crystallization. Based on inflection point analysis of intensity curves, the times of t (sed) for process of sedimentation, t (start) for initiation, and t (finish) for completion of process in liquid phase connected to crystallization were evaluated. Obtained values for t (start) and t (finish) indicated that the rate of processes in liquid phase, connected with gel dissolution and growth of zeolite crystal, decreases with the increase of SiO2/Al2O3 molar ratio for the same Na2O concentration. On the other hand, increase of Na2O concentration for any of specified SiO2/Al2O3 molar ratio increases the rate of the same processes.

引用

页码：1478 / 1484

页数：7

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