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
收藏
页码：1478 / 1484
页数：7
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