Effect of additives on the growth behavior of silicalite crystal

The growth behavior of silicalite crystals in synthesis mixtures containing various aluminum contents was investigated by direct observation. It was found that the growth rate in the (001) direction decreased with the addition of aluminum, whereas the growth rates in the (100) and (010) directions d...

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Bibliographic Details
Published inMicroporous and mesoporous materials Vol. 25; no. 1; pp. 119 - 126
Main Authors Iwasaki, A, Sano, T, Kiyozumi, Y
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier Inc 09.12.1998
Elsevier
Subjects
Aspect ratio
Chemistry
Exact sciences and technology
General and physical chemistry
Impurity effect
Ion-exchange
Morphology
Surface physical chemistry
Zeolites: preparations and properties
ZSM-5
Aspect ratio
Impurity effect
Morphology
ZSM-5
Crystal growth
Growth rate
Silicates
Zeolite
Experimental study
Chemical synthesis
Molecular sieve
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Summary:The growth behavior of silicalite crystals in synthesis mixtures containing various aluminum contents was investigated by direct observation. It was found that the growth rate in the (001) direction decreased with the addition of aluminum, whereas the growth rates in the (100) and (010) directions displayed different behavior. Crystals with intergrowths were more frequently observed with an increase in aluminum concentration. The effects of the addition of iron and various organic compounds were also studied. In most cases, the growth rates in the (100) and (010) directions changed in a similar way. Based on crystal morphology, in particular the aspect ratio, a plausible mechanism for silicalite crystal growth is discussed.
ISSN:1387-1811
1873-3093
DOI:10.1016/S1387-1811(98)00181-4