In-situ diagnostik von zeolithbildungsprozessen auf basis der messung von ultraschalldämpfung und -geschwindigkeit
Başlık çevirisi mevcut değil.
- Tez No: 508169
- Danışmanlar: Prof. Dr. WILHELM SCHWIEGER
- Tez Türü: Doktora
- Konular: Beslenme ve Diyetetik, Fizyoloji, Anatomi, Nutrition and Dietetics, Physiology, Anatomy
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: Almanca
- Üniversite: Frıedrıch-Alexander-Unıversıtat Erlangen-Nurnberg
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
.In this work the synthesis of the zeolite by means of measurement of ultrasonic attenuation and velocity were examined. The aim of this study was to determine whether ultrasound can be used as a diagnostic method for process control of zeolite synthesis and if information regarding the reaction kinetics and mechanism can be obtained from the in - situ ultrasonic results. The selected synthesis techniques were the hydrothermal synthesis of zeolite A, according to the sol gel and the colloidal synthesis route, the colloidal synthesis of silicalite-1 and the sol-vothermal synthesis of CuBTC. In situ ultrasonic data correlated in the sol-gel synthesis with the development of crystallinity and in the colloidal synthesis with an increase in the amount of product. The ultrasonic velocity was responding more to the chemical and physical chang-es (e.g. ion concentration, density and temperature) in the liquid phase. The ultrasonic atten-uation was found to correlate better with the changes in the solid phase. The applicability of ultrasound was thereby demonstrated as a diagnostic in-situ method to monitor the changes in the synthesis of zeolite crystallization in both the liquid phase and the solid phase during the whole crystallization process. In crystallization processes of zeolites a metastable phase is often initially formed, which eventually transforms into an undesired stable phase. For this reason, it would be desirable to follow the crystallization of the synthesis process in a cost effective, robust and simple way. In all syntheses in this work, the beginning and the end of the crystallization and the duration of incubation and crystallization time could be accurately detected in situ. Thus, the method was found to be suitable for process control, not only in laboratory synthesis but also in the large industrial suitable. Due to the resulting high number of data points, kinetic data such as activation energy and reaction rate or order could be obtained in a simple and safe manner with minimal error. Due to the in - situ analysis, the synthesis was not disturbed and the data could be analyzed quickly in spite of the large data amount required for an ex - situ analysis. Thus, it could be shown that diagnostic ultrasound may also be used as a tool for maintenance of kinetic data. Although the ultrasound technology applied here is not a structure-sensitive method of anal-ysis, important information could be obtained from the results concerning the course of crys-tallization development. Through the use of ultrasound measurement in this work important information regarding the crystallization processes of zeolites and MOFs could be achieved and a better understanding of the operation of the in - situ ultrasonic monitoring are obtained.
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