Glass - Back to the Future!

Presenting Author:
Theresia Palenta

article posted 06 April 2016

Theresia Palenta 2007 2012 Friedrich-Schiller-University Jena, Diploma in Chemistry Since 2012 Phd. Student at Otto-Schott-Institute of materials research in the group of Prof. Lothar Wondraczek

Kinetics of the zeolite collapse

Theresia Palenta*+, Anne Oestreicher+, Sindy Fuhrmann+, Scott T. Misture#, Lothar Wondraczek+
+ Otto-Schott-Institute of materials research, Fraunhoferstr. 6, 07743 Jena, Germany # School of Ceramic Engineering & Materials Science, NYS College of Ceramics at Alfred University, Binns-Merrill 116, Alfred, NY 14802

The thermal collapse of a zeolite results in an X-ray amorphous material. Here, we report in situ data of the collapse of Faujasite-type zeolites X and LSX, obtained through high-speed X-ray diffraction. These data are used to analyse the reaction kinetics of different lattice planes, and the overall kinetic functions of the collapse process, including the reaction rate, the activation energy and a mechanistic description of the reaction process and order. This aims for deducing the driving force of the reaction, i.e., the differentiation of diffusion or viscosity driven processes and interface reactions. In conclusion, this unique route of preparing a glass through collapsing a high-entropy crystalline structure is compared to the conventional process of melt quenching in terms of the underlying reaction kinetics.

Figure 1: HT-XRD diffractogram of isothermal measurement of zeolite X at 810 C.