STEAMING PROCESS FOR SILICON ENRICHMENT IN ZEOLITES FOR HEAT PUMP APPLICATIONS AND SOLAR DRIVEN THERMAL ADSORPTION STORAGE

摘要

Silicon enriched zeolites of type DAY (dealuminated Y) have been investigated by BET-Isofherm measurements, infrared spectroscopy, thermogravimetric and water sorption measurements with respect to their characterization of crystal state and water uptake properties. Variation of the adsorption behavior of samples is a result of a steaming process at different temperatures in dependence of time. It was found that different Si/Al ratios affects the typical characteristic of the silicon enriched zeolites, relating to their ad- and desorption temperatures. In comparison with other usual DAY zeolites it was found a different microporous and mesoporous hierarchy of the pore system. As a result of the steaming process, the silicon enriched zeolites enable more possibilities of low temperature application under specific conditions.