Nano-composite desiccation materials. Annual report, March 1987-February 1988

TL;DRAbstract

The overall objective of the research is to tailor-make novel desiccant materials consisting of different nano-composite materials using clays, gels, zeolites, and their mixtures and to determine and understand their water-sorption properties for cooling-system applications. Natural zeolites exhibited, as expected, extreme Type I isotherms for water sorption with upward deviation of isotherm at higher relative pressures which is attributed to the presence of impurities and less-than-perfect crystallinity of these zeolites. A few of the naturally occurring zeolites were identified to be suitable for modification by a proprietary process. Synthetic zeolites exchanged with various alkali metal cations such as Li/sup +/, Na/sup +/, K/sup +/, Rb/sup +/ and Cs/sup +/ also produced extreme Type I isotherms. The authors have developed a proprietary cation-exchange process which resulted in a reduction in the polarity of zeolite structure and yielded a desired isotherm shape. A commercially ava

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