Abstract
In this work a versatile and hydrothermally stable binder based coating with fast adsorption kinetics for the use in thermally driven adsorption chillers, heat pumps and within dehumidification processes is reported. Two different adsorbents, a SAPO-34 with a typical adsorption isotherm favorable for low desorption temperatures and a zeolite Y for higher desorption temperatures were used. The coatings were prepared out of an aqueous dispersion for different binder contents with a minimum of 2.5 wt%. The performance of the coating and the influence of the binder on the equilibrium and dynamic adsorption characteristics were evaluated by means of thermogravimetry and a volumetric pressure jump method. Finally the hydrothermal stability under typical application boundary conditions was evaluated with surprisingly fair stability even for a very low binder content of a 2.5 wt%.
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