In this paper, a desiccant coating with lithium and magnesium modified ion exchange resin (MIER) on
finned tube heat exchanger was prepared by impregnation method and electrostatic spraying process,
respectively. Impregnation condition and spraying process, which would badly affect the adsorption performance
of MEIR desiccant coating, were investigated in detail. Also the morphology, structure, composition
and thermal performance of desiccant coating were characterized by X-ray diffractometer (XRD), scanning
electron microscopy and energy dispersive spectroscopy (SEM-EDS) and temperature programmed
desorption (TPD), respectively. Besides, its cycle stability was also taken into consideration. The results
manifested that electrostatic spraying technique and impregnation method can be employed to prepare
a thick and uniform desiccant coating (120 μm) with modified ion exchange resin on finned tube heat
exchanger successfully, which had an excellent cycle stability. The results of TPD analysis showed, for
the enhanced interaction between the modified ions and water molecules, desorption activation energy
of the modified resin can be raised slightly. And the static and dynamic adsorption curves of modified
desiccant coating indicated that, whether in high or low humidity environment, the adsorption performance
could be significantly improved after modification.