he metal based composite adsorbent is made of composite adsorbent which is coated on the surface of the aluminum foil. Silica gel with different particle size is used as the matrix for production of samples. It is found that

in experimental conditions

large particle size contributes to the improvement of the coating amount on the surface of the aluminum foil. The silica gel of preferred particle size is adopted to make samples

and a comparison study of composite adsorbent and single silica gel samples is made. When the samples are completely dried and the environment condition is kept constant

compared with silica gel

the maximum moisture uptake of composite adsorbent is 30%-45% higher

within which the adsorption rate and maximum moisture uptake of lithium chloride composite adsorbent is higher than calcium chloride composite adsorbent. When the samples are not completely dried and the environment is periodically changes from adsorption condition to desorption condition

the cycle adsorption amount of composite adsorbent is 70%-120% higher than silica gel

and in high relative humidity conditions

calcium chloride composite adsorbent is higher than lithium chloride composite adsorbent.