Investigation of adsorption performance deterioration of silica gel in water adsorption refrigeration

The possible reasons to cause adsorption deterioration of silica gel were analyzed. According to the possible application environment of silica gel, several different silica gel samples were prepared. The specific surface area, silanol content and adsorption capacity of those samples were tested and the corresponding adsorption isotherms were obtained. In terms of the experimental data comparisons, the adsorption performance of silica gel were affected by many factors, but the pollution by contaminated dust and other impurities was the most important one. In addition, the methods to restore their adsorption performance of the deteriorated samples were attempted, such as soaking in acid solution and washing.