Preparation and adsorption mechanism of composite adsorbents on solar powered adsorption refrigeration

Alcohol as adsorbate, 13x molecular sieve, concavo-convex earth and strontium chloride as main adsorption materials, a series of composite adsorbents with excellent adsorption performance were prepared through mixed method. Adsorption capacities of self-regulating composite adsorbents for alcohol were determined. Thermal stability of main adsorption material and desorption peak temperature of self-regulating composite adsorbents for alcohol were analyzed by TG-DTA method. Preparation conditions, such as composite proportion of adsorption material and varieties of pore size expanding, were experimentally researched. The results showed that: adsorption capacities of composite adsorbents made of several kinds of adsorption material are bigger than that of single adsorption material. Adding pore size extenders, such as El or E2, pore volume and pore size of the composite adsorbents could be increased, and adsorption capacities were improved. Adsorption capacities of self-prepared composite adsorbents for alcohol are higher than that of activated carbon. Adsorption capacities of the composite adsorbents of M4-0003 and MI-0001 for alcohol are about 2.4-4 times than that of activated carbon. Adsorption cooling volume of Ml-0001 for alcohol are about 2-6 times than that of activated carbon for alcohol. Peak temperature of desorption alcohol of composite adsorbents is lower than that of single adsorption material. Preliminary study on the composite mechanism of absorbents showed that the numbers of weak adsorption centers increase with lowering desorption temperature of the composite adsorbents.