Abstract
Activated charcoals were obtained from agricultural wastes (date stones and bagasse) by impregnation with zinc chloride and by steam gasification. Non-activated charcoals exhibit molecular sieve properties but their capacities are very low. Zinc chloride activation and steam activation to low burnouts improve the adsorption capacity and keep the molecular sieve action operating. However, steam gasification to high burnouts is accompanied by a loss of the molecular sieve property, leaving the pore structure accesible to adsorbates of various sizes.
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