The difference in adsorption behavior of ammonia and trimethylamine on carbon was investigated on the basis of the Dubinin-Radushkevich plots and the -dW/d (A/β) distributions. The micropore size was heterogeneous to ammonia, whereas it was homogeneous to trimethylamine. Ammonia and trimethylamine were adsorbed selectively into the small micropores and the large micropores, respectively. The ratios of the average values of pore diameter to the molecular size for ammonia and trimethylamine were approximately constant, being from 1.8 to 2.4. N-Containing activated carbon characteristically showed a larger adsorption capacity for a polar adsorbate of small size, such as ammonia or hydrogen sulfide, than did raw activated carbon.
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Tanada et al. (1985) studied this question.