Abstract
Applicability of amorphous silica–alumina to hydrogen sulphide bulk removal from natural gas has been discussed on the basis of thermodynamic descriptors obtained from single-gas adsorption tests. Experiments performed at 303K within a pressure range from vacuum to 1000kPa have shown the prominent role of narrow micropores in determining key adsorption performances, regardless to sample chemical composition. A specific microporous silica–alumina has been proposed as suitable adsorbent according to its (i) hydrogen sulphide Henry’s selectivity over methane; (ii) hydrogen sulphide specific capacity at 500kPa; (iii) hydrogen sulphide working capacity, assuming an isothermal depressurisation from 500kPa to 50kPa; and (iv) textural stability. Activity involving experiments with mixtures resembling raw natural gas has to be planned in order to confirm these promising clues.
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