High pressure hydrogen sulphide adsorption on silica-aluminas

摘要

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 303 K within a pressure range from vacuum to 1000 kPa 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 500 kPa; (iii) hydrogen sulphide working capacity, assuming an isothermal depressurisation from 500 kPa to 50 kPa; and (iv) textural stability. Activity involving experiments with mixtures resembling raw natural gas has to be planned in order to confirm these promising clues.