Abstract
The use of a π-acidic triangular silver(I) pyrazolate (Ag3pz3) as an adsorbent for adsorptive desulfurization (ADS) has been investigated in this report. Ag3pz3 shows very strong adsorptive affinity for aromatic sulfur compounds with the maximum adsorption capacity at 298 K being 58.5 and 51.5 mg S/g for dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (DMDBT), respectively. This adsorbent (used in the form of Ag3pz3·toulene) can reduce the S-content in iso-octane containing DBT or DMDBT from 100 mg S/L to ∼ 1 mg S/L after a static adsorption with an adsorbent dose of 4.52 g/L at 298 K. The adsorption mechanism can be well understood on the basis of weak intermolecular interactions, supported via the single-crystal structural determination and theoretical study. Ag3pz3 would represent a new type of adsorbent, which may find use in the adsorptive removal of dibenzothiophenes to achieve ultra-deep desulfurization.
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