3 years ago

Synergic effect of Zn and Cu oxides dispersed on activated carbon during reactive adsorption of H2S at room temperature

Synergic effect of Zn and Cu oxides dispersed on activated carbon during reactive adsorption of H2S at room temperature
The origin of the synergic effect of zinc and copper oxides (ZnO-CuO) supported onto activated carbon on the removal of hydrogen sulphide (H2S) from gaseous streams at low temperature is investigated in this work. Sorbents with a fixed total metal content and variable Zn:Cu ratios were prepared by impregnation of a commercial activated carbon. H2S (100–3000 ppmv in N2) removal tests were run under dynamic conditions at 30 °C and compared through analysis of their breakthrough curves, adsorption rates and values of adsorption capacity. Fresh and spent sorbents were characterized by BET and pore size distribution via N2-adsorption, SEM-EDX and XPS. TPD/TPO experiments from partially and completely saturated sorbents allowed the speciation of adsorbed sulphur species, testifying the complexity of the surface reactions which strongly depended on the Zn:Cu ratio, on the interactions of metal oxides with activated carbon and on the textural properties of the sorbent.

Publisher URL: www.sciencedirect.com/science

DOI: S1387181117305619

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