EFFICIENCY OF Al AND Cu ADDITION IN ZnO SORBENTS FOR DESULFURIZATION
Keywords:
Desulfurization, ZnO, H2S, citrate gel methodAbstract
ZnO with a 20 mol%Al (ZA20) or 20 mol%Cu (ZC20) addition synthesized by the citrate-gel method were compared for desulfurization efficiency, particularly H2S, at 300°C. The XRD results show the solid solution between the ZnAl2O4 and ZnO phases in ZA20 while 2 phases of hexagonal ZnO and monoclinic CuO appear in ZC20. The surface area increases in ZA20 but decreases in ZC20 as compared to ZnO. The desulfurization performance via a fixed-bed reactor shows ZC20 has a higher sulfur sorption capacity than ZA20 and ZnO, respectively. The products after desulfurization characterized by XRD are ZnS and ZnO in ZA20 while ZnS and CuS exist in ZC20. SEM micrographs show the larger grain sizes after desulfurization for all samples.
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