ZnO/SBA-15 composites for mid-temperature removal of H2S: Synthesis, performance and regeneration studies.

MUREDDU, MAURO;FERINO, ITALO;ROMBI, ELISABETTA;CUTRUFELLO, MARIA GIORGIA;Deiana P.;ARDU, ANDREA;MUSINU, ANNA MARIA GIOVANNA;Piccaluga G.;CANNAS, CARLA

2012-01-01

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Abstract

ZnO/SBA-15 composites for mid-temperature H 2S removal were prepared by both conventional Incipient Wetness and Two-Solvents impregnation techniques. The composites, differing as to the ZnO loading and the calcination treatment, were characterised by X-ray diffraction, transmission electron microscopy (also in the high resolution mode) and N 2 physisorption. Characterisation techniques revealed that zinc oxide was highly dispersed into/over the well-ordered mesoporous channels. In all the composites the mesostructure of the support was still retained together with a high surface area, large pore volume and uniform pore size. The sorbent performance for H 2S removal from a H 2S/He stream was investigated and compared with a commercial ZnO sorbent. The confinement of the active phase in the SBA-15 structure enhances its ability to interact with hydrogen sulphide, which results in improved performance. Temperature-programmed experiments were carried out for selecting appropriate regeneration conditions. The regenerated sorbent showed a sorption capacity even higher than that of the fresh ones. Such behaviour is maintained in repeated sorption/regeneration cycles.