The Effects of CeO2 Addition on the Performance of Zinc Oxide Sorbent Prepared by Microwave Solid-State Method for H2S Removal

Abstract

ZnO sorbents with different CeO2 loadings were prepared by microwave calcination and tested the performance for H2S removal in a fixed-bed reactor at 500 . The results r ℃ evealed that the Ce-doped sorbents have a higher efficiency and longer breakthrough time compared with non-modified sorbents. The optimal sulfur capacity (13.03 gS/100 g) and breakthrough time (17.5 h) were obtained when the content of CeO2 up to 4 wt.%. XRD, SEM, XPS and mercury porosimetry methods were used to characterize the structure of sorbents. Analysis data indicated that the addition of CeO2 leads to better pore structure and larger specific surface, which facilitates the diffusion of H2S into the active sites. Furthermore, the presence of CeO2 also results in an increase in the content of surface elements including Zn and O, which contributes to improve the ability of H2S removal.