In this study,a series of Na_(2)S-and S^(0)-decorated ZSM-5 adsorbents were prepared and their Hg^(0) adsorption performance was evaluated.Given that S^(0) and Na_(2)S were co-doped with the mass ratio of S^(0) to ZSM...In this study,a series of Na_(2)S-and S^(0)-decorated ZSM-5 adsorbents were prepared and their Hg^(0) adsorption performance was evaluated.Given that S^(0) and Na_(2)S were co-doped with the mass ratio of S^(0) to ZSM-5 fixed to 2:1,Hg^(0) removal efficiency quadruples compared with raw ZSM-5 and reached ca.100%at 300°C.Combined with the characterization results,it could be concluded that chemical properties,instead of physical structures,played an important role in Hg^(0) removal.Among the various gas components,O_(2),NO,and SO_(2) made negligible impacts on Hg^(0) capture over 2:1-S/ZSM-5 adsorbent surface.After recycling four times,Hg^(0) removal efficiency of 2:1-S/ZSM-5 adsorbent remained higher than 80%,which was indica-tive of a certain recyclability.Finally,XPS results illustrated that S^(0) and S^(2−)on 2:1-S/ZSM-5 surface functioned as the active sites for the transformation of Hg^(0) to HgS,which facilitated the chemisorption process and consequently led to an improved Hg^(0) capture performance.展开更多
基金This work is supported by the National Natural Science Foundation of China(No.51568024).
文摘In this study,a series of Na_(2)S-and S^(0)-decorated ZSM-5 adsorbents were prepared and their Hg^(0) adsorption performance was evaluated.Given that S^(0) and Na_(2)S were co-doped with the mass ratio of S^(0) to ZSM-5 fixed to 2:1,Hg^(0) removal efficiency quadruples compared with raw ZSM-5 and reached ca.100%at 300°C.Combined with the characterization results,it could be concluded that chemical properties,instead of physical structures,played an important role in Hg^(0) removal.Among the various gas components,O_(2),NO,and SO_(2) made negligible impacts on Hg^(0) capture over 2:1-S/ZSM-5 adsorbent surface.After recycling four times,Hg^(0) removal efficiency of 2:1-S/ZSM-5 adsorbent remained higher than 80%,which was indica-tive of a certain recyclability.Finally,XPS results illustrated that S^(0) and S^(2−)on 2:1-S/ZSM-5 surface functioned as the active sites for the transformation of Hg^(0) to HgS,which facilitated the chemisorption process and consequently led to an improved Hg^(0) capture performance.
