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RISS 인기검색어
- 검색키워드
- 저자 : Kunzan Qiu (검색결과 2 건)
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Experimental study on ZnO-TiO2 sorbents for the removal of elemental mercury
Kunzan Qiu,Jinsong Zhou,Pan Qi,Qixin Zhou,Xiang Gao,Zhongyang Luo 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.9
ZnO-TiO2 sorbents synthesized by an impregnation method were characterized through XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy) and EDS (Energy dispersive spectrometer) analyses. An experiment concerning the adsorption of Hg0 by ZnO-TiO2 under a simulated fuel gas atmosphere was then conducted in a benchscale fixed-bed reactor. The effects of ZnO loading amounts and reaction temperatures on Hg0 removal performance were analyzed. The results showed that ZnO-TiO2 sorbents exhibited excellent Hg0 removal capacity in the presence of H2S at 150 oC and 200 oC; 95.2% and 91.2% of Hg0 was removed, respectively, under the experimental conditions. There are two possible causes for the H2S reacting on the surface of ZnO-TiO2: (1) H2S directly reacted with ZnO to form ZnS, (2) H2S was oxidized to elemental sulfur (Sad) by means of active oxygen on the sorbent surface, and then Sad provided active absorption sites for Hg0 to form HgS. This study identifies three reasons why higher temperatures limit mercury removal. First, the reaction between Hg0 and H2S is inhibited at high temperatures. Second, HgS, as the resulting product in the reaction of mercury removal, becomes unstable at high temperatures. Third, the desulfurization reaction strengthens at higher temperatures, and it is likely that H2S directly reacts with ZnO, thus decreasing the Sad on the sorbent surfaces.
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Regeneration mechanism of CeO2-TiO2 sorbents for elemental mercury capture from syngas
Jinsong Zhou,Kunzan Qiu,Wenhui Hou,Shuaiqi Meng,Xiang Gao 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.3
The characteristics of mercury desorption on spent CeO2-TiO2 (CeTi) sorbents were investigated to improve the cyclic regeneration removal activity. Mercury was significantly released in the form of elemental mercury at temperatures ranging from 250 to 280 oC. Mercury desorption had a significant correlation with regeneration temperature, but was independent of the heating rate and regeneration conditions. The optimal regeneration temperature was 500 oC. The CeTi sorbents could be easily restored by simple heating and exhibited superior activity over several capture- regeneration cycles. The amount of released mercury almost equaled the adsorbed mercury on the surface of the CeTi sorbent, indicating that most of the adsorbed mercury was released during the heating process.
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