화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.33, No.11, 3134-3140, November, 2016
DOI10.1007/s11814-016-0182-7  Export Citation
Elemental mercury removal from syngas at high-temperature using activated char pyrolyzed from biomass and lignite
Huawei Zhang†, Hongju Shi, Jiangyan Chen, Ke Zhao, Li Wang, and Yanhong Hao1
  • College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, P. R. China
  • 1Environmental Engineering College, Shanxi University, Taiyuan 030013, P. R. China
E-mail:
Activated char obtained by the co-pyrolysis of a mixture of lignite and biomass impregnated with ZnCl2 solution was found to be effective for the high-temperature capture of mercury from syngas. The prepared samples were characterized by X-ray photoelectron spectroscopy, Hg-thermal programmed desorption as well as Brunauer-Emmett-Teller analysis. The results show that activated char exhibits a large surface area as well as abundant micropores and C-Cl, C=O, and COOH functional groups. During the chemisorption of mercury, gaseous Hg0 is first oxidized by C-Cl to HgCl2; HgCl2 which acts as the intermediate product then reacts with the C=O and COOH functional groups on the surface of activated char to generate Hg-OM. At high adsorption temperatures, Hg-OM on the adsorbent surface can further decompose and generate HgO. The C-Cl group is important for the first oxidation step of gaseous Hg0, and the formation of HgCl2 is the rate-determining step for the entire process of adsorption.
Keywords:Mercury;Syngas;Activated Char;Adsorption;Desorption
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