Temperature-programmed decomposition desorption of mercury species over activated arbon sorbents for mercury removal from coal-derived fuel gas†

Azhar Uddin, Masaki Ozaki, Eiji Sasaoka, Shengji Wu

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The mercury (Hg0) removal process for coal-derived fuel gas in the integrated gasification combined cycle (IGCC) process will be one of the important issues for the development of a clean and highly efficient coal power generation system. Recently, iron-based sorbents, such as iron oxide (Fe 2O3), supported iron oxides on TiO2, and iron sulfides, were proposed as active mercury sorbents. TheH2S is one of the main impurity compounds in coal-derived fuel gas; therefore, H2S injection is not necessary in this system. HCl is also another impurity in coal-derived fuel gas. In this study, the contribution of HCl to the mercury removal from coal-derived fuel gas by a commercial activated carbon (AC) was studied using a emperatureprogrammed decomposition desorption (TPDD) technique. The TPDD technique was applied to understand the decomposition characteristics of the mercury species on the sorbents. The Hg0-removal experiments were carried out in a laboratory-scale fixed-bed reactor at 80-300 0C using simulated fuel gas and a commercial AC, and the TPDD experiments were carried out in a U-tube reactor in an inert carrier gas (He orN2) after mercury removal. The following results were obtained from this study: (1) HCl contributed to the mercury removal from the coal-derived fuel gas by the AC. (2) The mercury species captured on the AC in the HCl- and H2S-presence system was more stable than that of the H2S-presence system. (3) The stability of the mercury surface species formed on the AC in the H 2S-absence and HClpresence system was similar to that of mercury chloride (HgClx) species. copyright

Original languageEnglish
Pages (from-to)4710-4716
Number of pages7
JournalEnergy and Fuels
Issue number10
Publication statusPublished - Oct 15 2009


ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Energy Engineering and Power Technology
  • Fuel Technology

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