Abstract
In this study, some metal-M/aluminum carbonate absorption materials with molar ratio of M:Al=3:1 were manufactured. There was Cu–Al, Mn–Al, Fe–Al three kinds of sorbents synthesized by co-precipitate method. The physicochemical structures during mercury removal were analyzed by a surface area and pore structure analyzer (BET), an X-ray diffraction (XRD), a scanning electron microscope coupled with an electron detection scanning (SEM/EDS), and X-ray fluorescence (XRF). The results showed that surface areas for metal-M/aluminum carbonate sorbents were only about 11~12 m2/g and the metal ratio loaded was more than 80%. Lab-scale tests mercury removal efficiency in the temperature range of 200–300 oC indicated that there was an improvement in the performance of mercury removal by increasing reaction temperature. Cu–Al, Fe–Al and Mn–Al all three sorbents reached their absorption equivalent of 256.6, 253.3 and 247.0 μg/g under 300 oC operating temperature and 19736 h-1 gas hourly space velocity. Additionally, the presence of transition metals can significantly improve the efficiency of mercury removal of the absorption materials.
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