Abstract
Effects of pyrolysis conditions, including pyrolysis temperatures, pyrolysis atmosphere, and heating rate, on Hg0 removal of wood chip-based biomass coke (BC) under the basic simulated flue gas were systematically studied. The BET, SEM, FTIR, XPS and Hg-TPD were used to analyze the physicochemical properties and specific mercury compounds. The results show that the final pyrolysis temperature and pyrolysis atmosphere have greater influence on the mercury removal performance while heating rate affects little. The BC-N2 + 7%O2-800-10 has the best Hg0 removal efficiency under all the pyrolysis conditions, mainly due to the good pore structure and abundant surface oxygen-containing functional group. N2 + 7% O2, higher pyrolysis temperature and heating rate benefit for BC’s pore structure development. Oxygen-containing functional groups of OH, CO and COO are the main functional groups on the BC surface, which promotes Hg0 adsorption. The physically adsorbed Hg0 and more chemically adsorbed HgO are the main mercury compounds in the used BC.
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