Abstract: Powdered activated coke was prepared from Xinjiang Heishan lignite by a drop-tube reactor. The physical
features and surface morphology of the coke samples were examined by Brunauer-Emmett-Teller（BET）measurements
and Scanning Electron Microscope（SEM），and the Hg0 adsorption capacity of the activated coke was studied in a bubble
reactor. The results show that the specific surface area of the activated coke is 402.1 m2/g，and its carbon consumption rate
is 42.18%. The specific surface area of the pore accounts for 77.5% of the total specific surface area，with an average
diameter of 2.10 nm. The average Hg0 adsorption efficiency of the activated coke is 85% within 3 h. The desorption capacity
of the used activated coke was further investigated through thermal desorption method，and the deep curing was carried out
on the desorbed Hg0 and the influencing factors on HgS synthesis were systematically analysed. The results showed that Hg0
was mainly adsorbed physically by the activated coke，with assistant of chemical adsorption. O2 could barely promote the
HgS synthesis，while SO2 and H2O had inhibiting effect on HgS synthesis.

Key words: powder activated coke, mercury adsorption, carbon consumption rate, desorption, recycling