The semi-coke of Zhundong coal with a certain absorbing capacity was prepared on a tube furnace at 400 ℃ in N2 atmosphere. Then

microwave pyrolysis of the semi-coke was performed under the condition of microwave induced discharge and shielding discharge. The crystal phase structure

surface functional groups and specific surface area of the cokes obtained in the above two states were analyzed by X-ray diffractometer(XRD)

Fourier transform infrared spectrometer(FT-IR) and BET surface detection. The results show that

compared with the non-discharge state

discharge heating for 10 min significantly increased the interlayer spacing(d002) and the lateral size of the crystallite(La) of the coke. Non-discharge microwave heating was slow to reduce the surface functional groups of the semi-coke

while pyrolysis in discharge state only for 10 min sharply decreased the amount of fat hydrocarbon and oxygen-contained functional groups of the semi-coke. Non-discharge microwave heating hardly changed the pore structure of the coke

but discharge for 30 min could increase the specific surface area of the coke from 4.4 m~2/g to 45.3 m~2/g. However

discharge for 60 min would seriously fracture the pore structure of the coke

reducing the specific surface area to 8.5 m~2/g.