Study on variation of micro-pores(<100 nm) and volatile components of different rank coals during carbonization

6 different rank coals(including anthracite,lean coal,coking coal,fat coal,weakly-caking coal and gas coal) were carbonized at 3 ℃/min in crucibles up to 1 000 ℃.The pore volume and pore diameter of chars and cokes produced at different final temperatures were analyzed by SORPTOMATIC1990 adsorber.Bio-rad FTS-165 pyrolysis-ir was used to measure six coals volatiles component and their releasing temperature domain at 10 ℃/min.It showed that during carbonization the quantity of produced volatile aromatics ranked by fat coal C1coking coal B1lean coal A5gas coal Y1.The quantity of hydroxyl group and carbonyl group released by fat coal C1 is the most in the six coals.The yield of aliphatic hydrocarbon ranked by C1B1A5,Y1.Except for CO2,the quantity of all kinds of groups released by weak-caking coal D1 is the least in the six coals.At 1 000 ℃,the rank of coke pore volume is C1D1B1YQ,and coke average pore radius rank is D1B1YQC1.C1 coal produced coke with the largest specific surface area,about 20 m2/g,and other three coals all produce coke with specific surface area about 3 m2/g.