Washing oil (WO), 2-methyinaphthalene (MN) and quinolone (QL) were selected as the swelling agent to treat Naomaohu coal sample. The effects of swelling on the physical and chemical structure of coal sample were study. The results showed that comparison with raw coal, volatile and carbon contents of swelling coal samples decreased, especially the carbon content decreased significantly, approximately 8.63%, while H and O contents indicated an increasing tendency. Methylene carbon in samples swelling using WO, MN and QL decreased 6.37%, 5.74% and 7.55% respectively, but carbonyl and carboxyl carbon increased to 10.60%, 11.40% and 11.10%. After swelling, over 30% of specific surface area was reduced, but their average pore size were enlarged. The decrease of surface free energy could be attributed to the arrangement of coal structure via swelling. Pyrolysis tar and gas yields of swelling coal were higher than raw coal, especially for H2 and CO yields. However, the inhibition of crosslinking reaction led to lower the CO2 yield.
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