Reactivity of Different Rank Coal Powders in UV Catalytic Photooxidation

In a self-made fixed catalytic photooxidation reactor,the reactivity of different ultra-fine coal powder in UV catalytic photooxidation was characterized by weightlessness,gas products components,the swelling ratios and variety in coal granular shape.The results indicate that the activity order of reactivity of ultra-fine coal powder from strong to weak is as follows: low-rank coal(Cdaf81.75%),high-rank coal(Cdaf=92.42%),middle-rank coal(81.75%Cdaf88.31%).The gas products are mainly composed of CO2 and CO,coupled with little CH4and C2H4.The swelling ratios of long-flame coal and anthracite increased evidently,while that of lignite and meagre coal almost did not change.Meanwhile,the outline of coal grain become dim.The reactivity of coal powders gradually decreased with the increasing of photooxidation time.