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Prospects and problems with photocatalytic destruction of inhalable particulates from combustion

YANG Lin-jun,SHEN Xiang-lin,SHENG Chang-dong(Key Laboratory of Clean Power Generation and Combustion Technology by the Ministry of Education,Southeast University,Nanjing 210096,China)  
The prospects and problems with photocatalytic destruction of inhalable particulates PM10 from combustion are analyzed,based on the research progress in gas phase and solid phase photocatalytic reaction,and formation mechanism of primary and secondary PM10.There exist prospects in controlling the primary particulates by catalytic degradation of its gaseous organic precursors and soluble organic fractions(SOF) on particulates with the photocatalysis coupled with thermal catalysis,reducing the formation of secondary organic aerosol(SOA) by photocatalytic oxidation of its precursors and solid-phase photocatalytic degradation of SOA.However,it is still difficult for the photocatalytic technology to effectively control the PM10 emissions at present due to the deactivation of photocatalyst,the depletion of UV photo flux,the effect of SO_2 and NOx,the very slow degradation rate of SOF and SOA,and the fact that photocatalytic process mostly occurrs at the surface of photocatalyst.
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