Laboratory simulation of SO2 heterogeneous reactions on hematite surfaceunder di erent SO2 concentrations
CUI Huxiong , CHENG Tiantao , YU Xingna , CHEN Jianmin , XU Yongfu , FANG Wen
DOI:
Received September 18, 2008,Revised November 20, 2008, Accepted , Available online
Volume 21,2009,Pages 1103-1107
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The variations of sulfate formation and optical coe cients during SO2 heterogeneous reactions on hematite surface under di erent
SO2 concentrations were examined using in situ di use reflectance infrared Fourier transform spectroscopy (DRIFTS) and ion
chromatograph (IC). Laboratory experiments revealed that within ambient SO2 of 0.51–18.6 ppmv, sulfate product, producing velocity,
absorption and backward scattering coe cients showed an increasing trend with SO2 concentration. Under given SO2 concentration,
the velocity of sulfate producing performed an evolution of initial increasing, midterm decreasing and final stabilizing. The reactive
uptake and Brunauer-Emmett-Teller (BET) uptake coe cients of heterogeneous reactions rose with SO2 and exhibited high reactivities.
Considering global warming, this result is important for the knowledge of heterogeneous reactions of SO2 on mineral particle surface
in the atmosphere and the assessment of their impacts on radiative forcing.
