光照对SO_2在矿质氧化物表面非均相反应的影响

Effect of UV light on the heterogeneous reaction of SO_2 on different mineral oxide surfaces

使用原位漫反射红外傅里叶变换光谱(DRIFTS)研究了SO_2在α-Al_2O_3、TiO_2、CaO和α-Fe_2O_3颗粒物表面的非均相反应,考察了紫外光光照(波长约365 nm)对SO_2在不同氧化物表面反应的影响.结果表明,无紫外光照射条件下,SO_2在TiO_2、α-Al_2O_3、CaO颗粒物表面反应的主要产物为亚硫酸盐;有紫外光照射条件下,SO_2在TiO_2、α-Al_2O_3、CaO颗粒物表面反应的主要产物为硫酸盐;但紫外光照射对SO_2在α-Fe_2O_3表面的反应并没有明显的影响.推测机理可能是光照促进了颗粒物表面的亚硫酸盐向硫酸盐的转化.

Heterogeneous reactions of SO2 on α-Al2O3,TiO2,CaO and α-Fe2O3 particle surfaces were studied using in situ diffuse reflectance infrared Fourier transform spectroscopy（ DRIFTS）. The influence of UV radiation（ λ = ca. 365 nm） on the reaction of SO2 on different mineral oxides were investigated. The main product of the heterogeneous reactions of SO2 on TiO2,α-Al2O3 and CaO particles was sulfite in dark condition and sulfate in the presence of UV illumination,respectively. The UV illumination showed no obvious impact on the reaction on α-Fe2O3. The mechanism was proposed that the light may promote the conversion of sulfite to the sulfate on the surface of the particles.