利用原位漫反射傅里叶红外光谱(DRIFTS)对硝酸盐与α-Fe2O3形成的混合气溶胶与羰基硫(COS)的非均相反应进行研究,并比较了不同硝酸盐(NaNO3、KNO3和NH4NO3)和α-Fe2O3的混合物与COS反应的情况.结果表明:NaNO3质量分数为4％的混合颗粒物与COS反应具有最高的反应活性,相比纯α-Fe2O3的反应速率提高了约5倍;含等质量分数(24％)硝酸盐的混合物和纯α-Fe2O3对COS的转化能力依次为:α-Fe2O3/KNO3＞α-Fe2O3/NaNO3＞α-Fe2O3/NH4NO3＞α-Fe2O3,而纯NaNO3、KNO3和NH4NO3颗粒与COS不发生反应.说明硝酸盐的存在很大程度上提高了COS在α-Fe2O3颗粒物表面的转化能力.%The heterogeneous reaction of carbonyl sulfide (COS) on hematite particles in the presence of nitrate was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). For sodium nitrate-containing samples, the hematite sample containing NaNO3 with mass fraction of 4% gave the highest reaction rate, which was about 5 times higher than that of hematite. For the particles containing nitrate at the same mass fraction (24%) the reactivity in descending order was α-Fe2O3/KNO3, α-Fe2O3/NaNO3, α-Fe2O3/NH4NO3 and α-Fe2O3. No uptake of COS was observed for the pure NaNO3, KNO3 and NH4NO3 samples. These results indicate that the added nitrate increased the COS conversion ability of α-Fe2O3 particles.
展开▼
