MgFe氧化物催化氧化吸附SO_2的研究

Study on the MgFe complex oxides for SO_2 catalytic oxidative adsorption

用不同制备方式得到了三种MgFe复合氧化物和混合物 ,即机械混合的Fe2 O3 +MgO ;以MgO为载体 ,浸渍法制备的Fe2 O3 /MgO ;以MgFe水滑石类为前驱体 ,经焙烧制得MgFeOx.分别测定了三种材料对SO2 氧化吸附的速率和硫容量 ,发现MgFeOx 脱硫性能最好 ,硫容量达到 1.4gSO2 / (g吸附剂 ) .通过BET ,XRD和IR的表征 ,分析了材料脱硫性能好的原因 ,主要是高度分散状态的MgFeOx 中Mg和Fe的协同作用 ,Fe3 + 起到了催化氧化的作用 ,Mg是吸附中心 ,氧化和吸附的耦合加快了MgFeOx 对SO2 的吸附速率 。

Three kinds of complex oxides and mixed oxide have been prepared with different methods, MgO mixed simply with Fe 2O 3,loaded Fe 2O 3 on MgO with impregnation and calcinated on the MgFe hydrotalcite. The desulfurative rates and the sulfur capacities of the materials were measured. It was found that MgFeO x had the best character and its sulfur capacity exceeded 1.4?g SO 2/(g material). The reason for high rate and capacity was analyzed from BET data, XRD and IR spectra. The synergistic action of Mg and Fe dispersed uniformly in complex oxide, in which Fe was the oxidizing center and Mg was the adsorbing center, speeded up the desulfurative rates and increased the sulfur capacities.