锌基复合脱硫剂脱硫性能的研究

采用共沉淀法和机械混合法制备了Zn-Cu-Mn复合氧化物和ZCM(Z=ZnO、C=CuO、M=MnO2)复合氧化物，并对两种氧化物的脱硫能力进行了分析，同时也将这二种氧化物与单一的ZnO、MnO2和CuO的脱硫能力进行比较。利用XRD和FPD(火焰光度计)分别对复合氧化物的物质组成、结构和脱硫性能进行了分析。实验证明，Zn-Cu-Mn在250℃～350℃具有良好的脱硫能力，且300℃的脱硫能力最佳；空速为7799h-1时穿透硫容较高。煅烧温度为400℃时，Zn-Cu-Mn的脱硫能力高于ZnO。煅烧温度升高，Zn-Cu-Mn复合氧化物的比表面积和脱硫能力下降，且生成了具有尖晶石结构的CuMn2O4。与Zn-Cu-Mn复合氧化物和ZnO相比，ZCM复合氧化物的脱硫能力较低。煅烧温度为550℃时，ZCM体系中的MnO2分解为Mn2O3，当温度升至750℃时Mn2O3相消失，生成了具有尖晶石结构的CuMn2O4。

Desulfurization reactivity of zinc based composite oxides

The reactivity of Zn-Cu-Mn and ZCM composite oxides prepared respectively by Co-precipitation and mechanically mixing method were investigated and compared with that of ZnO, CuO and MnO2 . Composition and structure of desulfurizer were studied by using XRD, and the sulfur compound in gas was analyzed by using FPD(flame photometric detector). The experimental results show that Zn-Cu-Mn desulfurizer possesses higher sulfidation reactivity in the temperature range of 250℃～350℃, and the optimum sulfidation temperature is 300℃. The desulfurizer has higher breakthrough sulfur capcity at the space velocity of 7799h-1. It is found that the reactivity of Zn-Cu-Mn desulfurizer is higher than that of pure ZnO when the samples are calcined at 400℃. With the calcination temperature increasing, surface area and reactivity of Zn-Cu-Mn desulfurizer reduce gradually, at the same time, spinel CuMn2O4 appears. Compared with the reactivity of Zn-Cu-Mn desulfurizer and ZnO, the reactivity of ZCM desulfurizer is lower. When the ZCM desulfurizer is calcined at about 550℃, MnO2 is reduced to Mn2O3. But the Mn2O3 will disappear and CuMn2O4 will appear when the ZCM desulfurizer is calcined at 750℃.