ZrO2基纳米催化吸收剂的制备及脱硫性能研究

采用分步沉淀法制备了担载CuO和ZnO的ZrO2基纳米催化吸收剂，对其结构和物相的变化进行了表征，并在模拟烟气中采用气相色谱仪研究了其脱除SOz的性能差别。结果表明，分步沉淀法制得的担载CuO和ZnO的ZrO2基纳米粉体的晶粒小于20mm，形貌多为球形或椭球形状，其中ZnO／ZrO2纳米粉体晶粒间有较大的团聚现象。对于纳米CuO／ZrO2催化吸收剂而言，比表面积越大，试样的脱硫率越高；而纳米ZnO／ZrO2粉体在200℃左右脱硫率达到最大，且随着温度的升高，脱硫率逐渐下降。当活性组分负载量为5％时，两种不同类型的催化吸收剂脱硫率均达到最高，稳定性也最好。相比之下，CuO／ZrO2纳米催化吸收剂适合于中温脱硫，而ZnO／ZrO2纳米催化吸收剂可在低温下更好地脱硫。

The Preparation of Nanometer ZrO2-Based Catalytic Absorbents Loading Different Oxidations and Their Desulphurization Performance

Nanometer ZrO2 catalysts loading CuO and ZnO are prepared by fractional precipitation method. The variation of the structure and phase are characterized and the desulphurization properties of catalyst are investigated using gas chromatograph in simulated flue gas. The results show that the crystal grain of nanometer ZrO2 loading CuO and ZnO which are prepared by fractional precipitation method are less than 20 nm as a shape of sphericity or ellipsoidal, and the nanometer ZnO/ZrO2 grain glomerates intensively. For nanometer CuO/ZrO2 catalytic absorbent, the desulphurization rate of samples is improved with the increment of specific surface area. However, the desulphurization rate of nanometer ZnO/ZrO2 powder reaches maximum at about 200~C, and along with temperature increasing, desulphurization rate drops gradually. Two different types of catalysts with 5% active component load capacity have the greatest desulphurization rate and best stability. In contrast with ZnO/ZrO2 that can desulphurize under low temperature condition effectively, CuO/ZrO2 is suitable for intermediate temperature desulphurization.