共沉淀-超临界干燥法制备纳米Cu/3Y-ZrO2复合材料及脱硫性能研究

研究了共沉淀-超临界干燥法得到的Cu/3Y-ZrO2纳米材料的结构和物相变化,并在模拟烟气中采用气相色谱仪对其脱除SO2的性能进行了比较研究.结果表明,以氨水为沉淀剂,采用共沉淀-超临界干燥法所得的中间产物,经真空热处理后,晶形发育较好且团聚较少,但在铜摩尔负载量为30%以上时才出现以金属Cu形式存在的铜组分衍射峰.铜组分负载量大、比表面积最小的产物,表现出脱硫效率最高;而铜组分负载量小、比表面积最大的产物脱硫活性却最差.总体而言,纳米Cu/3Y-ZrO2催化吸收剂的脱硫率随温度的上升而迅速增加,并在中温(300℃~500℃)脱硫率达到最大值,其稳定性也较好.

Preparation and desulphurization performance of nanometer Cu/3Y-ZrO2 composite material by coprecipitation-supercritical drying method

Variation of the structure and the phase of Cu/3Y-ZrO2 nanometer material obtained by coprecipitation-supercritical drying method was investigated in this paper.In the simulated flue gas,its desulphurization performance has been studied by a gas chromatograph.The results show that the in-process product prepared by coprecipitation-supercritical drying method employing ammonia liquor as the precipitant possesses well-developed crystal and less agglomeration with vacuum heat treatment,but the diffraction peak of copper component only exists in the form of metal copper when the copper load capacity is more than 30%.The outcome with heavy copper load capacity and the least specific surface area shows the highest desulphurization rate;however,desulphurization rate of the product with small copper load capacity and the maximum specific surface area is the worst.In general,the desulphurization rate of the nanometer Cu/3Y-ZrO2 catalytic absorbent increases promptly with the increment of temperature;and in the range of intermediate temperature(300 ℃～500 ℃),the desulphurization rate reaches the maximum along with the good stability.