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为研究钾掺杂对铈锆固溶体催化性能的影响,以Ce0.7Zr0.3O2为基体制备了一系列钾掺杂的铈锆固溶体xK-Ce0.7Zr0.3O2(x=0.05、0.10、0.15、0.20、0.25、0.30)催化剂样品,通过程序升温氧化(TPO)过程进行活性评价,并通过XRD、BET、H2-TPR和O2-TPD进行分析表征。结果表明,采用溶胶凝胶法制备的催化剂的催化性能比络合燃烧法所制备的稍好;当钾的掺杂量为0.10≤x≤0.30时,xK-Ce0.7Zr0.3O2催化碳烟颗粒燃烧的活性得到提高,起燃温度和最大燃烧速率温度分别在315℃和375℃附近,明显优于Ce0.7Zr0.3O2;掺杂钾后的催化剂样品均能形成萤石结构,并且随钾掺杂量的增大比表面积减小。
In order to study the effect of potassium doping on the catalytic performance of cerium-zirconium solid solution, a series of potassium-doped cerium-zirconium solid solution xK-Ce0.7Zr0.3O2 (x = 0.05,0.10,0.15,0.20) was prepared from Ce0.7Zr0.3O2 , 0.25, 0.30) catalyst samples were evaluated for activity by a temperature programmed oxidation (TPO) process and were characterized by XRD, BET, H2-TPR and O2-TPD. The results show that the catalytic performance of the catalyst prepared by sol-gel method is slightly better than that prepared by the complex combustion method. When the dosage of potassium is 0.10≤x≤0.30, the catalytic activity of xK-Ce0.7Zr0.3O2 Combustion activity was improved, the ignition temperature and the maximum combustion rate were near 315 ℃ and 375 ℃ respectively, which was obviously better than that of Ce0.7Zr0.3O2. The samples doped with potassium could form the fluorite structure, The increase of the specific surface area decreases.