|
| Pt-Pd/CeO2-SiO2催化剂的稳定性研究 |
| Study on the Stability of Pt-Pd/CeO2-SiO2 Catalysts |
| 投稿时间：2019-02-23 |
| DOI： |
| 中文关键词: 催化化学 NO氧化 Pt-Pd/CeO2-SiO2 热稳定性 耐硫性 |
| 英文关键词: catalytic chemistry NO oxidation Pt-Pd/CeO2-SiO2 thermal stability sulfur resistance |
| 基金项目:国家自然科学基金(21467010)、国家重点研发课题(2017YFC0211303)、云南省自然基金(2016F124) |
|
| 摘要点击次数: 2684 |
| 全文下载次数: 1994 |
| 中文摘要: |
| 以浸渍法制备Pt-Pd/CeO2-SiO2催化剂(Pt-Pd/CS)，与Pt-Pd/Al2O3催化剂进行耐硫和耐热稳定性对比。用比表面(BET)、X射线衍射(XRD)和高分辨率透射电镜(HRTEM)等表征催化剂，用模拟气小样方法(SGB)评价催化活性。结果表明，Pt-Pd/CS具有比Pt-Pd/Al2O3催化剂更好的热稳定性和耐硫性。780℃，10 h老化后，Pt-Pd/Al2O3性能轻微下降，而Pt-Pd/CS催化剂中CeO2与贵金属的相互作用增强，NO氧化活性提高。在SO2气氛中，两种催化剂的低温活性均显劣化，但在350℃以上时，Pt-Pd/CS的活性反而提高；Pt-Pd/Al2O3对SO2的饱和吸附时间和吸附量分别为Pt-Pd/CS的3倍以上，因此活性衰减迅速。 |
| 英文摘要: |
| Pt-Pd/CeO2-SiO2 catalysts (Pt-Pd/CS) were prepared by impregnation method. Their sulfur resistance and thermal stability were compared with that of Pt-Pd/Al2O3 catalysts. The properties of Pt-Pd/CS catalysts were characterized by N2 adsorption, XRD, HRTEM. Their catalytic activity was evaluated by SGB test. The results showed that Pt-Pd/CS catalysts had better thermal stability and sulfur resistance than Pt-Pd/Al2O3 catalysts. The NO oxidation activity of Pt-Pd/Al2O3 catalysts slightly decreased after aging at 780℃ for 10 h, while the activity of Pt-Pd/CS catalysts increased after thermal aging due to the enhanced interaction between CeO2 and noble metals. In SO2-containing atmosphere, the low temperature activity of Pt-Pd/CS catalysts and Pt-Pd/Al2O3 catalysts significantly deteriorated, but the activity of Pt-Pd/CS increased when the temperature was above 350℃. The saturated adsorption time and saturated adsorption capacity of Pt-Pd/Al2O3 catalysts for SO2 were more than three times that of Pt-Pd/CS catalysts respectively, so the activity of Pt-Pd/Al2O3 catalyst decreases rapidly. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
