| 铈锆固溶体的表面碱性对催化剂中Pd烧结性能的影响 | |
| Effect of Surface Basicity of Ceria Zirconia Solid Solution on Sintering Character of Pd | |
| 摘要: 以尿素为沉淀剂,采用均匀沉淀法制备了CexZr1-xO2(0≤x≤1)固溶体,并以其为载体制备了负载型 Pd/CexZr1-xO2催化剂。利用XRD、N2物理吸附、CO脉冲化学吸附、CO2-TPD、原位漫反射红外光谱(in situ DRIFTS)等技术考察了载体表面碱性强弱对Pd/CexZr1-xO2催化剂中Pd烧结行为的影响。结果表明,载体的弱碱性位能有效抑制Pd的烧结,其中Pd/Ce0.75Zr0.25O2催化剂其载体具有更多的弱碱性位,活性组分钯的分散度较高,催化剂的热稳定性较好。 | |
| 关键词: CexZr1-xO2固溶体 Pd分散度 烧结 碱性 | |
| 基金项目: 福建省工业科技重大项目(2010H6014)、福建省教育厅产学研合作课题(JA12023)资助项目。 | |
| Abstract: A series of CexZr1-xO2(0≤x≤1) solid solutions were prepared by uniformity precipitation using urea as the precipitant. Supported Pd catalyst was prepared by using the above solid solution as the carrier. The effect of the carriers surface basicity on the sintering behavior of Pd in Pd/CexZr1-xO2 catalyst was investigated by XRD, low temperature nitrogen adsorption-desorption, CO pulse chemisorption, CO2-TPD and in situ Diffuse Reflectance IR Fourier-Transform Spectroscopy(in situ DRIFTS). The results show that the sintering inhibition of palladium relates to the weaker basic site. Owing to its relative larger amount of weak basic site,the prepared Pd/Ce0.75Zr0.25O2 catalyst exhibits higher Pd dispersion and better thermal stability. | |
| Keywords: CexZr1-xO2 solid solutions dispersion of Pd sintering basicity | |
| 投稿时间：2012-12-28 修订日期：2013-01-28 | |
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| 肖益鸿,夏笑莹,阳艳玲,蔡国辉,郑勇,魏可镁.铈锆固溶体的表面碱性对催化剂中Pd烧结性能的影响[J].无机化学学报,2013,29(6):1129-1134. | |
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