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| Pd-Rh/AlCeZrOx 催化剂的制备及性能评价研究 |
| Study on Preparation and Performance Evaluation of Pd-Rh/AlCeZrOx Catalyst |
| Received:October 02, 2017 Revised:October 25, 2017 |
| DOI：10.14093/j.cnki.cn10-1132/d.2018.01.001 |
| 中文关键词: 金属材料 汽车尾气催化剂 Pd-Rh/AlCeZrOx 制备 表征 催化活性 |
| 英文关键词: metal materials auto-exhaust catalyst Pd-Rh/AlCeZrOx preparation characterization catalytic activity |
| 基金项目:云南省科技计划项目(2017FD213)。 |
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| 中文摘要: |
| 采用溶胶-凝胶法制备了新型Pd-Rh/AlCeZrOx 催化剂。利用N2 物理吸附、X 射线衍射(XRD)、高分辨透射电子显微镜(HR-TEM)、差热-热重分析(H2-TG)和氢气程序升温还原(H2-TPR)技术研究了不同焙烧温度条件下Pd-Rh/AlCeZrOx 催化剂的比表面积、物相结构、储氧量及氧化还原性能。结果表明，该催化剂热稳定性好，储氧量高。800℃焙烧4 h 后，其比表面积和储氧量分别为176.88 m2/g和743.67 μmol/g；1000℃焙烧4 h 后，贵金属颗粒小于10 nm。分别在模拟天然气(CNG)车尾气和汽油车尾气氛围下的整体式小样性能评价表明，该催化剂可用于CNG 车尾气的净化，其最佳空燃比(α)范围为0.978~1.025；也可用于汽油车尾气的净化，最佳空燃比α≈1。 |
| 英文摘要: |
| Novel Pd-Rh/AlCeZrOx catalysts have been successfully fabricated by the sol-gel method. Their texture structure, crystal phase structure and redox ability were characterized by N2 physisorptiondesorption, XRD, HR-TEM, H2-TG and H2-TPR techniques. The results show that Pd-Rh/AlCeZrOx catalysts have high thermal stability and oxygen storage capacity (OSC). High surface area of 176.88 m2/g and OSC of 743.67 μmol/g were obtained for the catalyst calcined at 800℃ for 4 h. The particle size of precious metals is less than 10 nm when the Pd-Rh/AlCeZrOx catalyst was calcined at 1000°C for 4 h. In addtion, their catalytic activity and selectivity were tested in combined gas of stoichiometric-burn CNG vehcle and gasoline car. The results reveal that the Pd-Rh/AlCeZrOx catalysts can be used for purification of the exhaust gas of stoichiometric-burn CNG vehicle, and that the optimum air-fuel ratio is in the range of α=0.978 to 1.025 (α is expressed as excessive air coefficient). The catalysts can also be used for purificaton of the exhaust gas of gasoline car, and the optimum α is about 1. |
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