| YSZ-Al2O3的制备及其负载的单钯密偶催化剂的催化性能 | |
| Preparation of YSZ-Al2O3 and Catalytic Performance of Supported Single Palladium Close Coupled Catalysts | |
| 摘要: 采用胶溶法制备了含YSZ(Y2O3稳定的ZrO2，质量比为1∶9)为0，10wt%，15wt%，20wt%，25wt%的YSZ-Al2O3，分别用低温N2吸附-脱附、X射线衍射(XRD)、氨气程序升温脱附(NH3-TPD)技术对它们进行了表征。低温N2吸附结果表明，1 000 ℃焙烧5 h后，钇锆含量为15%的YSZ-Al2O3有最大的比表面积和孔容，分别达到146 m2·g-1和0.41 mL·g-1，孔径分布集中在9~10 nm。XRD结果表明，添加钇锆的氧化铝以γ相存在，钇锆以固溶体形式存在于氧化铝中。以YSZ-Al2O3材料为载体，采用浸渍法制备了Pd含量为2 g·L-1的单钯密偶催化剂。催化剂活性测试结果表明，添加钇锆能有效地提高催化剂对丙烷的催化活性。当钇锆含量达到15%时，催化剂的起燃温度最低，为275 ℃。 | |
| 关键词: 胶溶法 YSZ-Al2O3 起燃温度 单钯密偶催化剂 | |
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| Abstract: Mixed oxides of yttria-zirconia-alumina with 0, 10wt%, 15wt%, 20wt%, 25wt% of YSZ(yttria-stabilized zirconia, yttria:zirconia=1∶9, mass ratio) were synthesized by peptizing method. The prepared products were characterized by low temperature nitrogen adsorption-desorption, X-ray diffraction(XRD), and NH3-temperature programmed desorption(NH3-TPD). Low temperature nitrogen adsorption-desorption results showed that after calcination at 1 000 ℃ the sample with 15%YSZ exhibited the largest specific surface area of 146 m2·g-1 and pore volume of 0.41 mL·g-1, also exhibited narrower pore size distribution centered at 9~10 nm. XRD results revealed that the alumina containing YSZ was γ-alumina, and the YSZ existed as solid solution in alumina. Single palladium close coupled catalysts were prepared by impregnation method, the content of Pd was 2 g·L-1. The results showed that the activity of Pd/YSZ-Al2O3 was superior to that of Pd/Al2O3 when the YSZ was added into the support. While the content of YSZ reached 15%, the prepared Pd catalyst exhibited the lowest light-off temperature of 275 ℃. | |
| Keywords: peptizing method YSZ-Al2O3 light-off temperature single Pd close coupled catalyst | |
| 摘要点击次数: 1400 | |
| 全文下载次数: 1938 | |
| 宋为聪,史忠华,姚艳玲,黎秀敏,陈耀强,龚茂初.YSZ-Al2O3的制备及其负载的单钯密偶催化剂的催化性能[J].无机化学学报,2009,25(5):838-843. | |
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