| 许峥,张继炎.超细镍基催化剂的CH4—CO2重整反应性能——Ⅲ制备方法对催化剂吸附CO2性能的影响[J].分子催化,2001,(5):346-350 |
| 超细镍基催化剂的CH4—CO2重整反应性能——Ⅲ制备方法对催化剂吸附CO2性能的影响 |
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| 修订日期：2000-08-18 |
| DOI： |
| 中文关键词: CO2 吸附 程序升温脱附 气凝胶超细粒子 镍基催化剂 氧化镧 改性 甲烷 二氧化碳 催化重整 合成气 制备 性能 |
| 英文关键词:Adsorption of CO 2,Temperature programmed desorption,Superfine aerogel,Nickel based catalyst,La 2O 3 modifier,CH 4 CO 2 reforming |
| 基金项目:高等学校博士学科点专项科研项目，国家重点实验室基金，97005617，KF98009，， |
| 许峥 张继炎 |
| [1]天津大学化工学院催化科学与工程系，天津300072 [2]天津大学一碳化工国家重点实验室，天津300072 |
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| 中文摘要: |
| 采用溶胶－凝胶法和超临界干燥技术，制备了气凝胶超细氧化铝载体、超细二元（NiO-Al2O3）和三元（NiO-La2O3-Al2O3）催化剂，同时以超细氧化铝载体浸渍镍盐的二元催化剂和普通氧化铝浸渍的镍镧铝的三元催化剂作为对比。通过CO2－TPD实验及XRD、XPS和IR技术表征，考察了制备方法和氧化镧改性对催化剂吸附二氧化碳能力的影响。结果表明，超细样品的吸附能力明显高于浸渍型催化剂，具有明显的纳米粒子效应，La2O3的加入，提高了强碱中心数，使催化剂的吸附能力显著增强，且不受制备方法的影响，还原后的镍物种吸附CO2后，与载体之间的相互作用被消弱，容易被重新氧化成粒度较大的氧化镍晶粒。 |
| 英文摘要: |
| The adsorption of CO 2 and its effect on nickel based catalysts prepared by sol gel method and supercritical drying technique or ordinary wet impregnation and thermal drying were carefully investigated by means of CO 2 TPD experiment, XRD, XPS and techniques. The superfine alumina aerogel support and NiO Al 2O 3, NiO La 2O 3 Al 2O 3 aerogel catalysts show very high adsorption capacity of CO 2 comparing with ordinary ones, which is thought to be beneficial to their activity for CH 4 CO 2 reforming and the resistance to carbon deposition. In addition, the addition of La 2O 3 is very useful for increasing the active sites due to its strong interaction with CO 2. The reduced Ni species can be reoxidized into oxidized state with large particle size during the adsorption of CO 2, at the same time, the interaction of metal with support has been substantially weakened. |
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