高等学校化学学报

高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (2): 254.

• 论文 • 上一篇    下一篇

NiO在USY分子筛、γ-Al2O3及其混合载体上的NO吸附行为和分布规律

牛国兴1, 曹志松1, 李全芝1, 黄曜黄2, 郁芳2   

  1. 1. 复旦大学化学系, 上海 200433;
    2. 复旦大学材料系
  • 收稿日期:1997-11-03 出版日期:1999-02-24 发布日期:1999-02-24
  • 通讯作者: 牛国兴,男,33岁,博士,讲师.
  • 作者简介:牛国兴,男,33岁,博士,讲师.
  • 基金资助:

    国家自然科学基金(批准号:29733070);抚顺石油化工研究院资助

NO Adsorption and the Distribution of NickeLIons on USY Zeolite and γ-Al2O3 and Their Mixture

NIU Guo-Xing1, CAO Zhi-Song1, LI Quan-Zhi1, HUANG Yao2, HUANG Yu-Fang2   

  1. 1. Department of Chemistry, Fudan University, Shanghai, 200433;
    2. Department of Material Science, Fudan University, Shanghai, 200433
  • Received:1997-11-03 Online:1999-02-24 Published:1999-02-24

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摘要： 运用红外技术和高斯函数对红外谱图进行分峰拟合,研究了对NiO在USY分子筛、γ-Al2O3和混合载体上的对NO吸附规律,并推断出不同NiO含量时,Ni2+在这些载体上的分布.结果表明:位于γ-Al2O3表面、USY分子筛SⅡ、SⅠ位和SⅡ位的Ni2+离子吸附NO时,它们的吸附频率分别为1855～1875、1900和1905cm-1.NiO在γ-Al2O3的体相和表面间存在分布平衡,约有75%NiO存在于γ-Al2O3体相中.在USY分子筛上,Ni2+分布于分子筛SⅠ位的趋势远大于SⅡ和SⅡ、SⅠ位.增加NiO含量将增强这种趋势.在混合载体上,Ni2+分布于Al2O3表面的能力大于分布于分子筛的SⅡ和SⅡ、SⅠ位,增加NiO量,分布于γ-Al2O3表面及USY分子筛SⅡ位的Ni2+量显著增加,而分布于分子筛SⅡ、SⅠ位的Ni2+量受其影响较小.

关键词: NO吸附, USY分子筛, &gamma, -Al2O3, NiO, Ni2+分布

Abstract: The distribution of Ni2+ions on USY zeolite, alumina and their mixed carriers is studied according to their NO adsorption. When Ni2+ions locate on SⅡ、SⅡ、(SⅠ')、 sites of USY zeolite or on the surface of alumina, the IRspectra of their NO adsorption show the bands at 1905, 1900 or 1855-1871 cm-1respectively. When NiO loading on NiO/Al-2O-3samples is less than 8%, the Ni2+ion distribution has an equilibrium between the surface and the bulk of γ -alumina. The proportion is about onethird. On USY zeolite, Ni2+ions prefer to occupy its S-Ⅰ sites rather than its S-Ⅱ, S-Ⅱ' and S-Ⅰ' sites. The tendency strengthens obviously with the increase of NiOloading. On MS mixed carriers, more Ni2+ions located on the surface of alumina than on S-Ⅱ and S-Ⅱ', S-Ⅰ' sites of USYzeolite. The number of Ni2+ions on the surface of alumina or on S-Ⅱ',S-Ⅰ' sites of USY zeolite increases greatly with increasing.

Key words: NO adsorption, USY zeolite, γ-lumina, NiO, Distribution of Ni2+

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