高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (8): 1199.

• 论文 • 上一篇    下一篇

MoO3/γ-Al2O3混合物中MoO3表面转化反应的TDPAC研究

孙桂大1, 于廷云1, 闰富山1, 任立国1, 倪新伯2   

  1. 1. 抚顺石油学院石油化工系, 抚顺, 113001;
    2. 中国科学院上海原子核研究所
  • 收稿日期:1993-10-04 修回日期:1994-01-31 出版日期:1994-08-24 发布日期:1994-08-24
  • 通讯作者: 孙桂大,男,52岁,硕士,教授.
  • 作者简介:孙桂大,男,52岁,硕士,教授.
  • 基金资助:

    中国科学院核分析技术联合开放研究实验室资助

A Study of Surface Conversion of Mo03 on γ-A1203 in Physical Mixtures by TDPAC

SUN Gui-Da1, YU Ting-Yun1, YAN Fu-Shan1, REN Li-Guo1, NI Xin-Bo2   

  1. 1. Departnrent of Petrochemical Engineering, Fushun Petroleum Institute, Fushun, 113001;
    2. Shanghai Instrtute of Nuclear Research, Academia Sinica, Shanghai, 201800
  • Received:1993-10-04 Revised:1994-01-31 Online:1994-08-24 Published:1994-08-24

摘要: 采用时间微分扰动角关联技术通过测定99Mo(β-)99Tc的核电四极矩相互作用研究了MoO3/γ-Al2P3机械混合物热处理过程中载体表面上MoO3的变化情况。在一定的热处理条件下,MoO3在γ-Al2O3表面上可转化为类似的表面聚合物,并进一步转变为加氢脱硫活性中心前身态。适量水蒸汽的存在有利于这一转化,过量水蒸汽则具有抑制作用,无水蒸汽时转化很慢。高温时水与MoO3生成的中间化合物MoO2(OH)2在MoO3转化过程中可能起到一定作用。延长热处理时间和提高温度均有利于MoO3在载体表面上的转化。

关键词: 三氧化钼, 氧化铝, 表面反应, 时间微分扰动角关联技术

Abstract: The nuclear ctuadrupole interaction of 99Mo(β-)99Tc in calcined MoO3/Y-A1203 mixtures was measured by time differential perturbed angular correlation (TDPAC) and used for studying the surface conversion of MoO3 on γ-Al2O3 during thermal treatment. MoO3 on γ-Al203 surface can be conveted to Mo7O246- (HM)-like Mo species, which can be further converted to the precursor of the active HDS sites (surface polymolybdate species) via the intermediate MoO2(OH)2 formed at high temperature. Water vapour with the suitable amount, the time period and temperature of thermal treatment increasing are in favour of the transfor-mation of MoO3. The presence of excess water vapour inhibits the transformation and with-out water vapour, MoO3 is difficult to be converted.

Key words: MoO3, Al2O3, Surface reaction, Time differential perturbed angular correlation (TDPAC)

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