| 特木勒,寇元.担载Ni2（C5H5）2（CO）2催化剂的EXAFS表征[J].分子催化,1992,(5):328-338 |
| 担载Ni2（C5H5）2（CO）2催化剂的EXAFS表征 |
| EXAFS Characterization of Supported Nickel Catalysts Prepared from |
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| DOI： |
| 中文关键词: 催化剂 镍 络合物 制备 |
| 英文关键词:Supported catalyst, Ni complex, EXAFS, Dispersty. |
| 基金项目: |
| 特木勒 寇元 |
| 中国科学院兰州化学物理研究所，中国科学院兰州化学物理研究所，中国科学院兰州化学物理研究所，中国科学院兰州化学物理研究所，日本京都大学化学系，日本高能物理研究所 兰州 730000 中国科学院兰州化学物理研究所，羰基合成与选择氧化国家重点实验室，兰州 730000，兰州 730000 中国科学院兰州化学物理研究所，羰基合成与选择氧化国家重点实验室，兰州 730000，兰州 730000 中国科学院兰州化学物理研究所，羰基合成与选择氧化国家重点实验室，兰州 730000，兰州 730000 中国科学院兰州化学物理研究所，羰基合成与选择氧化国家重点实验室，兰州 730000 |
| 摘要点击次数: 1099 |
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| 中文摘要: |
| 以Ni_2Cp_2(CO)_2(Cp=C_5H_5)为催化剂母体化合物,γ-Al_2O_3,SiO_2为担体制备了担载型镍催化剂,对母体化合物及热分解处理前后的催化剂样品在同步辐射装置上进行了外延X-光精细结构(Extended X-ray Absorpdon Fine Structure)测定,以先进的球面波理论对实验结果进行拟合,标样拟合结果与文献XRD完全一致。催化剂的EXAFS表征结果表明,母体化合物与氧化物担体表面发生了较强的化学作用,镍组分具有较高的分散度,镍在氧化硅表面存在Ni[(O)_8]_n,Ni—Ni两种配位,而在氧化铝表面几乎只存在Ni[(O)s)_n配位,催化剂上Ni—Ni键长比母体化合物Ni—Ni键长增加0.01nm左右,Ni—Ni键的伸长及其配位状态可能对其催化行为有重要影响。 |
| 英文摘要: |
| Supported nickel catalysts were prepared from Ni2Cp2 (CO) 2 (Cp = C5H5) as the precursor compound and alumina as well as silica as the supports. The EXAFS (Extended X-ray Absorption Fine Structure) spectra of the precursor compound and the catalysts were measured on a synchrotron radiation apparatus (BL-10B Station) of the Photon Factory of Japan. The EXAFS data analysis was done on SUN 386/P9 micro-computer with the Program Library for EXAFS Data Processing in which the spherical wave theory was used. Correlation between the EXAFS parameters and error bars of the fitted results were also calculated. The result of EXAFS characterization, of the Ni2Cp2(CO)2 was exactly the same as the reported XRD data. The EXAFS results of the catalysts indicated that the precursor compound strongly interacted with the oxide supports. On the surface of silica, nickel atom was coordinated by surface oxygen atoms(Ni[(O)s]3) and another nickel atom(Ni-Ni), but the nickel atom was only coordinated by surface oxygen atoms (Ni[(O)s]4) on the surface of alumina. These differences were ascribed to the different surface properties of the supports. The Ni-Ni distance of the catalysts was about 0. 25 nm, which was about 0. 01 nm longer than the Ni-Ni distance in the precursor compounds. Such increase in the Ni-Ni distance may have important effect on the catalytic behavior of the catalysts. |
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