- 作者: 簡淑華; 呂光烈; 黃小文
- 作者服務機構: Institute of Chemistry, Academica Sinica, Nankang, Taipei, Taiwan 115, R.O.C.
- 中文摘要: We have made a comparative study of CO/H/sub 2/ reactions over the nickel catalysts supported on X- and Y-zeolites, prepared by incipient-wetness impregnation (W) and ion-exchange (E) methods. The catalysts were characterized by surface area and volumetric chemisorption measurement, temperature programmed reduction profiles, and x-ray diffraction analysis. The results show that the turnover frequency decreases in the order: NiX(W)>NiY(W)>NiY(E)>NiX(E). The metal dispersion and catalytic activity of the catalyst are mainly affected by the support materials, the preparation methods, and the activation procedures. The high activity of NiX(W) was due to its higher reducibility, smaller nickel crystalline size, and better nickel dispersion. The low activity of NiX(E) was attributed to the poor ion-exchange of Ni with NaX, the poor reducibility, the large crystalline size, and the poor nickel dispersion.
- 英文摘要: --
- 中文關鍵字: Ni/zeolite; characterization; CO/H/sub 2/ reactions.
- 英文關鍵字: Ni/zeolite; characterization; CO/H/sub 2/ reactions.