Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (18): 1781-1786.     Next Articles

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  1. (1江苏技术师范学院化学化工学院 常州 213001)
    (2中国科学院山西煤炭化学研究所 太原 030001)
  • 投稿日期:2010-02-11 修回日期:2010-04-28 发布日期:2010-05-17
  • 通讯作者: 刘维桥
  • 基金资助:


Physicochemical and Isomerization Property of Zn-Pt/SAPO-11 Catalysts Promoted by Zn

Liu Weiqiao*,1 Lei Weining1 Liu Ping2 Shang Tongming1 Ren Jie2 Sun Yuhan2   

  1. (1 School of Chemistry and Chemical Engineering, Jiangsu Teachers University of Technology, Changzhou 213001)
    (2 Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001)
  • Received:2010-02-11 Revised:2010-04-28 Published:2010-05-17
  • Contact: LIU WeiQiao

Monometallic catalyst Pt/SAPO-11 was prepared by impregnation method. Bimetallic catalyst Zn-Pt/SAPO-11 was prepared by sequential impregnation method. X-ray diffraction (XRD), nitrogen adsorption, temperature-programmed desorption of ammonia (NH3-TPD) and Fourier transform infrared spectroscopy (FT-IR) techniques were employed to analyze the natures of catalysts. The results show that the BET surface areas, porous volume and the number of Bronsted acid decrease slightly with the addition of metal additive Zn. However, the addition of additive Zn leads to an increasement in the number of Lewis acid and the total acidity of the catalyst. In addition, the catalytic performances of catalysts for the hydroisomerization of n-heptane at 300~380 ℃ were studied. The conversion of n-heptane is varied significantly and the selectivity of C7 isomers is not obviously affected by the addition of Zn to Pt/SAPO-11 catalyst. A maximum n-heptane conversion and C7 isomers yield over the Zn-Pt/SAPO-11 catalyst containing 0.2 wt% Zn and 0.2 wt% Pt is observed. However, further increase in Zn addition leads to a fall in the n-heptane conversion and C7 isomers yield. The results show that the synergistic effect between metallic function and acid function is very important for the bifunctional catalyst over the n-heptane hydroisomerization reaction.

Key words: Pt/SAPO-11 catalyst, Zn, n-heptane, hydroisomerization