Chinese Journal of Magnetic Resonance ›› 1999, Vol. 16 ›› Issue (3): 207-210.

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CHARACTERIZATION OF COKE DEPOSITED ON Hβ ZEOLITE CATALYST DURING ALKYLATION OF ANILINE BY NMR

Ai Xuanjun1, Zhou Jianwei1, Ye Chaohui1, Wang Jingzhong2, Wang Lijun4, Wang Xu3, Guo Zhenya4   

  1. 1. State Key Laboratory of Magenetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, The Chinese Academy of Sciences, Wuhan 430071;
    2. Department of Chemistry, Nankai Univ., Tianjin, 300071;
    3. Catalyst Factory, Nankai Univ., Tianjin, 300071;
    4. Department of Physics, Nankai Univ., Tianjin, 300071
  • Received:1999-02-08 Revised:1999-04-02 Published:1999-06-05 Online:2018-01-11

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Abstract: Coke deposited on Hβ-zeolite in the alkylation reactions of aniline and isopropanol at different temperatures (350-500℃) has been studied by 13C CP/MAS NMR and thermal analysis methods. The results showed that the composition and weight of coke are strongly dependent on the reaction temperature. At the lower temperture (350℃), the coke is deposited slowly and the constituents are partly alkylenes and partly polyaromatic carbons(condensed ring compounds). However, at the higher temperature, the coke is deposited quickly and the constituent is mainly high polyaromatics.

Key words: Hβ-zeolite, Alkylation of aniline, Coke, 13C CP/MAS NMR

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