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Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (6): 943.

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Effect of Acid Treatment on the Structure and Acidity of Beta Zeolite

SHEN Jian-Ping1, LI Yue1, SUN Tie1, GUO Jun1, ZHANG Bo1, JIANG Da-Zhen1   

  1. 1. Department of Chemistry, Jilin University, Changchun, 130023;
    2. Research Institute of Petroleum Processing, Beijing;
    3. Keshan Normal College, Keshan
  • Received:1994-08-24 Revised:1995-02-04 Online:1995-06-24 Published:1995-06-24

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Abstract: The effect of acid treatment on the structure and acidity of β zeolite was investigated. It was found that βzeoliteis easily dealuminated by acid treatment,but it can resist 5 mol/L HCl solution.The degree of dealumination is higher than 80% in the 5 mol/L HCl solution.In the acid solution the stability of polymorph(A)is less than that of(B).The chiral of βzeolite can be modified by acid treatment.The results of adsorption, NH3-TPD and pyridine-IR show that the pore volume does not change obviously,the acid strength of sample changes with acid treatment and reaches its maximum in the sample with the Si/Al of 38.8.Lacid is the main acid sites on the surface and increases with increasing the value of Si/Al ratio.

Key words: β-Zeolite, Acid treatment, Polymorph stability, Pore and acidity

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