METHANOL AROMATIZATION PERFORMANCE OF ZSM-5 MODIFIED BY NaAlO2

Abstract

Abstract:

ZSM-5 zeolite was modified successively by sodium aluminate and HCl washing with a calcination between the two steps. The samples were characterized by XRD, SEM, NH3-TPD, N2 adsorption, ICP-OES, and TG techniques. The results show that mesopores were created, and a higher solid yield was obtained with the crystallinity, acidity and micropore volume largely preserved. Besides, the calcination before acid washing is in favor of eliminating the pore blocking and recovering the acidity. The methanol aromatization performance over the modified catalysts was investigated at the conditions of 400 ℃, 0.15 MPa and the weight hourly space velocity of 1.9 h-1. The ZSM-5 zeolite modified with 0.45 mol/L NaAlO2 presents the optimal performance. The aromatics yield reaches 41.9% and BTX yield is 32.7%, increased by 3.8 and 4.4 percentage points compared with catalytic activity of parent ZSM-5, respectively. Meanwhile, the modified catalyst’s lifetime is 30h, one more times than the parent zeolite.

Key words: ZSM-5, NaAlO2, mesoporous, methanol, aromatization

References

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