Volume 39 Issue 11
Nov.  2011
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LI  Ning, LU Cui-Yun, XU Dong-Sheng, HU  Yi, HAN Yu-Wang. Effects of F/Nb mol ratio of F-Nb/HZSM-5 catalyst on the catalytic performance for ethanol dehydration to ethylene[J]. Journal of Fuel Chemistry and Technology, 2011, 39(11): 850-855.
Citation: LI  Ning, LU Cui-Yun, XU Dong-Sheng, HU  Yi, HAN Yu-Wang. Effects of F/Nb mol ratio of F-Nb/HZSM-5 catalyst on the catalytic performance for ethanol dehydration to ethylene[J]. Journal of Fuel Chemistry and Technology, 2011, 39(11): 850-855.

Effects of F/Nb mol ratio of F-Nb/HZSM-5 catalyst on the catalytic performance for ethanol dehydration to ethylene

  • Received Date: 2010-12-03
  • Rev Recd Date: 2011-04-17
  • Publish Date: 2011-11-30
  • The structures and surface acidities of F-Nb/HZSM-5 catalysts with different F/Nb mol ratio were studied using BET, NH3-TPD, FT-IR, MAS-NMR and SEM. The catalytic performance of these catalysts for ethanol dehydration to ethylene was evaluated and correlated with the characterization results. It is found that, dealumination of HZSM-5 occurred after modification and the depth of dealumination increased with the increase of the amount of F added. The extra-framework aluminum species were observed by 27Al MAS NMR with a signal appeared at -13.5. With the increase of F/Nb mol ratio, both weak and strong acid amounts decreased and a new strong acid site was found in the NH3-TPD profile at 500℃. The catalyst with F/Nb mol ratio of 0.7 gave the highest catalytic activity and selectivity. The stability of the catalyst was greatly improved by the addition of F-Nb.
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