Comparison of mesoporous solid acid catalysts in the production of DABCO by cyclization of ethanolamine II. Synthesis of DABCO over mesoporous solid acid catalysts

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Abstract

DABCO have been synthesized under vapor phase reaction conditions using ethanolamine in the presence of water over synthesized and characterized Zn-Al-MCM-41 and Al-MCM-41 as catalysts. On increasing the Si/(Zn + Al) ratios of Zn-Al-MCM-41 and Si/Al ratios of Al-MCM-41 catalysts from 75 to 380 and 21 to 104 respectively, the yield and selectivity of DABCO decreased. This may be due to the number of Bronsted acid sites in Zh-Al-MCM-41 and Al-MCM-41 are found to decrease almost linearly with increasing ratios of Si/(Zn + Al) and Si/Al, respectively. Both the Zn-Al-MCM-41 and Al-MCM-41 possesses stronger affinity with ethanolamine and water, but only the conversion of ethanolamine, yield and selectivity of DABCO decreased in recyclable Al-MCM-41. This may be due to decreasing the catalytic activity on the surface of catalysts. In the context, the Si/(Zn + Al) ratio of 75 is found to be more suitable for the cyclization of ethanolamine to highly selective synthesis of DABCO. Thus the yield of DABCO is higher in Zn-Al-MCM-41(75) than that in other Zn-Al-MCM-41 and Al-MCM-41 catalysts.

Original languageEnglish
Pages (from-to)157-162
Number of pages6
JournalMicroporous and Mesoporous Materials
Volume74
Issue number1-3
DOIs
Publication statusPublished - 2004 Sep 20

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials

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