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.
Bibliographical noteFunding Information:
The authors gratefully acknowledge the Korea Research Foundation for sponsoring this work (KRF-2003-005-D00002).
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials