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Aldol condensation of butanal over alkali metal zeolites |
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| Authors: | Edward J. Rode Paul E. Gee Linda N. Marquez Tetsuji Uemura Mohammad Bazargani |
| Affiliation: | (1) Department of Chemical Engineering, San Jose State University, 95192 San Jose, CA, USA;(2) Present address: Genus, Inc., 515 Ellis Street, 94043 Mountain View, CA;(3) Present address: Chemical Engineering, University of California, 90024 Los Angeles, CA;(4) Present address: Chemistry Department, University of California, Berkeley, CA |
| Abstract: | Alkali metal zeolites and metal oxides were used for the aldol condensation of n-butanal to 2-ethyl-2-hexenal. The order of activity at 150 °C and 1 atm. was: CsNaY > NaY > LiNaY > MgO >Al2O3. Selectivity to 2-ethyl-2-hexenal was 100% for both pure and mixed isomer feed. Infrared spectroscopic studies showed that stable catalysts were produced by propene pretreatments which blocked Lewis acid sites. Adsorption of ammonia and carbon dioxide on CsNaY during aldol condensation of n-butanal causes a decrease in rate. This result, along with the order of activity, suggests that the presence of both acid and basic sites produce higher activity than strongly basic MgO.Work performed at San Jose State University. |
| Keywords: | Aldol condensation zeolites butanal MgO alumina basic zeolites |
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