P. A. Jacobs, M. Tielen, J. Uytterhoeven
Oct 1, 1977
Citations
0
Influential Citations
59
Citations
Journal
Journal of Catalysis
Abstract
2-Propanol and 2-butanol have been dehydrated over alkali cation-exchanged zeolites X and Y. The first reaction was carried out in a differential continuous-flow reactor, the second one in a recirculation reactor, using deuterated alcohols. From isopropanol, propylene and diisopropyl ether are formed as dehydration products. The kinetic data can be fitted to a Langmuir-Hinshelwood equation of the form: r = kKAPA(KAPA + KWPW)−1, where the rate of the reaction is slowed down by the desorption of water. The inter- and intramolecular dehydrations are parallel reactions catalyzed by weak hydroxyl groups. The selectivity is determined by the concentration and acidity of these groups. A detailed reaction mechanism (of the E1 type) is advanced which accounts for the observations.