Abstract
The usage of a microreactor system for the direct epoxidation of propene over a gold-titania-based catalyst system using a mixture of hydrogen, oxygen, and propene allows for the safe operation of the reaction in the explosive regime. A kinetic study was performed on the effect of the concentration of hydrogen, oxygen, and propene on the reaction rate as well as the catalyst deactivation and reactivation. A simple algebraic expression was developed, based on published kinetics, which provided the three reaction rate constants as a function of the feed gas concentrations. It is shown that the propene concentration does not influence the propene oxide formation rate; however, higher propene concentrations significantly reduce the catalyst deactivation rate. Hydrogen increases the rate of the epoxidation reaction, while it only has a minor influence on the rate of deactivation and reactivation. Oxygen has a beneficial effect on the epoxidation reaction: it slightly decreases the deactivation rate and is beneficial for the catalyst reactivation. It is shown that, for the gold on titania dispersed on a silica catalyst used in this study, it is advantageous to perform the direct propene epoxidation in a microreactor system at the highest possible feed concentrations for each of the reactants. This results in the highest propene oxide productivity and the lowest deactivation rate.
Original language | English |
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Pages (from-to) | 10479-10485 |
Number of pages | 6 |
Journal | Industrial and Engineering Chemistry Research |
Volume | 49 |
Issue number | 21 |
DOIs | |
Publication status | Published - 2010 |
Event | 21st International Symposium on Chemical Reaction Engineering (ISCRE 21) - Philadelphia, PA, United States Duration: 13 Jun 2010 → 16 Jun 2010 |