In the present work, the direct synthesis of propylene oxide (PO) in the liquid phase is successfully performed
in a packed bed membrane reactor. We show that this engineering device can be implemented
under mild reaction conditions (low temperature and pressure) and outside the explosive regime (low
hydrogen concentration), making it appealing for industrial applications. The ceramic membrane allows
for a separate feed of the reactants, therefore addressing the PO selectivity issue related to the propylene
hydrogenation. The reaction is operated in a continuous methanol flow fed with propylene inside the
tubular membrane; hydrogen and oxygen are fed through the porous material. We observe that the feeding
strategy of the reactants has an important effect on key parameters such as PO selectivity and productivity.
By separating propylene from hydrogen, the propane formation was reduced with respect to
conventional packed bed reactors. Moreover, the addition of small amounts of NaBr to the reaction medium
increases the catalytic activity to PO, but also to propane formation. Therefore, this study provides a
good starting point in the design of a membrane reactor device for the direct synthesis of PO where the
main limitations such as propylene hydrogenation and water formation can be addressed