Porous membranes are used as catalysts for selective extraction of single components, controlled dosing of a reactant, and to intensify the contact between reactants to increase the reaction rate.  The manufacture of these catalytic membrane reactors faces several challenges including the preservation of a very high surface area while ensuring mechanical stability. Depending on the application, a specific pore size, permeability, or hierarchical structure may also be desired. Capillary suspensions have been used to easily create porous bodies with very high porosities at small pore sizes. This process will be adapted to use highly porous particles where the wetting of the secondary fluid and sintering parameters must be carefully controlled so as not to reduce the total surface area or damage the surface chemistry of active particles.