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ow concentrations [184]. The authors fed hexane as representative for VOC at the one side of t embrane and O2 at the other side. Interestingly, a membrane with intermediate concentration of defe erformed better due to improved contact between the reactants and the catalytic material leading early complete combustion of n-hexane at 210 °C. improved contact between the reactants and the catalytic material leading to nearly complete combustion of n-hexane at 210 ◦C. . Applications in Packed Bed Membrane Reactors (PBMR) 4. ApplicationsinPackedBedMembraneReactors(PBMR) The utilization of permselective zeolite membranes in a direct contact to the catalyst bed, as sho The utilization of permselective zeolite membranes in a direct contact to the nFigure4,caotualdysotfbfedr,saesvsehroawlnadinvaFnigtaugres4,ocvoeurldaloteffrenrasteiverarelacdtvoarnctaognecseopvtse.rOalntertnhaetiovneehand,zeol reactor concepts. On the one hand, zeolite membranes can remove products, catalyst embranes can remove products, catalyst poisons or inhibiting products from the reaction zone in or poisons or inhibiting products from the reaction zone in order to enhance the o enhance the conversion of a given reaction. On the other hand, zeolite membranes might provi conversion of a given reaction. On the other hand, zeolite membranes might provide elective reactant supply from the feed mixture as well as control of the reactant traffic or residence ti selective reactant supply from the feed mixture as well as control of the reactant hus contributtrianffigctorsrelseicdteinvciteytiemneh,atnhcuesmcoenttr.ibuting to selectivity enhancement. Figure 4. Schematic drawing of a packed bed membrane reactor (PBMR). Figure 4. Schematic drawing of a packed bed membrane reactor (PBMR). 4.1. Product Removal: Enhanced Conversions by Shifting the Chemical Equilibrium .1. Product Removal: Enhanced Conversions by Shifting the Chemical Equilibrium Zeolite membranes being able to preferentially transport one or more products from the reaction zone are intimately located to the catalyst bed. The so called Zeolite membranes being able to preferentially transport one or more products from the reaction zo extractor type membrane reactor unit is often utilized in equilibrium limited reactions re intimately located to the catalyst bed. The so called extractor type membrane reactor unit is oft in order to break this limitation and improve the yield of the desired products. tilized in equilibrium limited reactions in order to break this limitation and improve the yield of t However, sufficient permeation and sharp separation, as well as mechanical, thermal and chemical stabilities are considered as crucial membrane requirements for esired products. However, sufficient permeation and sharp separation, as well as mechanical, ther successful application in this membrane reactor mode. Contrarily, by employing nd chemical stabilities are considered as crucial membrane requirements for successful application membranes with poor selectivity, the reaction will suffer from significant reactant his membrane reactor mode. Contrarily, by employing membranes with poor selectivity, the reaction loss. Similarly, low permeation rates will demand increased membrane area that will lead to discrepancies in regard to catalyst volume and higher investment costs. 20 l mc p n 4 w ii md t sm t 4 a u dm a twPDF Image | Zeolite Catalysis
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