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eh o e Fy mh Mh h Fo ho m e t a I n u he actions [167,230,231] have been investigated. However, it is the nature of the beast that not all t forementioned reactions can be carried out in CMRs since zeolites simply are not the candidates hoice for all reactions. Figure 8. Schematic drawing of a catalytic membrane reactor (CMR). Figure 8. Schematic drawing of a catalytic membrane reactor (CMR). Xiongfu and coworkers [144] studied the dehydrogenation of ethylbenzene Xiongfu and coworkers [144] studied the dehydrogenation of ethylbenzene to styrene using eith to styrene using either Fe-ZSM-5 or Al-ZSM-5 zeolite membranes synthesized on e-ZSM-5 orpAorl-oZuSs Mα--A5l zOeoltiutbeems ienmCbMraRnse.sGseynetrhaellsyi,ziemdporonvpeodrcoounsvαe-rAsiol2nOc3omtupbaersedintoCtMheRs. Generall 23 proved conversion compared to the conventional reactor configuration was obtained. However, t conventional reactor configuration was obtained. However, the MFI membrane with incorporated Fe species showed better conversion compared to the Al-ZSM-5. FI membrane with incorporated Fe species showed better conversion compared to the Al-ZSM-5. T The authors ascribed the observed effect on the one side to the better adsorption of uthors ascribed the observed effect on the one side to the better adsorption of ethylbenzene on t ethylbenzene on the Fe-ZSM-5 membrane than on its counterpart Al-ZSM-5. On the e-ZSM-5 meomthberahnaendth, athneosntyirtesnecoaudnsoterrpptiaornt Aonl-tZhSe MFe-5Z.SMOn-5tmhemotbhrearnehawnads,lothweesrttyhraetnoenadsorption e Fe-ZSM-5 membrane was lower that on the Al-ZSM-5 membrane, thus ensuring lower carb the Al-ZSM-5 membrane, thus ensuring lower carbon deposition on the membrane and higher ethylbenzene conversion. eposition on the membrane and higher ethylbenzene conversion. The combination of catalytic and separation properties provided by the zeolite The combination of catalytic and separation properties provided by the zeolite membranes has be membranes has been also evaluated in isomerization reactions. Haag et al. [159] lso evaluatepdroipnosiseodmtheruizsaetoiofnH-rZeSaMct-i5ozneso.liHteamagemebtranle.s[s1y5n9th]espirzoepdosnedtopthoefsutasienleosfssHte-eZlSM-5 zeoli embranes synthesized on top of stainless steel disks. Because of their intrinsic acidic propertie disks. Because of their intrinsic acidic properties, catalytically active sites for the isomerization of xylene were provided.The formed p-xylene was selectively separated atalytically active sites for the isomerization of xylene were provided.The formed p-xylene w from the other isomers due to the shape selective properties of the membrane. In electively separated from the other isomers due to the shape selective properties of the membrane. contrast to conventional reactors packed with H-ZSM-5 catalyst, slightly enhanced ontrast to cocnonvveenrtsiionaslanredascetloercstivpitaiceks ewderwe oitbhtaHin-eZdSwMith-5thceamtaelmysbtr,ansleigrehatcltyorecnohnafingcuerdaticoonn. versions a However, the authors pointed out, that difficulties arise, when experimental data electivities were obtained with the membrane reactor configuration. However, the authors pointed o obtained in the two reactor configurations is compared since the kinetic properties of at difficulties arise, when experimental data obtained in the two reactor configurations is compar the two catalytic materials are dissimilar. On the other hand, Tarditi et al. [160] carried isomerization reactions in a membrane reactor with an ion-exchanged Pt/H-ZSM-5 catalytic active membrane and in a membrane reactor equipped with a Ba-ZSM-5 zeolite membrane. Taken as a whole, the two membranes demonstrated reasonably enhanced p-xylene selectivity and yield compared to the conventional fixed-bed reactor packed with Pt/silica-alumina commercial catalyst. The p-xylene yield increased approximately 28% with the help of the Ba-ZSM-5 membrane, while the 36PDF Image | Zeolite Catalysis
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