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the traditional reactor mainly attributed to the selective removal of CH3OH via the zeolite membrane. Moreover, the authors stressed the positive aspect of the reduced energy demand since the membrane reactor was able to reach the CO2 conversions of the traditional reactor at milder conditions (e.g., PBMR operating at H2/CO2 = 3 and temperature of 225 ◦C could reach the conversion of conventional reactor operating Figure 5. Water gas shift (WGS) reaction in a MFI zeolite membrane reactor (sweep: N2, at at 265 ◦C). Furthermore, as stated by the authors the temperature seems to be the −1 atmiomsphoerrtiacnpt rpersoscuerses, WpaHraSmVetaetr7i5n0t0heh PBaMndRroatpioeroaftiHon2Osi/nCcOe t=he3.m5)e:tIhnafnluoelnsceepaorfarteioacntion presisumreaianldy tdeumepteoraitusrceaopnillCarOy convdernsisoantio(χn in),sihdyedtrhogeepnorecsosvoertyhatexceaenddinpgerthmeeate sidecrHit2icaolntceemnptreartaiotunreγof me.tRhaenporilnwteidllwshitahrpleyrmreidssuiocentfhroemse[p1a5r4a]ti.on efficiency. , Figure 6. Schematic illustration of a WGS membrane reactor with modified Figure 6. Schematic illustration of a WGS membrane reactor with modified hollow fibre hollow fibre MFI zeolite membrane swept by steam applied in a counter-diffusion MFI zeolite membrane swept by steam applied in a counter-diffusion towards the reaction towards the reaction side. Reprinted with permission from [157]. Copyright (2015) side. Reprinted with permission from [157]. Copyright (2015) John Wiley and Sons. John Wiley and Sons. 4.1.4. Hydrogen Permeation in Syngas Production 4.1.6. Metathesis of Propene The benefitTohfeusesliencgtizveoplirtoicduPcBtMremRsovoavleirntthheeterqaduitliobnriaulmfixliemd-itbeeddmreatactohreshisasofaplsropbeneen reported to ethene and 2-butene as well as from the simultaneous occurring geometrical by Liu et al. [215,216] for selective product permeation in CO2 reforming of methane for syngas isomerization of cis-2-butene into trans-2-butene was evaluated by the mean of production. The authors employed a combination of catalytic composite zeolite membranes either a membrane reactor equipped with a silicalite-1 zeolite membrane supported on stainless steel and 16.4 wt. % Re2O7/γ-Al2O3 as catalyst [93,94]. The studied reactor benefited from the use of the membrane twice since (i) 13% absolute improvement of the propene conversion compared to the equilibrium value (25.4%) and (ii) 32% increase in the trans-2-butene/cis-2-butane ratio compared to the equilibrium ratio being 3.2 due to the preferential permeation of trans-2-butene were achieved. 30PDF Image | Zeolite Catalysis
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