Membrane for methane conversion

Bouwmeester HIM Dense ceramic membranes for methane conversion. Catal Today. 2003 82 141. 

Bouwmeester, H.J.M., 2003. Dense Ceramic Membranes for Methane Conversion. Catalysis Today, 82(1-4) 141-150. 

Fig. 11.4. Top figure shows the effect of pressure on the reaction side of the membrane cm methane conversion in the Pd membrane reactor bottom figure shows the effect of temperature. The solid line and the sjmtibols (o) are for the Pd membrane reactor. The dotted line is the calculated equilibrium conversion and the symbols ( ) are for a membrane reactor using a porous Vycor glass membrane. Reproduced from Uemiya et al. [29] with permission.

The present work was focused on the synthesis of nanocrystalline components for electrochemical cells via the cellulose-precursor technique. This method was used to prepare nanostructured intermediate-temperature (IT) SOFC anodes made of a series of cermets comprising gadolinia-doped ceria (CGO), yttria-stabilized zirconia (YSZ), Gdi.86Cao.i4Ti207.5 (GCTO) pyrochlore, metallic nickel and copper. Perovskite-type SrFcojAlo.sOs.s (SFA) powder, also obtained via the cellulose precursor, was applied onto membranes of the same composition to enhance specific surface area and electrocatalytic activity in the reactors for methane conversion [3]. 

Shao Z, Dong H, Xiong G, Cong Y and Yang W (2001), Performance of a mixed-conducting ceramic membrane reactor with high oxygen permeability for methane conversion , / Memhrane Sci, 183,181-192. 

Wu Z, Wang B and Li K (2010), A novel dual-layer ceramic hollow fibre membrane reactor for methane conversion ,/ Membrane Sci, 352,63-70. 

De Falco M, laquanieUo G and SaUadini A (2011b), Reformer and membrane modules (RMM) for methane conversion experimental assessment and perspectives of said innovative architecture , ChemSusChem,4,1157-1165. 

Figure 5.37 Effect of reaction pressureon methane conversion for methane steam reforming in membrane reactors with different types of membranes reaction temperature 500°C S/C ratio 3 A, thermodynamic equilibrium , conversion in a membrane reactor with porous ceramic membrane 0, methane conversion in a membrane reactor with dense palladium membrane [406].

An interesting work on perovskite membrane reactors has been reported by Liao et al, who prepared a U-shaped BCFT based membrane and tested it for methane conversion. The membrane has been prepared by phase inversion after spinning a hollow fiber membrane [73]. The picture of the setup used in their work is shown in Figure 33.21. 

While the results of the study of Liao et al are in line with those reported in the literature, again demonstrating that air separation can be coupled with membrane reactors for methane conversion, the interesting result of the work is indeed the possibility to prepare, seal, and operate a U-shaped perovskite membrane. In fact, by using this configuration, one can think of producing longer... 

Liao, Q., Chen, Y., Wei, Y., Zhou, L., and Wang, H. (2014) Performance of U-shaped BaCoo.7Feo.2Tao.i03 8 hollow-fiber membranes reactor with high oxygen permeation for methane conversion. 

Shao, Z., Dong, H., Xiong, G., et al. (2001). Performance of a Mixed-Conducting Ceramic Membrane Reactor with High Oxygen Permeability for Methane Conversion, J. Membrane Set, 183, pp. 181-192. 

Wu, Z., Wang, B. and Li, K. (2010). A novel Dual-Layer Ceramic Hollow Fibre Membrane Reactor for Methane Conversion, J. Membrane Sci., 352, pp. 63-70. 

For dry reforming, carbon formation is very likely, especially when carried out in a membrane reactor [24]. For this application noble metals are used, which are intrinsically less prone to carbon formation because, unlike nickel, they do not dissolve carbon. Irusta et al. [24] have shown above-equilibrium methane conversion in a reactor equipped with a self-supported Pd-Ag tube. Small amounts of coke were formed on their Rh/La203/Si02 catalyst, but this is reported not to have any effect on activity. 

Balachandran et al. (1997) SEM Perovskites (oxides of Sr, Fe, and Co) Phase formation in membrane reactors + + + Oxygen storage for methane-syn gas conversion... 

Using nearly straight-pore alumina membrane plates as both a separator and a catalyst, Fumeaux et al. [1987] demonstrated the dehydration of isopropanol to form propene and hydrogenolysis of ethane to make methane. No quantitative information, however, was provided for the conversion or yield of the associated reactions. 

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