Mixed conducting membrane reactors

Sammells AF, Barton TF, Peterson DR, Harford ST, Mackay R. Methane conversion to syngas in mixed-conducting membrane reactors. Proceedings of the 4th International Conference on Catalysis in Membrane Reactors, Zaragoza, Spain, 3-5 July 2000. 

CELLULOSE-PRECURSOR SYNTHESIS OF ELECTROCAT ALYTICALLY ACTIVE COMPONENTS OF SOFCs AND MIXED-CONDUCTING MEMBRANE REACTORS... 

Components Of SOFCs And Mixed-Conducting Membrane Reactors... 

Zhang, C., Chang, X. F., Jin, W. Q., Xu, N. P. (2008). The oxidative stream reforming of methane to syngas in a thin tubular mixed-conducting membrane reactor. Journal of Membrane Science, 520(1—2), 401—406. 

Zhang, C., Chang, X., Dong, X., et al. (2008). The Oxidative Stream Reforming of Methane to Syngas in a Thin Tubular Mixed-Conducting Membrane Reactor, J. Membrane Sci., 320, pp. 401-406. 

Delbos, C., Lebain, G., Richet, N., et al. (2010). Performances of Tubular Lao.8Sro.2Fco.7 Gao.303 8 Mixed Conducting Membrane Reactor for under Pressure Methane Conversion to Syngas, Catal. Today, 156, pp. 146-152. 

Advanced Zero Emissions Plant (AZEP). In the AZEP concept, the conventional combustion chamber in a GT is substituted by a mixed conducting membrane (MCM) reactor that combines oxygen production, fuel combustion, and heat transfer. A sketch of the AZEP concept is shown in Figure 11.13.19... 

Decreasing operation temperature of solid oxide fuel cells (SOFCs) and electrocatalytic reactors down to 800-1100 K requires developments of novel materials for electrodes and catalytic layers, applied onto the surface of solid electrolyte or mixed conducting membranes, with a high performance at reduced temperatures. Highly-dispersed active oxide powders can be prepared and deposited using various techniques, such as spray pyrolysis, sol-gel method, co-precipitation, electron beam deposition etc. However, most of these methods are relatively expensive or based on the use of complex equipment. This makes it necessary to search for alternative synthesis and porous-layer processing routes, enabling to decrease the costs of electrochemical cells. Recently, one synthesis technique based on the use... 

Figure 5.5 Principles of dense ceramic membrane reactors (a) electrochemical pump membrane reactor (EP-MR) (b) solid oxide fuel cell membrane reactor (SOEC-MR) (c) mixed ionic-electronic conducting membrane reactor (MIEC-MR).

Figure 9.4 Simplified sketch of the mixed conducting oxygen-separation membrane reactor part in the AZEP concept, after [20], Second combustor placed before the turbine improves efficiency, but also increases C02 emission.

J.E. ten Elshof, H.J.M. Bouwmeester and H. Verweij, Oxidative Coupling of Methane in a Mixed-Conducting Perovskite Membrane Reactor , Appl. Catal. A, 130 195-212 (1995). 

Today, the majority of research investigations into CMRs are being conducted by many institutions, in addition to oil and chemical and utilities companies [5]. The use of mixed ionic-electronic membrane reactors for the partial oxidation of natural gas is undergoing active development by a number of consortia based around Air Products and Chemicals (USA), Praxair (USA), and/or Air Liquide (France). At present, the development of CMRs involving a pure ion-conducting electrolyte is restricted to a few reports of conceptual systems [12, 95]. 

Some of the many different types of catalysts which have good catalytic properties for the OCM reaction qualify as membrane materials. Membrane reactors for OCM were designed and tested by Nozaki et al. (1992). Three kinds of reactors were developed the first one consisted of a porous membrane covered with a thin film of catalyst (type I) the second one, a dense ionic-conducting membrane (non porous) with catalytic layer (type II) and the third one was a membrane made of perovskite-type mixed oxides which was active for OCM (type III). Figure 11 presents the diagram for the membrane reactor system and table 13 shows the different materials used for supports and coated catalysts. 

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