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Palladium composite membranes reactors

P. Emig, G. Hausinger, F. Schmidt, Factors controlling the performance of catalytic dehydrogenation of ethylbenzene in palladium composite membrane reactors, Chem. Eng. Sd. 1999, 54(10), 1431-1439. [Pg.102]

Quicker, R, Hollein, V. and Dittmeyer, R. (2000) Catalytic dehydrogenation of hydrocarbons in palladium composite membrane reactors. Catalysis Today, 56, 21-34. [Pg.138]

When considering membrane reactors for dehydrogenation and reforming reactions, three types of membrane are of most interest dense palladium or palladium composite membranes,... [Pg.2]

Because Pd-based metal membranes, commonly used for hydrogen separation [11] are not resistant towards sulphur, not much research has been performed on the use of such membranes in H2S dehydrogenation reactors. Some success has, however, been reported by Edlund and Pledger [12], They developed a platinum-based layered metal membrane that could resist irreversible attack by H2S at 700°C. At this temperature a conversion of 99.4% was achieved in the membrane reactor. Without hydrogen removal the conversion was only 13%. No permeance data is provided, but platinum-based metal membranes are known for their low hydrogen permeance [14], Johnson-Matthey developed palladium composite membranes with a hydrogen permeance of about 1 10 mol/m sPa [14], but these are most probably not resis-... [Pg.120]

Gryaznov ct al. [30-32] have done pioneering work in the study of differently designed palladium-alloy membrane reactors for reactions in both gas phase and liquid phase. Most interest was directed to the composition and properties of the membranes, which were decisive questions at this stage of the development, and still are. Selectivity problems in various organic chemical reactions were also of importance to study. [Pg.589]

R. Dittmeyer, Preparation and characterization of palladium composite membranes for hydrogen removal in hydrocarbon dehydrogenation reactors, Catal. Today 2001, 67, 33-42. [Pg.98]

Liang W. Q., Hughes R. 2005. The catalytic dehydrogenation of isobutane to isobutene in a palladium/silver composite membrane reactor. Catalysis Today 104 238-243. [Pg.99]

W. H. Lin, Y. C. Liu and H. F. Chang, Elydrogen production from oxidative steam reforming of ethanol in a palladium-silver alloy composite membrane reactor, J. Chin. Inst. Chem. Eng., 2008, 39, 435-440. [Pg.83]

The design of the Pd-membrane reactor was based on the chip design of reactor [R 10]. The membrane is a composite of three layers, silicon nitride, silicon oxide and palladium. The first two layers are perforated and function as structural support for the latter. They serve also for electrical insulation of the Pd film from the integrated temperature-sensing and heater element. The latter is needed to set the temperature as one parameter that determines the hydrogen flow. [Pg.288]

The main advantages of reactors with composite membrane catalysts arc the higher hydrogen permeability and smaller amount of precious metals in comparison with those presented in Section II. All constructions of the reactors with plane membrane catalyst may be used for composites of thin palladium alloy film and porous metal sheet The design of reactors with composite membranes on polymeric support may be the same as for diffusion apparatus with polymeric membranes (see, for example. Ref. 138). A very promising support for the composite membrane catalysts is hollow carbon fiber [139], once properly thermostable adhesives are found. [Pg.452]

Carbon can block permeation and create porosity at higher temperatures, which is detrimental to both membrane stability and permselectivity [76-79], espedaUy in combination with oxygen [71]. Exposure to unsaturated hydrocarbons at elevated temperatures is particularly detrimental [77, 80]. The formation of carbon on both the membrane and catalyst is promoted in palladium membrane reactors because of the selective removal of hydrogen [81], which necessitates the study of membrane, reactant/product gas mixture, and spedahzed catalyst in concert [51, 82]. For example, a Pd75-Cu25 (aU compositions in this chapter are given in... [Pg.79]

R. Hughes, Composite palladium membranes for catalytic membrane reactors, Membr. Tedmol. 2001, 131(3). 0-13. [Pg.94]

Herman, C., Quicker, P., Dittmeyer, D. (1997). Mathematical simulation of catalytic dehydrogenation of ethyl benzene styrene in a composite palladium membrane reactor. Journal of Membrane Science, 136, 161—172. [Pg.27]

Palladium membrane has been used for selective hydrogen removal in the course of reaction. Such a composite type of reactor, called a membrane reactor, has shown great performance, that is, upsetting the chemical equilibrium for dehydrogenation (Itoh, 1987 Itoh et al., 1992 Matsuda, Koike, Kubo, Kikuchi, 1993 Mondal Ilias, 2001 Raich Foley, 1998 She, Han, Ma, 2001), steam reforming (Galuszka,... [Pg.502]

Paturzo, L., Basile, A. (2002). Methane conversion to syngas in a composite palladium membrane reactor with increasing number of Pd layers. Industrial Engineering Chemistry, 41, 1703. [Pg.517]

Basile, A, Patzuro, L. An experimental study of multilayered composite palladium membrane reactors for partial oxidation of methane to syngas. Catal. Today 2001 67 55-64. [Pg.362]

Kikuchi described a natural gas membrane reactor, which had been developed and operated on a larger scale by Tokyo Gas and Mitsubishi Heavy Industries supplying PEM fuel cells with hydrogen [524]. It was composed of a central burner surrounded by a catalyst bed filled with a commercial nicdcel catalyst. Into the catalyst bed 24 supported palladium membrane tubes were inserted. The membranes had been prepared by electroless plating and were 20-pm thick. Steam was used as a sweep gas for the permeate. The reactor carried 14.5 kg of catalyst. It was operated at 6.2-bar pressure, S/C ratio 2.4 and a 550 °C reaction temperature. The conversion of the natural gas was close to 100%, while the equilibrium conversion was only 30% under the operating conditions used. The retenate composition was 6 vol.% hydrogen, 1 vol.% carbon monoxide, 91 vol.% carbon dioxide and 2 vol.% methane. [Pg.256]

Basile, A. and Paturzo, L. (2001). An Experimental Study of Multilayered Composite Palladium Membrane Reactors for Partial Oxidation of Methane to Syngas, Catal Today, 67, pp. 55-64. [Pg.934]


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