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Titolo:
Separation of hydrogen from gas mixtures using supported platinum-group metal membranes
Autore:
Uemiya, S; Kato, W; Uyama, A; Kajiwara, M; Kojima, T; Kikuchi, E;
Indirizzi:
Seikei Univ, Fac Engn, Dept Ind Chem, Musashino, Tokyo 1808633, Japan Seikei Univ Musashino Tokyo Japan 1808633 Musashino, Tokyo 1808633, Japan Waseda Univ, Sch Sci & Engn, Dept Appl Chem, Shinju Ku, Tokyo 1698555, Japan Waseda Univ Tokyo Japan 1698555 pl Chem, Shinju Ku, Tokyo 1698555, Japan
Titolo Testata:
SEPARATION AND PURIFICATION TECHNOLOGY
fascicolo: 1-3, volume: 22-3, anno: 2001,
pagine: 309 - 317
SICI:
1383-5866(20010301)22-3:1-3<309:SOHFGM>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
POROUS STAINLESS-STEEL; PERMEATION PROPERTIES; COMPOSITE MEMBRANES; ALUMINA MEMBRANES; PALLADIUM; STABILITY; SURFACES;
Keywords:
carbon monoxide; CVD; hydrogen permeation; metal membrane; poisoning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Uemiya, S Seikei Univ, Fac Engn, Dept Ind Chem, 3-3-1 Kichijoji Kita Machi, Musashino, Tokyo 1808633, Japan Seikei Univ 3-3-1 Kichijoji Kita Machi Musashino Tokyo Japan 1808633
Citazione:
S. Uemiya et al., "Separation of hydrogen from gas mixtures using supported platinum-group metal membranes", SEP PURIF T, 22-3(1-3), 2001, pp. 309-317

Abstract

Supported metal membranes consisting of a thin layer of various precious metals deposited in the pores of a tubular porous ceramic substrate were fabricated using a CVD technique, where the corresponding Bis(acelyl-acetonato) complexes were selected as the CVD precursors. These membranes showed high H-2 fluxes comparable to the Pd composite membrane prepared by an electroless-plating technique as well as relatively high pennselectivities of H-2 over N-2. A possible gas transport mechanism of the CVD membranes may be the surface diffusion mechanism in which H-2 is selectively adsorbed on the metal surface and diffuses at a relatively high rate. The practical performance for II, separation from a two-component mixed gas, especially a gas mixture including a gas strongly adsorbed on metal surface such as carbon monoxide (CO), was investigated. H-2 fluxes through the tested CVD non-Pd membranes were drastically decreased. The poisoning effect of CO appeared in thefollowing order: Rh > Pt > Ir > Ru, which is not completely consistent with the order of the heat of CO adsorption (Ir > Pt > Ph much greater than Ru). The poisoning effect cannot be understood only from a thermodynamic viewpoint. Fortunately, the H-2 permeance of all tested membranes was almost totally restored after the CO was completely removed from the gas phase, indicating that most of the CO was reversibly adsorbed on the metal surface at H-2 separation temperatures. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/04/20 alle ore 02:18:37