Deposition of Pd-Ag thin film membranes on ceramic supports for hydrogen purification/separation

• Type: Article in International Scientific Journal
• Date: 2015

Authors

S. C. Rodrigues (Author) FEUP; A. Mendes (Author) FEUP; L. M. Madeira (Author) FEUP; A. I. Pereira (Author) Other; P. Pérez (Author) Other; C. J. Tavares (Author) Other

Journal

Title: Materials Research Bulletin

Vol. 61

Pages: 528-533

ISSN: 0025-5408

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 9 Citations

ISI Web of Science

Scopus - 14 Citations

INSPEC

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Associated Projects

PTDC/EQU-ERQ/098730/2008 - Integração de Reactores de Membrana com Processos Adsorptivos usando-se Catalisadores Suportados em Monolitos para a Produção de Hidrogénio de Elevada Pureza

Other information

Authenticus ID: P-009-Z7G

DOI: 10.1016/j.materresbull.2014.10.055

Abstract (EN): Pd-Ag based membranes supported on porous alpha-Al2O3 (doped with yttria-stabilized zirconia) were studied for hydrogen selective separation. Magnetron sputtering technique was employed for the synthesis of thin film membranes. The hydrogen permeation flux is affected by the membrane columnar structure, which is formed during deposition. From scanning electron microscopy analysis, it was observed that different sputtering deposition pressures lead to distinct columnar structure growth. X-ray diffraction patterns provided evidence of a Pd-Ag solid solution with an average crystallite domain size of 21 nm, whose preferential growth can be altered by the deposition pressure. The gas-permeation results have shown that the Pd-Ag membrane supported on porous alpha-Al2O3 is selective toward H-2. For optimized membrane synthesis conditions, the permeance toward N-2 is 0.076 x 10(-6) moi m(-2) s(-1) pa(-1) at room temperature, whereas for a pressure difference of 300 kPa the H-2-flux is of the order of ca. 0.21 mol m(-2) s(-1), which corresponds to a permeance of 0.71 x 10(-6) mol m(-2) s(-1) Pa-1, yielding a selectivity of alpha (H-2/N-2) = 10. These findings suggest that the membrane has a reasonable capacity to selectively permeate this gas. (C) 2014 Elsevier Ltd. All rights reserved.

Language: English

Type (Professor's evaluation): Scientific

Notes: Publicação abrangida pelo Journal Citation Reports 2015

No. of pages: 6