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Selective Deposition of Pd on Porous Alumina Support Using Supercritical CO2

Published online by Cambridge University Press:  11 February 2011

Masahiko Matsukata ,
Takashi Nishizuka ,
Yasushi Sekine  and
Eiichi Kikuchi
Masahiko Matsukata
Affiliation:
Department of Applied Chemistry, Waseda University, 3–4–1 Okubo, Shinjuku-ku, Tokyo 169–8555, Japan
Takashi Nishizuka
Affiliation:
Department of Applied Chemistry, Waseda University, 3–4–1 Okubo, Shinjuku-ku, Tokyo 169–8555, Japan
Yasushi Sekine
Affiliation:
Department of Applied Chemistry, Waseda University, 3–4–1 Okubo, Shinjuku-ku, Tokyo 169–8555, Japan
Eiichi Kikuchi
Affiliation:
Department of Applied Chemistry, Waseda University, 3–4–1 Okubo, Shinjuku-ku, Tokyo 169–8555, Japan
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Abstract

A Pd/α-Al2O3 composite membrane was prepared on a porous α-Al2O3 disk via the thermal decomposition of bis(hexafluoroacetylacetonato)Pd(II), Pd(hfac)2. Pd(hfac)2 was dissolved in supercritical CO2 at 303 K, supplied to the substrate, and thermally decomposed at 403 and 443 K. The decomposition of Pd(hfac)2 at 443 K resulted in a sufficient pore filling of substrate with Pd as well as the formation of a thin Pd top layer. The hydrogen flux through this membrane was about 1.7 times than that of a electro-less plating Pd membrane with about 20 μm thick. Hydrogen permeation was governed by the solution-diffusion mechanism which gave a high separation selectivity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 752: Symposium AA – Membranes–Preparation, Properties and Applications , 2002 , AA12.1
Copyright
Copyright © Materials Research Society 2003

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References

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