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Poster RSE 15005127

High Temperature Performance of a Palladium Membrane Supported on a porous stainless steel support modified with an alumina barrier layer

Poster

ICCMR12 - 12° International Conference on Catalysis in Membrane Reactors 22-25 , Giugno-2015.

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F. Azzurri (Università degli Studi di Genova), A. Bottino (Università degli Studi di Genova), R. Caprifoglio (Università degli Studi di Genova), A. Comite (Università degli Studi di Genova), M. Broglia (RSE SpA), P. Pinacci (RSE SpA)

INDUSTRIA 2015 - Energy efficiency in industrial sector

A stainless steel supported Palladium membrane, with an alumina interlayer barrier, for the hydrogen production, has been tested until 500°C for about 1000 h. the membrane has showed a very good stability in hydrogen flux and a good selectivity.

High temperature inorganic membranes can play a key role in the development of very efficient membrane reactors for hydrogen production. Palladium based membranes are considered promising candidates especially for applications in small scale hydrogen generation systems. The Pd membranes are supported on a porous metallic substrate in order to obtain thin and mechanically stable Pd layer. However the irreversible poisoning of the palladium layer, due to the intermetallic diffusion phenomena of the alloy elements, forces the interposition of a ceramic barrier layer between the dense palladium layer and the porous metal support. An alumina barrier layer has been deposited by the dip-coating technique of sol-gel, on a thermally treated support tube.

The deposition of the Pd layer has been carried out using the electroless deposition technique. The final thickness of the palladium layer has been estimated to be about 30µm and the He permeance has been decreased to about 10-9 mol s-1 m-2 Pa-1. The membrane has been characterised in terms of gas permeation both at room temperature (He, N2) and in the range from 380°C to 500°C (H2, He, N2) and in an inlet pressure range from 100 mbar to 4 bar.

The behaviour in presence of hydrogen of the palladium membrane has been tested at various temperatures and pressures. The membrane has shown a very good stability in hydrogen even at 500°C for a total testing period of about 1000 h.

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