Comprehensive characterization and permeation analysis of thin Pd/Al 2O3 composite membranes prepared by suction-assisted electroless deposition

Huey-Ing Chen, Chin Yi Chu, Ting Chia Huang

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In this work, suction-assisted electroless deposition technique is proposed to prepare high hydrogen permselective Pd/A1203 composite membranes. Effects of suction pressure and plating time on the surface morphology and denseness of the resulting composite membranes have been investigated. Scanning electron microscopy (SEM), electron probe microscope analysis (EPMA), x-ray diffractometry (XRD), and nitrogen permeability technique were used to characterize these membranes. Furthermore, the hydrogen permeability and selectivity of the composite membranes were also studied. The experimental result shows that the nitrogen permeability of the palladium (Pd) top layer is decreased with lowering the suction pressure. Under suction pressure of 3 kPa and plating time of 1 hr, a membrane with a perfectly dense 4.5 μm thick Pd layer can be obtained, whose H2/N2 selectivity is approaching infinite. As compared to the conventional electroless deposition, via suction assistance, the adhesion between the Pd top layer and Al 2O3 support of the resulting membranes can be remarkably improved, and the thickness attained for complete denseness can also be reduced effectively. Based on the hydrogen permeation results, it is found that the rate-limiting step for the hydrogen permeation through the Pd top layer is controlled by the surface reaction. Furthermore, the activation energy is estimated as 18 kJ/mol. This value is in a good agreement with those reported in literature for Pd layers thinner than 10 μm.

Original languageEnglish
Pages (from-to)1461-1483
Number of pages23
JournalSeparation Science and Technology
Volume39
Issue number7
DOIs
Publication statusPublished - 2004 Jun 15

Fingerprint

Composite membranes
Electroless plating
Palladium
Permeation
Hydrogen
Membranes
Plating
Nitrogen
Surface reactions
Surface morphology
Microscopes
Adhesion
Activation energy
X rays
Scanning electron microscopy
Electrons

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Process Chemistry and Technology
  • Chemical Engineering(all)
  • Filtration and Separation

Cite this

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abstract = "In this work, suction-assisted electroless deposition technique is proposed to prepare high hydrogen permselective Pd/A1203 composite membranes. Effects of suction pressure and plating time on the surface morphology and denseness of the resulting composite membranes have been investigated. Scanning electron microscopy (SEM), electron probe microscope analysis (EPMA), x-ray diffractometry (XRD), and nitrogen permeability technique were used to characterize these membranes. Furthermore, the hydrogen permeability and selectivity of the composite membranes were also studied. The experimental result shows that the nitrogen permeability of the palladium (Pd) top layer is decreased with lowering the suction pressure. Under suction pressure of 3 kPa and plating time of 1 hr, a membrane with a perfectly dense 4.5 μm thick Pd layer can be obtained, whose H2/N2 selectivity is approaching infinite. As compared to the conventional electroless deposition, via suction assistance, the adhesion between the Pd top layer and Al 2O3 support of the resulting membranes can be remarkably improved, and the thickness attained for complete denseness can also be reduced effectively. Based on the hydrogen permeation results, it is found that the rate-limiting step for the hydrogen permeation through the Pd top layer is controlled by the surface reaction. Furthermore, the activation energy is estimated as 18 kJ/mol. This value is in a good agreement with those reported in literature for Pd layers thinner than 10 μm.",
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Comprehensive characterization and permeation analysis of thin Pd/Al 2O3 composite membranes prepared by suction-assisted electroless deposition. / Chen, Huey-Ing; Chu, Chin Yi; Huang, Ting Chia.

In: Separation Science and Technology, Vol. 39, No. 7, 15.06.2004, p. 1461-1483.

Research output: Contribution to journalArticle

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