Ag-Cu-Pd (Silver - Copper - Palladium)

,

doi:10.1007/10916070_14

Landolt-Börnstein - Group IV Physical Chemistry

DOI: 10.1007/10916070_14

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Ag-Cu-Pd (Silver - Copper - Palladium)

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Structural and Permeation Kinetic Correlations in PdCuAg Membranes

Zhao

Goldbach

Bao

et al. 2014

ACS Appl. Mater. Interfaces

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Addition of Ag is a promising way to enhance the H2 permeability of sulfur-tolerant PdCu membranes for cleanup of coal-derived hydrogen. We investigated a series of PdCuAg membranes with at least 70 atom % Pd to elucidate the interdependence between alloy structure and H2 permeability. Membranes were prepared via sequential electroless plating of Pd, Ag, and Cu onto ceramic microfiltration membranes and subsequent alloying at elevated temperatures. Alloy formation was complicated by a wide miscibility gap in the PdCuAg phase diagram at the practically feasible operation temperatures. X-ray diffraction showed that the lattice constants of the fully alloyed ternary alloys obey Vegard's law closely. In general, H2 permeation rates increased with increasing Ag and decreasing Cu content of the membranes in the investigated temperature range. Detailed examination of the permeation kinetics revealed compensation between activation energy and pre-exponential factor of the corresponding H2 permeation laws. The origin of this effect is discussed. Further analysis showed that the activation energy for H2 permeation decreases overall with increasing lattice constant of the ternary alloy. The combination of these correlations results in a structure-function relationship that will facilitate rational design of PdCuAg membranes.

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Structural and Permeation Kinetic Correlations in PdCuAg Membranes

Zhao

Goldbach

Bao

et al. 2014

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

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Ag-Cu-Pd (Silver - Copper - Palladium)

Cited by 1 publication

References 10 publications

Structural and Permeation Kinetic Correlations in PdCuAg Membranes

Structural and Permeation Kinetic Correlations in PdCuAg Membranes

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