Ultra-thin palladium technologies enable future commercial deployment of PEM fuel cell systems

A Comparison of the Inhibiting Effect of CO and CO2 to Hydrogen Permeation and n-Value in Pd and Pd/Ag Membranes Prepared on Alumina Support

“…This indicates that alloying with silver has enhanced hydrogen permeation and also achieved a Sievert driving force at (n = 1) which means surface processes i.e. hydrogen dissociative adsorption on the high pressure feed side and/or the atomic hydrogen recombination and desorption at the low pressure permeate side control hydrogen permeation [16], After these tests, both Pd and Pd/Ag membranes were annealed in hydrogen at high temperature to investigate the effect of annealing on both the hydrogen flux and CO inhibition to hydrogen permeation through the membrane. The presence of CO in the permeate stream led to the poisoning of the membrane surface and blocking hydrogen permeation sites through competitive adsorption thus causing deviation from Sievert's law.…”

Microreactors and membrane microreactors: fabrication and applications

“…The permeation property of the MMs depends strongly on the geometry, morphology, preparation methods of the support and uniformity of fi lm deposition. Chen and Gobina ( 2010 ) reported that a support with high hydrogen affi nity is much more effi cient, due to the resistance to hydrogen-induced failures or cracks. Generally, thin membranes exhibit higher hydrogen fl ux (2-10 mol/ m 2 s) but a selectivity decline.…”

Electroless Plating of Palladium Membranes on Porous Substrates for Hydrogen Separation and the Effects of Process Factors on Plating Rate and Efficiency: A Review

“…Ultra pure hydrogen is in demand and widely used in petroleum and petrochemical industries such as in petroleum refining, production of ammonia and methanol [6] [7]. However, more recently, advances in polymer electrolyte membrane fuel cell (PEMFC) for both stationary and vehicular applications has led to a surge in demand for ultra pure hydrogen [8]. Palladium membranes are the membranes of choice for hydrogen because they permeate only hydrogen when dense [5].…”

“…In the conventional electroless plating process, the major problem is how to achieve uniform densification of the palladium layer and also prevent mass transfer from the film into the solution. However, optimisation of these process factors is one critical way of ameliorating the mass transfer problem in the conventional electroless plating [8] [9]. This overview critically discuss the effects of the process factors on plating rate and efficiency of the electroless plating of Palladium-based membranes on porous support and the areas requiring further investigation.…”