The pressurized hydrogen gas is allowed to flow through the filter to a constant lower pressure. The flow rates are then determined. The results are compared with the flow rate of a typical Pd-Ag membrane in Figure 1. At the low pressure, samples tested have about same permeability constant as the Pd-Ag membrane. The ceramic membrane filter can be produced by a sol-gel process.
Tests show promising results.
Improvement on a defect free, large filter is in progress.