Various hydrogen production and hydrogen sulfide decomposition processes are disclosed that utilize composite metal membranes that contain an intermetallic diffusion barrier separating a hydrogen-permeable base metal and a hydrogen-permeable coating metal. The barrier is a thermally stable inorganic...http://www.google.co.uk/patents/US5217506?utm_source=gb-gplus-sharePatent US5217506 - Hydrogen-permeable composite metal membrane and uses thereof
