A new technique to prepare a palladium membrane for high-temperature hydrogen permeation was developed: Pd(C3H3)(C5H5) an organometallic precursor reacted with hydrogen at room temperature to decompose into Pd crystallites. This reaction together with sintering treatment under hydrogen and nitrogen in sequence resulted in the formation of dense films of pure palladium on the surface of the mesoporous stainless steel (SUS) support. Under H-2 atmosphere the palladium membrane could be sintered at 823 K to form a skin layer inside the support pores. The hydrogen permeance was 5.16x10(-2) cm(3) cm(-2) cm Hg-1 s(-1) at 723 K. H-2/N-2 selectivity was 1600 at 723 K.