This invention discloses an optimum set of adsorbents for use in H.sub.2-PSA processes. Each adsorbent bed is divided into four regions; Region 1 contains adsorbent for removing water; Region 2 contains a mixture of strong and weak adsorbents to remove bulk impurities like CO.sub.2; Region 3 contains a high bulk density (>38 lb.sub.m/ft.sup.3) adsorbent to remove remaining CO.sub.2; and most of CH.sub.4 and CO present in H.sub.2 containing feed mixtures; and Region 4 contains adsorbent having high Henry's law constants for the final cleanup of N.sub.2 and residual impurities to produce hydrogen at the desired high purity.

 
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