As for the noble metal eggshell catalyst that may suitably be used as a layer of intermetallic diffusion barrier particles that is applied to the surface of the porous substrate, {HEAD ~ the noble metal eggshell catalyst} is defined and described in {TAIL ~ great detail} in U.S. Pat 
described in
As for the noble metal eggshell catalyst that may suitably be used as a layer of intermetallic diffusion barrier particles that is applied to the surface of the porous substrate , { HEAD ~ the noble metal eggshell catalyst } is defined and described in { TAIL ~ great detail } in U.S. Pat
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