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