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