{HEAD ~ A preferred intermetallic diffusion barrier} for {TAIL ~ use} in the inventive method is noble metal eggshell catalyst comprising zirconia stabilized with yttria, in particular zirconia stabilized with 6 to 8 wt % yttria 
{ HEAD ~ A preferred intermetallic diffusion barrier } for { TAIL ~ use } in the inventive method is noble metal eggshell catalyst comprising zirconia stabilized with yttria , in particular zirconia stabilized with 6 to 8 wt % yttria
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