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