| http://www.w3.org/ns/prov#value | - onding metals or alloys in the form of stabilized or unstabilized nanosize particles so as to give a coated catalyst. [0124] Gaseous reducing agents such as H2 or CO or ethylene can only be used when a shell structure has already been produced on impregnation with the metal salts. [0125] As regards the mechanism of shell formation in the production of noble metal coated catalysts on porous, shaped
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