(under subclass 300) Composition prepared by removing a metal from an alloy, leaving the remaining metal behind as the catalyst.
(1) Note. The remaining catalytic metal is generally in a highly active porous or finely divided state.
(2) Note. The metal may be removed by any method, e.g., dissolving out by chemical means or by volatilization, etc.
(3) Note. If a metal catalyst is named a "Raney" catalyst, it will be presumed to be proper for this subclass unless it is positively disclosed to be made by a method not within the scope of the definition of this subclass.
