C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 11/00 (2006.01) B01J 20/06 (2006.01) C22B 11/02 (2006.01)
Patent
CA 2111198
2111198 9222674 PCTABS00018 A method for the recovery of platinum and rhodium lost from a platinum-containing catalyst during ammonia oxidation processes at a temperature above 850 ·C. Lost precious metal is brought into contact with a foraminate element fabricated from a material consisting essentially of palladium, characterized by (a) novel configuration whereby the initial product of the formula: curve to flat ratio (C/F) multiplied by mesh size (N) and wire diameter (dw), for the element is greater than at least about 0.9 and (b) where, for a given nitrogen throughput, the weight recovery efficiency is a function of the curve to flat ratio (C/F), wire diameter (dw) and mesh size (N) combination and weight recovery efficiency is improved by increasing the mesh size (N) for a given wire diameter, increasing the diameter (dw) for a given mesh size, and increasing the curve to flat ratio (C/F) to ratio of above about .pi./2. Preferably, the initial product of the formula is in the range of from about 0.9 to about 10.
Heffernen Steven A.
Hochella William A.
Gowling Lafleur Henderson Llp
Johnson Matthey Inc.
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