Compositions – Gaseous compositions – Carbon-oxide and hydrogen containing
Reexamination Certificate
2005-08-02
2005-08-02
Langel, Wayne A. (Department: 1754)
Compositions
Gaseous compositions
Carbon-oxide and hydrogen containing
Reexamination Certificate
active
06923922
ABSTRACT:
A method for the recovery of rhodium from spent supported catalysts. In one embodiment, a method for recovering rhodium from a host material includes roasting the host material in air at a temperature sufficient to convert at least a portion of rhodium to Rh2O3, leaching the host material in a solution with a leaching constituent which is reactive with Rh2O3to form a first intermediate species, reacting the first intermediate species in a solution with an acidifying constituent or complexing agent to form a second intermediate species, and purifying the second intermediate species. Preferably, the roasting temperature is approximately from 600° C. to 800° C. for 0.5 to 10 hours. In some embodiments, the host material is ground to particles in the range of 0.1 to 10 mm.
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Allison Joe D.
Chen Zhen
Hu Baili
Ricketson Kevin L.
Wright Harold A.
Conley & Rose, P.C.
ConocoPhillips Company
Langel Wayne A.
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