Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1974-09-23
1976-09-21
Douglas, Winston A.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
208140, B01J 2396, C10G 3508
Patent
active
039818233
ABSTRACT:
The instant invention relates to a process for activating iridium-containing catalysts, said catalysts being inactive because of the presence of the iridium as large crystallites of low activity, and which comprises the step of contacting said catalyst with a halogen-containing gas in the presence of from 0.01 to 10% by volume oxygen, at a temperature of at least 300.degree.C. for a time sufficient to redisperse said large crystallites to crystallites having a substantially smaller particle size. Preferably, the catalyst is a reforming catalyst comprising iridium supported on alumina. In the most preferred embodiment of the instant invention an iridium: platinum on alumina catalyst, which has become deactivated by use in a reforming process wherein carbonaceous materials have deposited on the surface of the catalyst, is regenerated by (1) burning off said carbonaceous deposits by contacting said catalyst with oxygen at a temperature of at least 300.degree.C. for a time sufficient to substantially remove said carbonaceous materials, (2) contacting said catalyst with hydrogen at a temperature and time sufficient to reduce said iridium and platinum substantially to metallic form, and (3) redispersing said metals by contacting said reduced catalyst with oxygen and a halogen-containing gas, e.g., chlorine, the oxygen being present in an amount of less than 10% oxygen by volume, at a temperature of at least 300.degree.C.
REFERENCES:
patent: 2848377 (1958-08-01), Webb
patent: 3117076 (1964-01-01), Brennan
patent: 3850747 (1974-11-01), Sinfelt et al.
Douglas Winston A.
Exxon Research and Engineering Company
Konopka P. E.
Simon Jay
LandOfFree
Regeneration of iridium-containing catalysts does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Regeneration of iridium-containing catalysts, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Regeneration of iridium-containing catalysts will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1412568