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US 5,348,927 AGranted
Treatment for virgin phosphorous/vanadium oxidation catalysts
AssigneeScientific Design Company, Inc.
InventorArie Bortinger
Life of this patent
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Abstract
A method of removing chloride from phosphorus/vanadium/oxygen mixed oxide oxidation catalysts comprising treating a chloride containing catalyst comprising phosphorus, vanadium and oxygen with a stream of gas comprising oxygen, steam and an inert gas at flow rate and temperature and for a period of time to substantially reduce the amount of chloride in the catalyst.
Claims6
A method of removing chloride from phosphorus/vanadium/oxygen mixed oxide oxidation catalysts comprising treating a chloride containing virgin catalyst of the formula:
- VP.sub.a Zn.sub.b Mo.sub.c Li.sub.d O.sub.x
- wherein a is 0.90 to 1.3, b is 0.001 to 0.15, c is 0.005 to 0.10 and d is 0.001 to 0.15 and x is a determinate number wherein HCl is used as the reducing agent for the vanadium and said catalyst containing up to 1.0 wt % chloride with a stream of gas comprising oxygen, steam and nitrogen and having the composition in the area defined by A-B'-C of FIG. 1 at a temperature in the range of from 250.degree. to 420.degree. C. for 0.5 to 24 hours and to reduce the amount of chloride in the catalyst by at least 75%.
Dependencies are inferred from the claim text.