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US 8,940,652 B2Granted
Phosphorus modified cracking catalysts with enhanced activity and hydrothermal stability
AssigneeBASF SE
InventorsQi Fu, Chandrashekhar Pandurang Kelkar, Gary Smith, Bilge Yilmaz
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Abstract
A phosphorus modification of an FCC catalyst is provided by reducing the sodium content of the as formed catalyst, a first treatment with a phosphate solution, a second ammonium exchange to further reduce the sodium content of the phosphorus solution treated catalyst and a second treatment with a phosphate solution.
Claims19
A process for modifying an FCC zeolite catalyst with phosphorous comprising:
- exchanging an as-crystalized catalyst with an ammonium salt, so as to provide the catalyst with a sodium content of less than about 2% by weight Na2O, treating the ammonium-exchanged catalyst with a first phosphate solution, sufficient to add 0.5 to 2% by weight P2O5 on the catalyst, ammonium ion exchanging the phosphorous treated catalyst to yield a low sodium catalyst having a sodium content as Na2O to less than about 0.5 wt. %, and treating the low sodium catalyst with a second phosphate solution, sufficient to provide the catalyst with 2-4 wt. % P2O5 on the catalyst.
Dependencies are inferred from the claim text.