Mineral oils: processes and products – Chemical conversion of hydrocarbons – Cracking
Patent
1983-12-09
1985-03-12
Gantz, Delbert E.
Mineral oils: processes and products
Chemical conversion of hydrocarbons
Cracking
208 52CT, 502 50, 502521, C10G 1100, B01J 3718
Patent
active
045043817
ABSTRACT:
A method for passivating the adverse catalytic effects of metal contaminants, such as nickel, vanadium and iron, which become deposited on cracking catalyst is disclosed. A passivation promoter comprising elemental tin and/or a tin compound in combination with elemental cadmium and/or a cadmium compound is deposited on the catalyst and the catalyst is passed through a passivation zone having a reducing atmosphere maintained at an elevated temperature to decrease the adverse catalytic effects of the metal contaminants The present method is of particular utility where the residence time of the cracking catalyst in the passivation zone is relatively short.
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Chaudhuri O.
Exxon Research and Engineering Co.
Gantz Delbert E.
Mazer Edward H.
North Robert J.
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