(19)
(11) EP 0 147 961 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.12.1986 Bulletin 1986/52

(43) Date of publication A2:
10.07.1985 Bulletin 1985/28

(21) Application number: 84308521

(22) Date of filing: 07.12.1984
(84) Designated Contracting States:
BE DE FR GB IT NL

(30) Priority: 09.12.1983 US 559891
09.12.1983 US 559918

(71) Applicant: EXXON RESEARCH AND ENGINEERING COMPANY
 ()

(72) Inventor:
  • Bertsch, Carl Franklin
     ()

   


(54) Passivation of cracking catalyst


(57) A process for passivating the adverse catalytic effects of metal contaminants, such as nickel, vanadium and iron, in a cracking system comprising a reaction zone (10), a regeneration zone (26) and a passivation zone (90), wherein a passivation promoter selected from the group consisting of cadmium-tin mixtures, cadmium, germanium, indium, tellurium and zinc and mixtures thereof is added to the cracking system. The passivation zone (90) is maintained at an elevated temperature and may also have a reducing atmosphere.






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