Temperature-programmed reduction of metal-contaminated fluid catalytic cracking (FCC) catalysts


Bayraktar O. , KUGLER E. L.

APPLIED CATALYSIS A-GENERAL, cilt.260, ss.125-132, 2004 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 260 Konu: 1
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1016/j.apcata.2003.10.013
  • Dergi Adı: APPLIED CATALYSIS A-GENERAL
  • Sayfa Sayıları: ss.125-132

Özet

A temperature-programmed reduction study of equilibrium fluid catalytic cracking (FCC) catalysts has shown three hydrogen-consumption peaks associated with contaminanted metals. A low-temperature peak, located near 510degreesC, is produced by the reduction of several components in the catalyst. Highly-dispersed vanadium contributes to this peak. A high-temperature peak, located near 800degreesC, is produced by reduction of nickel aluminate or nickel silicate compounds. A linear relationship exists between the area of the high-temperature peak and nickel concentration on equilibrium catalysts. An intermediate-temperature peak, located near 690degreesC, appears to be related to some form of vanadium compound. The intermediate-temperature peak does not occur on low-vanadium-concentration equilibrium catalysts, but is observed at higher vanadium-contamination levels.