Simulation of supported iridium catalyst sintering and redispersion

Journal Article · Thu Jan 01 04:00:00 EST 1987 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(87)90100-X· OSTI ID:5590042

Rice, R W; Chien, C C

During periodic coke-burnoff as well as during normal use, naphtha reforming catalysts may lose activity due to metal sintering. Such deactivation can be offset by in situ redispersion treatments. This paper describes a Monte Carlo method-based computer simulation of both phenomena for iridium (or Pt/Ir) supported on chlorinated alumina. The model incorporates both molecular and crystallite migration mechanisms, plus possible vapor phase transport and the concept of chemical trap sites. Both sintering and redispersion have been simulated in numerous runs aimed at determining the effect of atmosphere, metal loading, temperature, time, etc., on dispersion. The predictions of the model qualitatively describe experimentally observed behavior.

• Research Organization: Clemson Univ., SC
• OSTI ID: 5590042
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 103:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL REACTIONS
COAL TAR OILS
COMPUTERIZED SIMULATION
DEACTIVATION
DISPERSIONS
DISTILLATES
DISTRIBUTION
ELEMENTS
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FUELS
IRIDIUM
METALS
MONTE CARLO METHOD
NAPHTHA
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM DISTILLATES
PETROLEUM FRACTIONS
PLATINUM METALS
QUANTITY RATIO
REFORMER PROCESSES
SIMULATION
SINTERING
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENTS