Abstract
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.
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