Regeneration of supported noble metal catalysts
Conference
·
OSTI ID:141297
- Exxon Research and Engineering Company, Annandale, NJ (United States)
The loss in catalyst performance due to coking in hydrocarbon processes is generally compensated by a periodic increase in the process temperature. However, when the maximum process temperature is reached, the catalyst has to be generated by a coke burn step in order to recapture fresh catalyst activity. The regeneration of bifunctional reforming catalysts requires high temperature coke burn to facilitate coke removal form the support surfaces, i.e., from the acid sites. Agglomeration of the supported metal particles often occurs due to oxidizing atmosphere and high local temperature. Redispersion of the sintered catalyst to a highly dispersed state can be accomplished by an in situ treatment with a chlorine containing gas. Well established regeneration and redispersion procedures are available with Pt/Al{sub 2}O{sub 3} catalysts. However, the direct application of the Pt/Al{sub 2}O{sub 3} regeneration and redispersion procedures to Pt-Ir/Al{sub 2}O{sub 3} catalysts has revealed the difficulties in the regeneration and redispersion of iridium containing catalysts and has provided an effective method to redisperse agglomerated iridium.
- OSTI ID:
- 141297
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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