Purpose of presulfurization of continuous reforming pre-hydrogenation catalysts
Thread Content
Some people say that the presulfurization of catalysts used in reformation pre-hydrogenation is done to suppress activity, but isn’t presulfurization of hydrogenation catalysts intended to restore activity? What is the purpose of presulfurization?
During the production, transportation, and storage of catalysts, in order to control their activity, their active metal components exist in an oxidized state； After sulfidation, the hydrogenation activity and thermal stability of the catalyst are both **improved; therefore, the catalyst must be pre-sulfidized before being used with oil, so that its activity and stability meet the requirements for production.
Change from oxidized state to sulfided state to restore its activity
Pre-hydrogenated catalysts in the sulfided state exhibit better activity, while reforming catalysts are sulfided
It is to suppress activity and prevent carbon formation
To restore activity, the sulfide state is more active than the oxide state. Has the original poster confused terms like reformation sulfur injection and semi-regeneration?
That one is a semi-regenerated platinum-rhodium catalyst. Currently, sulfur injection in continuous reforming is used to protect the reactors and pipelines from coking on the metal walls
Pre-sulfurization of reforming pre-hydrogenation catalysts is intended to enhance their activity, while reforming catalysts are subjected to such treatment to suppress their activity; in both cases, the goal is to extend their service life
Preventing the formation of coke doesn’t it protect the reactor, the central cylinder, and the sectoral cylinders as well? Whether it is semi-regenerative or continuous reforming, the principles are the same
Semi-regeneration mainly aims to reduce catalyst activity and extend its service life, while in continuous reforming it is used to deactivate the reactor walls.