Sulfur Recovery Daily Question 2018.12.13
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Why is pre-sulfurization of cobalt/molybdenum catalysts necessary? Answer: The exhaust gas purification reactor of this unit is equipped with a cobalt/molybdenum catalyst, which facilitates the reaction of S and SO2 with H2. The active centers of this catalyst are cobalt sulfide and molybdenum sulfide; however, the catalyst provided by the manufacturer consists of cobalt oxide and molybdenum oxide. Therefore, pre-sulfidization of this catalyst is necessary at the time of the unit’s first operation. If the catalyst is regenerated when the unit is shut down, pre-sulfidization must still be carried out before it is used again in operation.
It is cobalt sulfide and molybdenum sulfide that play a reactive role, whereas the components of the catalyst provided by manufacturers are cobalt oxide and molybdenum oxide; therefore, pre-sulfidization of this catalyst must be carried out when the plant is started up for the first time. If the catalyst is regenerated when the plant is shut down, pre-sulfidization must also be performed before it is used again in the next startup.
The exhaust gas purification reactor of this device is filled with a cobalt/molybdenum catalyst, which facilitates the reaction of S and SO2 with H2; the active sites of this catalyst are cobalt sulfide and molybdenum sulfide； The components of the catalyst provided by the manufacturer are cobalt oxide and molybdenum oxide; therefore, pre-sulfidization of this catalyst is necessary when the plant is started up for the first time. If the catalyst is regenerated when the plant is shut down, pre-sulfidization is also required before it is used again during the next startup.
The exhaust gas purification reactor of this device is filled with a cobalt/molybdenum catalyst, which facilitates the reaction of S and SO2 with H2; the active sites of this catalyst are cobalt sulfide and molybdenum sulfide； The components of the catalyst provided by the manufacturer are cobalt oxide and molybdenum oxide; therefore, pre-sulfidization of this catalyst is necessary when the plant is started up for the first time. If the catalyst is regenerated when the plant is shut down, pre-sulfidization is also required before it is used again during the next startup.
Catalyst sulfidation refers to the process in which, during production, transportation, and storage, in order to control the catalyst’s activity, its active metal components exist in an oxidized state； After sulfidation, the hydrogenation activity and thermal stability of the catalyst are **improved; therefore, the catalyst must be pre-sulfidized before being used with oil, so that its activity and stability meet the requirements for production.
The exhaust gas purification reactor of this device is filled with a cobalt/molybdenum catalyst, which facilitates the reaction of S and SO2 with H2; the active sites of this catalyst are cobalt sulfide and molybdenum sulfide； The components of the catalyst provided by the manufacturer are cobalt oxide and molybdenum oxide; therefore, pre-sulfidization of this catalyst is necessary when the plant is started up for the first time. If the catalyst is regenerated when the plant is shut down, pre-sulfidization is also required before it is used again during the next startup.
Catalyst sulfidation refers to the process in which, during production, transportation, and storage, in order to control the catalyst’s activity, its active metal components exist in an oxidized state； After sulfidation, the hydrogenation activity and thermal stability of the catalyst are **improved; therefore, the catalyst must be pre-sulfidized before being used with oil, so that its activity and stability meet the requirements for production.
It is cobalt sulfide and molybdenum sulfide that play a reactive role, whereas the components of the catalyst provided by manufacturers are cobalt oxide and molybdenum oxide; therefore, pre-sulfidization of this catalyst must be carried out when the plant is started up for the first time. If the catalyst is regenerated when the plant is shut down, pre-sulfidization must still be performed before it is used again in the next startup
The catalyst can exhibit its corresponding catalytic capacity only in a sulfided state.
The purpose of presulfurization is to enhance the activity of cobalt-molybdenum catalysts; it involves selectively deactivating the catalyst in order to prevent its activity from rising too high and thus protect the catalyst.
It is cobalt sulfide and molybdenum sulfide that play a reactive role, whereas the components of the catalyst provided by manufacturers are cobalt oxide and molybdenum oxide; therefore, pre-sulfidization of this catalyst must be carried out when the plant is started up for the first time. If the catalyst is regenerated when the plant is shut down, pre-sulfidization must still be performed before it is used again in the next startup