How is presulfurization done?
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How to presulfurize sulfur-resistant shift catalysts?
The catalyst manufacturer should provide operating procedures, and these procedures must be followed step by step; in addition, the operating conditions of the equipment need to be confirmed prior to pre-sulfurization. Pay attention to the displacement, the rate of temperature increase and the addition of vulcanizing agents, as well as the changes in the hydrogen sulfide concentration in the circulating gas. Also keep an eye on changes in water content; drainage at low levels needs to be measured in order to determine the degree and progress of vulcanization. After the sulfidation meets the requirements, displacement is carried out.
The poster's question is how catalysts are sulfided? Is it still the current method for preparing pre-sulfided catalysts? Sulfur-resistant shift catalysts already come in pre-sulfided versions, eliminating the need for on-site sulfidation.
Pre-sulfidation method for preparing catalysts
There is a chemical reaction mechanism: the catalyst turns into a sulfide state； There is a physical method: immersing sulfur on the catalyst through dipping.