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[wodus7715]

Hey guys,

I got a question about presulfiding catalyst with DMDS.

After we load catalyst in a reactor, we gotta reduce catalyst, which exists as metal oxide, with presulfiding agents such as DMDS.

I understood this concept that metal oxide needs to be reduced in order to become active. But I'm curious that sulfur is toxic against catalyst.

So my questions is why we reduce catalyst with sulfur which is poisoning catalyst??

Thank you!!

[P.K.Rao]

The catalyst is in the oxide form. It is reduced to metallic form with hydrogen. When it is reduced to metallic form, it becomes highly active. Coke formation would be very fast and rapid. In order to reduce the acivity to a workable activity , sulfide is dozed. One of the forms of the dozed sulfur is DMDS.

Edited by P.K.Rao, 06 June 2016 - 11:22 PM.