Hydrogenation catalyst sulfidation problem
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Experts, generally, catalyst sulfidation in high-pressure hydrogenation units is carried out under conditions close to the system pressure. Recently, I saw a case of catalyst pre-sulfidation by Shell, where the sulfidation was performed at around 6 megapascals; I’m not sure why. What is the difference between vulcanization under high pressure and vulcanization under low pressure?
Based on personal experience, high-pressure and low-pressure presulfurization has no effect on the catalyst’s activity, as the pressure used for presulfurization during experiments can sometimes reach 2 MPa.
I encountered dry sulfiding once before, with the control system pressure set at 60 kilograms; it seems that high and low pressures have little impact on catalyst sulfiding.
Then why does some require 6 MPa while others need 14 MPa? The difference is quite large, isn’t it?
There must be an impact, right? After all, it is the highest temperature and pressure that affect the vulcanization process.