Issues regarding oxygen in precise desulfurization
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What impact does high oxygen content in the advanced desulfurization process have on iron-molybdenum catalysts? And what is the impact on the entire desulfurization process? Those who know about this, please give me some advice!
According to the mechanism of dry desulfurization, H2S is first adsorbed onto the surface of the desulfurizer, after which it reacts with O2 to form elemental sulfur that deposits within the micropores of the desulfurizer, thereby achieving the removal of H2S； The presence of O2 is crucial for dry desulfurization systems; if the O2 content in the gas is not sufficient to oxidize H2S to elemental sulfur, the desulfurizing agent will quickly reach saturation when absorbing hydrogen sulfide, thereby losing its desulfurization capacity ； Therefore, a slightly higher level of O2 in the gas has little impact on dry desulfurization systems; however, the O2 content is generally controlled at 1.5 times the theoretical amount, as it is unnecessary to have a higher level ； If the desulfurizer is ZnO, high O2 levels will lead to a decrease in sulfur capacity; no adverse effects have been reported for other types of desulfurizers.
We use wet flue gas desulfurization; I don’t think a high oxygen content has much of an impact. If anyone knows anything about this, please let me know – I’d like to find out as well
When the O2 level is too high, the active component MoS2 in the catalyst turns into sulfate and becomes permanently inactive, and it cannot be re-sulfurized.
It should be applicable to activated carbon desulfurization!
Iron-molybdenum catalysts are used to promote the conversion of organic sulfur; too high an oxygen content can cause the active components of the catalyst to oxidize, resulting in the formation of sulfates, which in turn weakens the catalyst’s ability to convert organic sulfur.