About catalysts
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Can cobalt-nickel catalysts from different applications be used as catalysts for desulfurization? The goal is to convert gaseous sulfur compounds such as COS into inorganic sulfur forms like H2S, but there is concern regarding the occurrence of a CO—CO2 reaction. I would appreciate some guidance from those with expertise. :)
This catalyst can be used in the hydrogenation conversion of gases such as water gas, coke oven gas, and syngas, and it exhibits a high capacity for hydrogenating organic sulfides, olefins, and oxygen present in these gases. This catalyst is also suitable for petroleum fractions. The hydrogenation conversion process of feed gases such as natural gas and field gas. The main reactions in the hydrogenation conversion process are as follows: COS + H2 → CO + H2S; RSH + H2 → RH + H2S; R1SR2 + 2H2 → R1H + R2H + H2S; R1SSR2 + 3H2 → R1H + R2H + 2H2S; C4H4S + 4H2 → C4H10 + H2S; O2 + 2H2 → 2H2O; CnH2n + H2 → CnH2n+2. This post was last edited by kaisl1314 on 2008-1-17 at 16:40
I’ve changed positions, but I’m worried about the conversion reaction of CO to CO2; I really don’t understand it. Moreover, the current conversion catalysts are of the Co-Mo type, while for the hydrogenation of coke oven gas, there are Fe-Mo and Ni-Mo types – Co-Ni types are rarely seen. Is it a mistake or do I really not understand? Both Co-Mo series transformation catalysts and Fe-Mo and Ni-Mo series hydrogenation catalysts are effective in the hydrogenation of organic sulfur to convert it into hydrogen sulfide. There is no doubt about this.
Before the 1960s, Fe-Gr catalysts were commonly used for shift conversion, with an operating temperature range of 350–550°C. After the 1960s, cobalt-molybdenum hydrogenation shift catalysts were developed; the operating temperature for these catalysts is 200–280°C. To distinguish between these two shift processes with different operating temperatures, the former is conventionally referred to as \"medium-temperature shift,\" while the latter is called \"low-temperature shift.\" Depending on the method used for recovering heat, the shift reaction can be divided into the quenching process and the waste heat boiler process. In the quenching process, the crude feed gas after quenching is already saturated with water vapor, and the shift reaction takes place directly without cooling or desulfurization. Therefore, different catalysts are used in these two processes depending on the process conditions: a Co-Mo sulfur-resistant shift catalyst is used in the quenching process, while an Fe-Cr shift catalyst is used in the waste heat boiler process. In medium-temperature catalysts, potassium is an effective promoter, and catalysts with different potassium contents exhibit significant differences in activity. The addition of a small amount of potassium salts is beneficial for the catalyst’s activity, heat resistance, and strength. Catalysts generally contain 0.2~0.4% K2O.