The reaction of carbon monoxide in hydrogenation reactors
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The reactions of carbon monoxide in the hydrogenation reactor are methanation and the formation of nickel carbonyl, but these two reactions do not occur simultaneously, right? Does anyone who is an expert know what the degrees are for each one?
1. Under the action of nickel- or cobalt-containing catalysts, carbon monoxide and carbon dioxide react with hydrogen at temperatures between 200°C and 350°C to produce methane, while releasing a large amount of heat. The heat generated by the methanation reaction causes the catalyst bed in the reactor to heat up excessively, resulting in an uneven temperature distribution and unstable operation of the plant. 2. Carbon monoxide, carbon dioxide, and hydrogen compete for adsorption at the active sites of the catalyst, affecting the utilization of the hydrogenation active sites. Carbon monoxide may form toxic, volatile carbonyl compounds with the metal components on the catalyst, thereby causing corrosion of the catalyst and reducing its activity. 50℃ 230℃ 4CO+Ni --------- Ni(CO)4--------------Ni+4CO Since the above reaction occurs more easily at low temperatures, the catalyst’s activity is reduced each time it is put into use when carbon monoxide is present in the recycled hydrogen. At low temperatures, carbon monoxide reacts with the nickel component on the catalyst to form nickel carbonyl; when the temperature rises, nickel carbonyl volatilizes and sublimates, exposing metallic nickel on the surface of the catalyst. Metallic nickel has a very high hydrogenolysis activity, which can easily lead to coking and deactivation.
1. Under the action of nickel- or cobalt-containing catalysts, carbon monoxide and carbon dioxide react with hydrogen at temperatures between 200°C and 350°C to produce methane, while releasing a large amount of heat. The heat generated by the methanation reaction causes the catalyst bed in the reactor to heat up excessively, resulting in an uneven temperature distribution and unstable operation of the plant. 2. Carbon monoxide, carbon dioxide, and hydrogen compete for adsorption at the active sites of the catalyst, affecting the utilization of the hydrogenation active sites. Carbon monoxide may form toxic, volatile carbonyl compounds with the metal components on the catalyst, thereby causing corrosion of the catalyst and reducing its activity. 50℃ 230℃ 4CO+Ni --------- Ni(CO)4--------------Ni+4CO Since the above reaction occurs more easily at low temperatures, the catalyst’s activity is reduced each time it is put into use when carbon monoxide is present in the recycled hydrogen. At low temperatures, carbon monoxide reacts with the nickel component on the catalyst to form nickel carbonyl; when the temperature rises, nickel carbonyl volatilizes and sublimates, exposing metallic nickel on the surface of the catalyst. Metallic nickel has a very high hydrogenolysis activity, which can easily lead to coking and deactivation.
Ooooh, I see, thanks
What should be done once such a problem occurs?