Issues with diesel hydrogenation plant shutdowns
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Why is the carbon monoxide content in the cyclic hydrogen analyzed when diesel hydration is shut down?
At 205°C, it forms nickel carbide with the catalyst
Carried in the new hydrogen produced from carbon monoxide hydrogenation,
Consider the methanation reaction, the nickel hydroxide reaction.
The level of carbon monoxide affects the methanation reaction with hydrogen; this is an exothermic reaction, and it helps to prevent overheating. On the other hand, as mentioned earlier, nickel carbonyl is formed. When we stop operations, we analyze the composition as well as the level of hydrogen sulfide, in order to prevent the catalyst from being reduced!
During the shutdown process, if the CO level is too high, it will react with the catalyst at 220°C to form the highly toxic substance nickel carbonyl
Excess CO can lead to methanation reactions; in severe cases, this can cause overheating or even a loss of control over temperature.