The effect of chlorine on nickel catalysts
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I would like to ask the experts on this forum: what are the effects of chlorine on nickel catalysts, and what consequences will arise? Please give me some advice. Thank you
It can poison the catalyst, especially nickel-based ones
Chloride ions have a significant impact on the catalyst. Typical catalytic devices have strict control over it.
Regarding hydrogenation, chloride ions: 1) cause permanent deactivation of nickel-based catalysts; therefore, the concentration of chloride ions must be strictly controlled. (In simple terms, chloride ions cause the active particles of the catalyst to grow larger, thereby reducing the catalyst’s activity.) 2) Another reason why chloride ions need to be strictly controlled is that they can cause corrosion in stainless steel equipment such as 304 and 321, creating safety hazards. 3)
The presence of chlorine in the feed oil or fresh hydrogen leads to two problems: first, it causes corrosion of the equipment, resulting in an increase in iron ions, which in turn raises the pressure drop across the catalyst bed; second, under high temperatures, chloride ions react with certain compounds present in the feed to form carbonaceous particles, which accumulate at the top of the catalyst bed.