What is the principle behind hydrogen reduction in hydrogenation catalysts?
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During sulfidation, to prevent hydrogen reduction of the catalyst, the temperature at the highest point of the bed should be below 150°C when introducing hydrogen into the unit. Before H2S penetrates the catalyst bed, the temperature at the highest point of the bed should not exceed 230°C. Avoid the reduction of the catalyst’s metal components by high temperatures. May I ask experts what is the principle of hydrogen reduction in hydrogenation catalysts? Thank you!
1. After H2S penetrates the catalyst bed, the temperature exceeds 230 degrees; the oxygen in the oxidized catalyst reacts with hydrogen to form water. Nickel, tungsten, molybdenum... react with H2S to transform into sulfided forms, thereby achieving the purpose of presulfidization. 2. H2S did not penetrate the catalyst bed. At temperatures above 230 degrees, oxygen in the oxidized catalyst reacts with hydrogen to form water. There was no reaction of H2S with nickel, tungsten, and molybdenum; as more of these elements accumulated, they were reduced back to their metallic forms. This is the most serious accident that can occur during pre-sulfidization. I almost made this mistake when starting up my facility – although the temperature increased under abnormal conditions and H2S had penetrated the catalyst bed without causing any reduction, it still made me feel guilty for a long time. Haha........