Thermische Stabilität von Ni/SiO<sub>2</sub>‐Katalysatoren

Schödel, R.; Geyer, Reinhard; Keck, Michael

doi:10.1002/cite.330640114

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2011

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“…To stabilize the catalyst, the catalyst bed is purged with nitrogen after reduction and then treated with an O 2 /N 2 mixture at temperatures from 50 to 80°C. Previous studies [35] showed that passivated nickel takes up oxygen during storage in air. Therefore, growing of the passivation layer takes place and the reactivation of the catalysts requires a higher temperature.…”

Section: Problemmentioning

confidence: 97%

Stability of Ni/SiO₂ catalysts

Birke¹,

Geyer²,

Hoheisel³

et al. 2011

Chemie Ingenieur Technik

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It was shown that catalysts used in the slurry phase hydrogenation of nitroaromatic compounds are post-passivated during exhibition in air for a longer period of time. This post passivation hampers a reactivation of the catalyst and is decelerated with increasing catalyst particle size. Furthermore a fast mixing during feeding in the nitroaromatic compound into the reactor and sufficient hydrogen supply to the catalyst surface have to be ensured to avoid an oxidic attack of the nitroaromatic compound towards the nickel catalyst and to obtain a slow deactivation of the this catalyst.

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Section: Problemmentioning

confidence: 97%