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Stability of Ni/SiO2 catalysts

✍ Scribed by Prof. Peter Birke; Dr. Reinhard Geyer; Klaus Hoheisel; Michael Keck; Dr. Axel Pachulski; Dr. Rainer Schödel

Book ID
102086541
Publisher
John Wiley and Sons
Year
2011
Tongue
German
Weight
122 KB
Volume
84
Category
Article
ISSN
0009-286X

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✦ Synopsis

Abstract

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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✍ M. Montes; M. Genet; B. K. Hodnett; W. E. Stone; B. Delmon 📂 Article 📅 2010 🏛 Wiley (John Wiley & Sons) ⚖ 486 KB

Attempts were made t o regenerate two Ni/SiO c a t a l y s t s which were exposed t o s u l f u rcontaining compounds. Attempted regeneration wag by o x i d a t i o n followed by reduction. amount o f s u l f u r present a f t e r these treatments was followed by chemical a n a l y s i s and X-ray p