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Stability of Ni/SiO 2 catalysts
Author(s) -
Birke Peter,
Geyer Reinhard,
Hoheisel Klaus,
Keck Michael,
Pachulski Axel,
Schödel Rainer
Publication year - 2012
Publication title -
chemie ingenieur technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.365
H-Index - 36
eISSN - 1522-2640
pISSN - 0009-286X
DOI - 10.1002/cite.201100105
Subject(s) - catalysis , slurry , passivation , chemical engineering , materials science , nickel , mixing (physics) , hydrogen , particle (ecology) , phase (matter) , catalyst support , particle size , chemistry , metallurgy , organic chemistry , nanotechnology , composite material , physics , oceanography , geology , engineering , layer (electronics) , quantum mechanics
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.