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Mixed nickel‐aluminium oxides catalysts for the nitroxidation of toluene by no into benzonitrile
Author(s) -
Abouarnadasse S.,
Pajonk G. M.,
Teichner S. J.,
Germain J. E.
Publication year - 1984
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450620411
Subject(s) - benzonitrile , catalysis , toluene , nickel , nickel oxide , non blocking i/o , aerogel , oxide , inorganic chemistry , chemistry , redox , aluminium , materials science , chemical engineering , organic chemistry , nanotechnology , engineering
This paper describes the catalytic properties (activities, selectivities and stabilities with time on stream) of nickel oxide‐alumina aerogels and xerogels, towards the transformation of toluene by NO into benzonitrile at 440°C in a differential flow reactor. The stability of the catalysts depends upon the NiO content. When the ratio Ni/Al increases to unity, the catalysts (aerogel as well as xerogel) are very stable with time on stream and are active and selective like pure nickel oxide. The latter is indeed initially active and selective, but very unstable with time on stream. A redox model is proposed to explain the reaction mechanism.