Article,
Characterizations of nanostructured nickel aluminates as catalysts for conversion of glycerol: Influence of the preparation methods
ADVANCED POWDER TECHNOLOGY, 28 (1, SI): 131-138 (2017)
DOI: 10.1016/j.apt.2016.09.013
Abstract
Three different preparation methods were applied to prepare nickel
aluminates (i.e. nanocasting (NiAIN), coprecipitation (NiAIC) and wet
impregnation (NiAIW) methods). All catalysts exhibited the
NiAl(2)O(4)phase besides that of NiO and gamma-Al2O3. The NiAIN catalyst
showed nanoparticles of the aforesaid oxides whereas NiAlxOy was the
predominant phase found over NiAlW catalyst. The performances of the
nickel aluminate-based catalysts were evaluated in glycerol dehydration
to produce valuable chemical compounds through the dehydration of
glycerol. The sintering effects were responsible for the decreased
performance of NiAlC in glycerol dehydration. On the contrary, NiAlN is
found to be deactivated due to the lesser stability of its supported
nanoparticles, being the glycerol conversion of ca. 3.3% at the end of
the reaction. Besides, the reaction efficiently proceeded on NiAlW,
which had a high catalytic performance with 19.7% glycerol conversion
to acetol and others products and no deactivation along of the time for
25 h of time on stream was observed. This was due to the stability of
the NiAlxOy, phase, which impeded phase transformation and was resistant
to heavy coking. (C) 2016 The Society of Powder Technology Japan.
Published by Elsevier B.V. and The Society of Powder Technology Japan.
All rights reserved.
