Isomerization of n-heptane over Ni–WOx/SiO2–Al2O3 catalysts
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Date
2003
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Abstract
Isomerization of n-heptane over Ni–WOx/Al2O3–SiO2 catalysts was carried out in a continuous flow fixed-bed reactor under atmospheric
pressure. The first part of this study deals with the preparation of two series of catalysts (A and B) by the sol–gel method, while the second
part deals with the isomerization of n-heptane. The principal objective of this study was to choose the catalyst giving the best isomer yield (diand
tri-branched ones) with optimum reaction conditions (reaction temperature, reduction temperature and time on stream). From the
results obtained, the optimum nickel content was found to be 15 wt% and it seems that the incorporation of tungsten (B series) leads to
a significant enhancement in the activity of the prepared catalysts. After running on stream for 100 min, the catalyst with 15% nickel and
10% tungsten (B4 catalyst) gives the best results (29% conversion and 70% selectivity) at 250 8C.
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Keywords
catalysts, gasoline, pollution, octane number