Influence of the Reduction Temperature and the Nature of the Support on the Performance of Zirconia and Alumina-Supported Pt Catalysts for n-Dodecane Hydroisomerization

Catalysts based on zirconia- and alumina-supported tungsten oxides (15 wt % W) with a small loading of platinum (0.3 wt % Pt) were selected to study the influence of the reduction temperature and the nature of the support on the hydroisomerization of n-dodecane. The reduction temperature has a major...

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Bibliographic Details
Published in:Catalysts 2021-01, Vol.11 (1), p.88
Main Authors: García-Pérez, Diana, Alvarez-Galvan, Maria Consuelo, Campos-Martin, Jose M., Fierro, Jose L. G.
Format: Article
Language:English
Subjects:
acidity
Alumina
Aluminum oxide
Ammonia
Biodiesel fuels
Biofuels
Catalysts
Catalytic activity
Chemical reactions
Dodecane
Hydrocarbons
Hydrogenation
hydroisomerization
n-dodecane
Oils & fats
Platinum
Pore size
reduction temperature
Selectivity
sequential wetness impregnation method
Sulfur
Surface area
Tungsten
Vegetable oils
Zirconium dioxide
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Summary:Catalysts based on zirconia- and alumina-supported tungsten oxides (15 wt % W) with a small loading of platinum (0.3 wt % Pt) were selected to study the influence of the reduction temperature and the nature of the support on the hydroisomerization of n-dodecane. The reduction temperature has a major influence on metal dispersion, which impacts the catalytic activity. In addition, alumina and zirconia supports show different catalytic properties (mainly acid site strength and surface area), which play an important role in the conversion. The NH3-TPD profiles indicate that the acidity in alumina-based catalysts is clearly higher than that in their zirconia counterparts; this acidity can be attributed to a stronger interaction of the WOx species with alumina. The PtW/Al catalyst was found to exhibit the best catalytic performance for the hydroisomerization of n-dodecane based on its higher acidity, which was ascribed to its larger surface area relative to that of its zirconia counterparts. The selectivity for different hydrocarbons (C7–10, C11 and i-C12) was very similar for all the catalysts studied, with branched C12 hydrocarbons being the main products obtained (~80%). The temperature of 350 °C was clearly the best reduction temperature for all the catalysts studied in a trickled-bed-mode reactor.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal11010088