Kinetic study of hydrodeoxygenation of stearic acid as model compound for renewable oils
Journal article, 2019

The kinetics during hydrodeoxygenation (HDO) of stearic acid (SA) was investigated to explore the fundamental chemistry and the reaction scheme involved for the reaction with a sulfide NiMo/Al2O3catalyst. Intermediates like octadecanal (C18 O) and octadecanol (C18 OH) were used to resolve the reaction scheme and explain the selectivity for the three major reaction routes (decarboxylation, decarbonylation and direct-HDO). Several reaction parameters, like temperature, pressure, feed concentration and batch-reactor stirring rate, were explored for their effect on changes in rate of conversion and selectivity. A weaker dependence on pressure (40–70 bar) and strong dependence on temperature (275–325 °C) was found for the product distribution during HDO of SA. A model based on Langmuir–Hinshelwood type kinetics was developed to correlate the experimental data. The model well predicted trends in variation of selectivities with the reaction conditions, in part by including intermediates like octadecanol and octadecanal and it predicted phenomenon like inhibiting effects of the fatty acid. The proposed kinetic model is expected to be applicable to liquid phase HDO of different renewable feeds containing long chain fatty acids, methyl esters and triglycerides etc.


Prakhar Arora

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Eva Lind Grennfelt


Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Derek Creaser

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Chemical Engineering Journal

0300-9467 (ISSN)

Vol. 364 376-389

The Competence Centre for Catalysis, KCK

Swedish Energy Agency, 2018-01-01 -- 2021-12-31.

Volvo Group (22490-4), 2018-01-01 -- 2021-12-31.

ECAPS AB, 2018-01-01 -- 2021-12-31.

Volvo Cars (22490-4), 2018-01-01 -- 2021-12-31.

Umicore (22490-4), 2018-01-01 -- 2021-12-31.

Johnson Matthey AB (22490-4), 2018-01-01 -- 2021-12-31.

Chalmers (22490-4), 2018-01-01 -- 2021-12-31.

Scania CV AB (22490-4), 2018-01-01 -- 2021-12-31.

Preem (22490-4), 2018-01-01 -- 2021-12-31.

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