A1 Refereed original research article in a scientific journal
Hydrodeoxygenation of stearic acid and tall oil fatty acids over Ni-alumina catalysts: Influence of reaction parameters and kinetic modelling
Authors: Klara Jenistová, Imane Hachemi, Päivi Mäki-Arvela, Narendra Kumar, Markus Peurla, Libor Capek, Johan Wärnå, Dmitry Yu. Murzin
Publisher: ELSEVIER SCIENCE SA
Publication year: 2017
Journal: Chemical Engineering Journal
Journal name in source: CHEMICAL ENGINEERING JOURNAL
Journal acronym: CHEM ENG J
Volume: 316
First page : 401
Last page: 409
Number of pages: 9
ISSN: 1385-8947
eISSN: 1873-3212
DOI: https://doi.org/10.1016/j.cej.2017.01.117
Abstract
Kinetics in the hydrodeoxygenation of stearic acid was investigated over Ni-gamma-Al2O3 catalyst. The main variables were catalyst prereduction mode, reaction atmosphere and hydrogen pressure in the total pressure range of 7-30 bar. The results revealed that high conversion, 99% in 360 min and high selectivity to heptadecane, 97% were achieved at 300 degrees C under 30 bar total pressure. The yield of an intermediate hydrogenation product, stearyl alcohol increased with increasing hydrogen pressure as expected. Higher reaction rates and conversion levels were also achieved with the prereduced catalyst and carrying out the reaction in the presence of hydrogen. As a comparison to stearic acid, hydrodeoxygenation of tall oil fatty acids, an industrial feedstock was successfully demonstrated with Ni-gamma-Al2O3 under the same conditions. A kinetic model including the pressure effect was derived and applied for data with Ni-gamma-Al2O3 as well as for Pd/C, Ni-H-Y-80 and Ni/SiO2 catalysts. The model described well the kinetic data. (C) 2017 Elsevier B.V. All rights reserved.
Kinetics in the hydrodeoxygenation of stearic acid was investigated over Ni-gamma-Al2O3 catalyst. The main variables were catalyst prereduction mode, reaction atmosphere and hydrogen pressure in the total pressure range of 7-30 bar. The results revealed that high conversion, 99% in 360 min and high selectivity to heptadecane, 97% were achieved at 300 degrees C under 30 bar total pressure. The yield of an intermediate hydrogenation product, stearyl alcohol increased with increasing hydrogen pressure as expected. Higher reaction rates and conversion levels were also achieved with the prereduced catalyst and carrying out the reaction in the presence of hydrogen. As a comparison to stearic acid, hydrodeoxygenation of tall oil fatty acids, an industrial feedstock was successfully demonstrated with Ni-gamma-Al2O3 under the same conditions. A kinetic model including the pressure effect was derived and applied for data with Ni-gamma-Al2O3 as well as for Pd/C, Ni-H-Y-80 and Ni/SiO2 catalysts. The model described well the kinetic data. (C) 2017 Elsevier B.V. All rights reserved.
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