Step Changes and Deactivation Behavior in the Continuous Decarboxylation of Stearic Acid

Anders Theilgaard Madsen, Bartosz Rozmysłowicz, Irina L. Simakova, Teuvo Kilpiö, Anne-Riikka Leino, Krisztián Kordás, Kari Eränen, Päivi Mäki-Arvela, Dmitry Yu. Murzin

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Abstract

Deoxygenation of dilute and concentrated stearic acid over 2% Pd/C beads was performed in a continuous reactor at 300 °C and 20 bar pressure of Ar or 5% H2/Ar. Stable operation was obtained in 5% H2 atmosphere, with 95% conversion of 10 mol % dilute stearic acid in dodecane and 12% conversion of pure stearic acid. Deactivation took place in H2-deficient gas atmosphere, probably as a result of the formation of unsaturated products and coking in the pore system. Transient experiments with step changes were performed: 1 h was required for the step change to be visible in liquid sampling, whereas steady states were achieved after a total of 2.5–3 h. Postreaction analysis of the spent catalyst revealed that a deactivation profile was formed downward over the catalyst bed.
Original languageEnglish
JournalIndustrial & Engineering Chemistry Research
Volume50
Issue number19
Pages (from-to)11049-11058
ISSN0888-5885
DOIs
Publication statusPublished - 2011

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