Deoxygenation of dilute and concentrated stearic acid over 2% Pd/C beads was performed in a continuous reactor at 300 degrees C and 20 bar pressure of Ar or 5% H-2/Ar. Stable operation was obtained in 5% H-2 atmosphere, with 95% conversion of 10 mol % dilute stearic acid in dodecane and 12% conversion of pure stearic acid. Deactivation took place in H-2-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.
Madsen, A. T., Rozmyslowicz, B., Simakova, I., Kilpiö, T. T., Leino, A-R., Kordás, K., Eränen, K., Mäki-Arvela, P., & Murzin, D. Y. (2011). Step changes and deactivation behaviour in the continuous decarboxylation of stearic acid. Industrial & Engineering Chemistry Research, 50(19), 11049-11058. https://doi.org/10.1021/le201273n