Petroleum like biodiesel production by catalytic decarboxylation of oleic acid over Pd/Ce-ZrO2 under solvent-free condition

[Display omitted] •Varying the Ce/Zr ratio effectively tunes the concentration of oxygen vacancies.•High Pd dispersion and oxygen vacancy concentrations lead to enhanced activity.•The catalyst deactivation was mainly caused by Pd sintering.•Decarboxylation was found to be the main pathway in this re...

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Published in:Applied catalysis. A, General General, 2018-08, Vol.563, p.163-169
Main Authors: Shim, Jae-Oh, Jang, Won-Jun, Jeon, Kyung-Won, Lee, Da-We, Na, Hyun-Suk, Kim, Hak-Min, Lee, Yeol-Lim, Yoo, Seong-Yeun, Jeon, Byong-Hun, Roh, Hyun-Seog, Ko, Chang Hyun
Format: Article
Language:English
Subjects:
Ce/Zr ratio
Decarboxylation
Oxygen vacancy
Solvent-free
Sustainable biodiesel
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Summary:[Display omitted] •Varying the Ce/Zr ratio effectively tunes the concentration of oxygen vacancies.•High Pd dispersion and oxygen vacancy concentrations lead to enhanced activity.•The catalyst deactivation was mainly caused by Pd sintering.•Decarboxylation was found to be the main pathway in this reaction. The Ce/Zr ratio of Pd/Ce-ZrO2 catalysts was systematically changed in order to investigate the effect of oxygen vacancy concentration on their decarboxylation activityunder solvent-free conditions for potential sustainable petroleum like biodiesel production. Pd/Ce0.5Zr0.5O2 exhibited the highest catalytic activity from all other tested catalysts because it contained the highest oxygen vacancy concentration and Pd dispersion, as shown by the X-ray photoelectron spectroscopy, Raman spectroscopy, and CO-chemisorption data. A catalyst deactivation study also showed that both the Pd dispersion and the oxygen vacancy concentration influences the catalytic activity.The catalyst deactivation was found to occur mainly due to Pd sintering, decreases in the BET surface area and Pd dispersion, and partially due to the loss of oxygen vacancies.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2018.07.005