Mechanism of ultrasonic-assisted oil-conjugated reaction using solid nickel catalyst
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The mechanism of ultrasonic-assisted oil-conjugated reaction with solid catalyst was investigated here. Experiment results illustrated that the linoleic acid molecule could not spontaneously convert itself into the end product, conjugated linoleic acid, in the absence of catalyst due to the higher activation energy required for this process. The addition of Ni powder to the oil ensured that the course of reaction completely proceeded, originating from the ability of Ni catalyst to adsorb H radicals on its surface to generate a stable and longer-lived substance, Ni[H·] n particles. Ultrasonic irradiation contributed to enhance the decomposition reaction of linoleic acid to release larger numbers of H radicals, and boost the effective collisions between Ni[H·] n particle and the intermediate with conjugated double bonds. Furthermore, when the acoustic cavitation arose, the reaction between H radicals and intermediates merely occurred in the gas-liquid interface of cavitation bubbles.
KeywordsLinoleic Acid Cavitation Jatropha Cavitation Bubble Catalyst Loading
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- 25.Yang, R.-F., Deng, Q.-Q., and Yan, J., Asian J. Chem., 2013, vol. 25, p. 6316.Google Scholar