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Citation: HU Hui-min, CHENG Le-ming, ZHANG Rong, BI Ji-cheng. Effect of CaO on decarboxylation of stearic acid over Pt/C catalyst[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(7): 850-855. shu

Effect of CaO on decarboxylation of stearic acid over Pt/C catalyst

  • 1.

    1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

  • Corresponding author: ZHANG Rong, 
  • Received Date: 19 March 2013
    Available Online: 27 May 2013

    Fund Project: 国家自然科学基金青年科学基金(21006123). (21006123)

  • The effects of CaO addition and temperature on decarboxylation of stearic acid over Pt/C catalyst in subcritical water were investigated. The conversion of stearic acid increased dramatically, while the selectivity to heptadecane hardly changed with the addition of CaO. At 330 ℃ the conversion of stearic acid reached a maximum with Ca/stearic mol ratio of 0.5. Moreover, Pt/C catalyzed decarboxylation of stearic acid in subcritical water exhibited first-order kinetics. It was proposed that dissociative stearic acid was adsorbed on Pt/C catalyst, forming surface octadecanoate species and adsorbed H. The C-C bond dissociated via H insertion, resulting in the formation of heptadecane and CO2. The addition of CaO promoted the dissociation of stearic acid. As a result, the amount of adsorbed octadecanoate increased and the reaction was accelerated.
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