Jun Li

Xiamen University, Amoy, Fujian, China

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Publications (4)5.92 Total impact

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    ABSTRACT: A high-pressure polar light microscopy approach was proposed and developed to study the melt crystallization behaviors of myristic acid and ibuprofen respectively in CO2 at different pressures and crystallization temperatures. The crystallization kinetics was analyzed by the Avrami equation. Results revealed that the crystallization rates of both myristic acid and ibuprofen increased with the CO2 pressure, while the crystallization activation energy of ibuprofen decreased (more negative) with the increase of CO2 pressure at constant crystallization temperature. On the other hand, the crystallization rate of ibuprofen decreased with the increase of the crystallization temperature at fixed pressure. However, the presence of CO2 did not change the nucleation or growth patterns of myristic acid and ibuprofen, as indicated by the analyzed results of the Avrami equation. The X-ray diffraction (XRD) analysis further confirmed that CO2 had no influence on the crystal form of myristic acid or ibuprofen. This study revealed that the crystallization behaviors of myristic acid and ibuprofen were evidently different from those of polymers in CO2 reported in the literature.
    Journal of Supercritical Fluids The 03/2014; · 2.73 Impact Factor
  • Ref. No: CN102491396A, Year: 01/2012
  • Ref. No: CN 103112837A, Year: 01/2011
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    ABSTRACT: In this paper, the kinetics and mechanism of oxidation of benzyl alcohol with H2O2 over heterogeneous bio-reduced Au/TS-1 catalysts have been reported after eliminating mass transfer resistances. Langmuir–Hinshelwood and power-law kinetic models are applied to describe the experimental results of the catalytic oxidation. By fitting the kinetic data using the power-rate law model, the orders of the reaction with respect to benzyl alcohol, H2O2, benzaldehyde and catalyst were found to be 0.55, 0.22, −0.35 and 1.06, respectively, with an activation energy of 38.2 kJ mol−1 from an Arrhenius plot. These fractional orders indicate that the species were adsorbed on the catalyst surface leading to the product, benzaldehyde. Furthermore, the reaction mechanism derived from the Langmuir–Hinshelwood model is proposed; it gives a reasonable description of the oxidation rate, following a rate expression:.r=0.0119×[BzOH][H2O2](1+2.222×[BzOH]+2.330×[H2O2]+4.769×[BzH])2 (mol L−1 gcat−1 s−1).
    Journal of Molecular Catalysis A Chemical 366:215–221. · 3.19 Impact Factor