Synthesis of magnetic Pb/Fe3O4/SiO2 and its catalytic activity for propylene carbonate synthesis via urea and 1,2-propylene glycol

Hualiang AN; Xinqiang ZHAO; Zhiguang JIA; Changcheng WU; Yanji WANG

doi:10.1007/s11705-009-0055-2

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Front. Chem. Sci. Eng. ›› 2009, Vol. 3 ›› Issue (2) : 215-218. DOI: 10.1007/s11705-009-0055-2

RESEARCH ARTICLE

Synthesis of magnetic Pb/Fe₃O₄/SiO₂ and its catalytic activity for propylene carbonate synthesis via urea and 1,2-propylene glycol

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Abstract

To facilitate the recovery of Pb/SiO₂ catalyst, magnetic Pb/Fe₃O₄/SiO₂ samples were prepared separately by emulsification, sol-gel and incipient impregnation methods. The catalyst samples were characterized by means of X-ray diffraction and N₂ adsorption-desorption, and their catalytic activity was investigated in the reaction for synthesizing propylene carbonate from urea and 1,2-propylene glycol. When the gelatin was applied in the preparation of Fe₃O₄ at 60°C and the pH value was controlled at 4 in the preparation of Fe₃O₄/SiO₂, the Pb/Fe₃O₄/SiO₂ sample shows good catalytic activity and magnetism. Under the reaction conditions of a reaction temperature of 180°C, reaction time of 2 h, catalyst percentage of 1.7 wt-% and a molar ratio of urea to PG of 1∶4, the yield of propylene carbonate attained was 87.7%.

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Pb/Fe₃O₄/SiO₂ magnetic particle / urea / 1 / 2-propylene glycol / propylene carbonate

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Hualiang AN, Xinqiang ZHAO, Zhiguang JIA, Changcheng WU, Yanji WANG. Synthesis of magnetic Pb/Fe₃O₄/SiO₂ and its catalytic activity for propylene carbonate synthesis via urea and 1,2-propylene glycol. Front Chem Eng Chin, 2009, 3(2): 215‒218 https://doi.org/10.1007/s11705-009-0055-2

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Acknowledgements

This work has been supported by the National Natural Science Foundation of China (Grant No. 20576025) and the Hebei Provincial Fund for Natural Science (B2007000010).