Chinese Journal of Catalysis ›› 2014, Vol. 35 ›› Issue (12): 1927-1936.DOI: 10.1016/S1872-2067(14)60129-7

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Formaldehyde catalytic oxidation over hydroxyapatite modified with various organic molecules

Yahui Suna, Zhenping Qua, Dan Chena, Hui Wanga, Fan Zhangb, Qiang Fub   

  1. a. Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian116024, Liaoning, China;
    b. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2014-04-13 Revised:2014-04-28 Online:2014-11-29 Published:2014-11-29
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21377016), the Fundamental Research Funds for the Central Universities (DUT13LK27), and the Program for Changjiang Scholars and Innovative Research Team in University (IRT_13R05).

Abstract:

Hydroxyapatite (HAP) was modified by adding various organic molecules, such as cetyltrimethylammonium bromide, sodium dodecyl sulfate, and sodium citrate, during the precipitation of HAP. Sodium citrate-modified HAP displayed the best activity for formaldehyde oxidation, achieving complete conversion at 240 ℃. The influence of the organic modifiers on the structure of HAP was assessed by X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption- desorption, scanning electron microscopy, and thermogravimetry/derivative thermogravimetry. The higher specific surface area and pore volume, and smaller pores, owing to modification with sodium citrate, favored adsorption, mass transfer, and interaction process during formaldehyde oxidation. Furthermore, the higher hydroxyl group content observed in sodium citrate- modified HAP enhanced interactions between formaldehyde and HAP, thus resulting in higher catalytic activity.

Key words: Modified hydroxyapatite, Sodium citrate, Specific surface area, Hydroxyl group, Formaldehyde catalytic oxidation