Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (7): 1383-1390.doi: 10.3866/PKU.WHXB201504292

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation of Manganese Oxides Supported on Graphene Catalysts and Their Activity in Low-Temperature NH3-SCR

JIAO Jin-Zhen1, LI Shi-Hui1, HUANG Bi-Chun1,2   

  1. 1 College of Environment and Energy, South China University of Technology, Guangzhou 510006, P. R. China;
    2 Key Laboratory of the Ministry of Education for Pollution Control and Ecosystem Restoration in Industry Clusters, South China University of Technology, Guangzhou 510006, P. R. China
  • Received:2015-01-07 Revised:2015-04-27 Published:2015-07-08
  • Contact: HUANG Bi-Chun E-mail:cebhuang@scut.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51478191).

Abstract:

Graphene oxide (GO) was synthesized using an improved Hummers method. Subsequently, catalysts of manganese oxides (at varying loadings) supported on graphene (MnOx/GR) were prepared by hydrothermal reaction for application in the selective catalytic reduction (SCR) of NOx with NH3 at low temperatures. The structural properties and catalytic performance were evaluated by Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, X-ray powder diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption-desorption, X-ray photoelectron spectroscopy (XPS), and H2 temperature-programmed reduction (H2-TPR). The characterization results indicated that abundant functional groups existed on the surface of the prepared GO that could combine with manganese during preparation of the catalysts. Manganese oxide entities, with different crystallinities (MnO, Mn3O4, or MnO2), were dispersed on the surface of graphene. The results of the catalytic studies showed that the MnOx/GR catalysts prepared with different MnOx loadings all exhibited excellent low-temperature SCR activities. The catalyst with 20%(w) MnOx displayed the best activity, which was attributed to the high content of high-valent manganese and oxygen adsorbed onto the catalyst surface, as well as to the enhancement in redox abilities and the addition of active sites at low temperatures.

Key words: Selective catalytic reduction, Nitrogen oxide, Graphene, Graphene oxide, Manganese oxide

MSC2000: 

  • O643