Highly dispersed MnOx nanoparticles supported on three-dimensionally ordered macroporous carbon: a novel nanocomposite for catalytic reduction of NOx with NH3 at low temperature

摘要

In this paper, we report a novel nanocomposite of MnOx nanoparticles supported by three-dimensionally ordered macroporous carbon (MnOx/3DOMC) fabricated by means of a simple multi-component infiltration of three-dimensional templates and its use as a catalyst for low-temperature selective catalytic reduction (SCR) of NOx with NH3. Several techniques, including scanning electron microscopy, X-ray diffraction, N-2-sorption, transmission electron microscopy, X-ray photoelectron spectroscopy, NH3 temperature-programmed desorption, and H-2 temperature-programmed reduction, are employed to characterize the MnOx/3DOMC nanocomposite. The results demonstrate that MnOx/3DOMC possesses a highly ordered macroporous structure with hierarchical mesopores in the walls of the macroporous skeleton. MnOx nanoparticles of 2-4 nm are observed to be highly dispersed on the 3DOM carbon scaffold. Compared with the MnOx/NAC and MnOx/TiO2 catalysts prepared by a conventional impregnation method, the MnOx/3DOMC catalyst exhibits better low-temperature NH3-SCR activity, stability, and water vapor and/or SO2 resistance ability. Such material represents a promising exploratory direction for enhancing the catalytic performance of metal oxide-based NH3-SCR catalysts.