期刊
CATALYSTS
卷 8, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/catal8030100
关键词
MnOx-Fe2O3/vermiculite; monolithic honeycomb catalyst; room-temperature catalysis; selective catalytic reduction; NO removal efficiency
资金
- National High Technology Research and Development Program of China (863 program) [2015AA03A401]
- Program of Science and Technology Innovation Team in Bingtuan [2015BD003]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT 15R46]
Selective catalytic reduction of NOx by ammonia (NH3-SCR) was the most efficient and economic technology for De-NOx applications. Therefore, a series of MnOx/vermiculite (VMT) and MnOx-Fe2O3/VMT catalysts were prepared by an impregnation method for the selective catalytic reduction (SCR) of nitrogen oxides (NOx). The MnOx-Fe2O3/VMT catalysts provided an excellent NO conversion of 96.5% at 200 degrees C with a gas hourly space velocity (GHSV) of 30,000 h(-1) and an NO concentration of 500 ppm. X-ray photoelectron spectroscopy results indicated that the Mn and Fe oxides of the MnOx-Fe2O3/VMT catalyst were mainly composed of MnO2 and Fe2O3. However, the MnO2 and Fe2O3 components were well dispersed because no discernible MnO2 and Fe2O3 phases were observed in X-ray powder diffraction spectra. Corresponding MnOx-Fe2O3/VMT monolithic honeycomb catalysts (MHCs) were prepared by an extrusion method, and the MHCs achieved excellent SCR activity at low temperature, with an NO conversion greater than 98.6% at 150 degrees C and a GHSV of 4000 h(-1). In particular, the MnOx-Fe2O3/VMT MHCs provided a good SCR activity at room temperature (20 degrees C), with an NO conversion of 62.2% (GHSV = 1000 h(-1)). In addition, the NO reduction performance of the MnOx-Fe2O3/VMT MHCs also demonstrated an excellent SO2 resistance.
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