MnOx/MWCNTs低温氨选择性催化还原NOx硫中毒机理

doi:10.3866/PKU.WHXB201207062

Abstract

Abstract:

Manganese oxides supported on multi-walled carbon nanotubes (MnO_x/MWCNTs) catalysts were prepared by pore volume impregnation using MWCNTs as the catalyst support which was pretreated by concentrated nitric acid and oxygen dielectric barrier discharge plasma. The catalysts were characterized by thermogravimetric analysis (TGA), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction/desorption (TPR/ TPD), and Fourier transform infrared (FTIR) spectroscopy. The effect of SO₂ on the activity of the catalysts for low-temperature selective catalytic reduction (SCR) of NOx by ammonia and the SO₂ poisoning mechanism were investigated. The results showed that SO₂ had an obvious poisoning effect on the SCR activity of MnO_x/MWCNTs at low temperature. The activity decreased more rapidly as reaction temperature and SO₂ concentration increased. The observed deactivation was attributed to the sulfation of the active center atoms. Formation of ammonium sulfate on the catalyst surface and the inhibiting effect of SO₂ on NO adsorption also resulted in the deactivation of the catalysts to some extent.

Key words: Multi-walled carbon nanotubes, Selective catalytic reduction, Sulfur dioxide, Poisoning mechanism

LUO Hong-Cheng, HUANG Bi-Chun, FU Ming-Li, WU Jun-Liang, YE Dai-Qi. SO₂ Deactivation Mechanism of MnO_x/MWCNTs Catalyst for Low-Temperature Selective Catalytic Reduction of NOx by Ammonia[J]. Acta Phys. -Chim. Sin. 2012, 28(09), 2175-2182. doi: 10.3866/PKU.WHXB201207062

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SO₂ Deactivation Mechanism of MnO_x/MWCNTs Catalyst for Low-Temperature Selective Catalytic Reduction of NOx by Ammonia

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SO₂ Deactivation Mechanism of MnO_x/MWCNTs Catalyst for Low-Temperature Selective Catalytic Reduction of NOx by Ammonia