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Promotional effect of Ce on the SCR of NO with NH3 at low temperature over MnO<italic>x</italic> supported by nitric acid-modified activated carbon.
- Source :
-
Research on Chemical Intermediates . Mar2018, Vol. 44 Issue 3, p1729-1744. 16p. 2 Charts, 7 Graphs. - Publication Year :
- 2018
-
Abstract
- Different amounts of Mn and Ce oxides were loaded onto nitric acid-modified activated carbon (ACN) by wet impregnation. The series of catalysts were employed for the selective catalytic reduction of NO<italic>x</italic> by NH3 at temperatures between 100 and 250 °C. Cerium-modified catalysts exhibited higher de-NO<italic>x</italic> performance than those modified with Mn/ACN, even with the same total loadings. The precursor solution with a molar ratio for Ce/(Mn + Ce) of 0.4 exhibited the highest catalytic activity. Enhanced resistance to SO2 and H2O and better stability were observed for 10%Mn–Ce(0.4)/ACN relative to 10%Mn/ACN. The catalysts were further characterized by N2 physisorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), hydrogen temperature-programmed reduction (H2-TPR), and temperature-programmed desorption of ammonia (NH3-TPD). The N2 physisorption and XRD results suggested that co-doping Ce with Mn increased the surface area and promoted the dispersion of Mn–Ce binary metal oxides. H2-TPR the NH3-TPD results demonstrated that the interaction between manganese oxide and cerium oxide species enhanced the redox and surface acidity of 10%Mn–Ce(0.4)/ACN. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09226168
- Volume :
- 44
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Research on Chemical Intermediates
- Publication Type :
- Academic Journal
- Accession number :
- 128053387
- Full Text :
- https://doi.org/10.1007/s11164-017-3194-y