1. 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.
- Author
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Jiang, Li Jun, Liu, Qing Cai, Zhao, Qi, Ren, Shan, Kong, Ming, Yao, Lu, and Meng, Fei
- Subjects
CATALYTIC reduction ,NITRIC oxide ,LOW temperatures ,CATALYST supports ,ACTIVATED carbon ,NITRIC acid - 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
by NHx 3 at temperatures between 100 and 250 °C. Cerium-modified catalysts exhibited higher de-NO 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 SOx 2 and H2 O 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]- Published
- 2018
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