Iron-doped Mn-Ce/TiO2 catalyst for low temperature selective catalytic
reduction of NO with NH3 |
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Authors: | Boxiong Shen Ting Liu Ning Zhao Xiaoyan Yang and Lidan Deng |
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Institution: | College of Environmental Science and Engineering,Nankai University,Tianjin 300071,China |
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Abstract: | The catalysts of iron-doped Mn-Ce/TiO2 (Fe-Mn-Ce/TiO2) prepared by sol-gel method were investigated for low temperature
selective catalytic reduction (SCR) of NO with NH3. It was found that the NO conversion over Fe-Mn-Ce/TiO2 was obviously improved
after iron doping compared with that over Mn-Ce/TiO2. Fe-Mn-Ce/TiO2 with the molar ratio of Fe/Ti = 0.1 exhibited the highest
activity. The results showed that 96.8% NO conversion was obtained over Fe(0.1)-Mn-Ce/TiO2 at 180°C at a space velocity of 50,000
hr??1. Fe-Mn-Ce/TiO2 exhibited much higher resistance to H2O and SO2 than that of Mn-Ce/TiO2. The properties of the catalysts were
characterized using X-ray di raction (XRD), N2 adsorption, temperature programmed desorption (NH3-TPD and NOx-TPD), and Xray
photoelectron spectroscopy (XPS) techniques. BET, NH3-TPD and NOx-TPD results showed that the specific surface area and NH3
and NOx adsorption capacity of the catalysts increased with iron doping. It was known from XPS analysis that iron valence state on the
surface of the catalysts were in Fe3+ state. The doping of iron enhanced the dispersion and oxidation state of Mn and Ce on the surface
of the catalysts. The oxygen concentrations on the surface of the catalysts were found to increase after iron doping. Fe-Mn-Ce/TiO2
represented a promising catalyst for low temperature SCR of NO with NH3 in the presence of H2O and SO2. |
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Keywords: | low-temperature SCR Fe-Mn-Ce/TiO2 H2O SO2 |
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