Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 22, Issue 9, Pages 1447-1454Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(09)60274-6
Keywords
low-temperature SCR; Fe-Mn-Ce/TiO2; H2O; SO2
Categories
Funding
- National Natural Science Foundation of China [90610018, 50976050]
- New Century Excellent Talents in University [NCET-07-0457]
- National Key Technologies R&D Program of Tianjin [09ZCKFSH01900]
Ask authors/readers for more resources
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 degrees C at a space velocity of 50,000 hi(-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 diffraction (XRD), N-2 adsorption, temperature programmed desorption (NH3-TPD and NOx-TPD), and X-ray 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available