Study on Performance of Transition Metal-Doped Catalysts for DeNOx at Low-Temperature

Abstract:

Mn-Ce based catalysts doped with transition metal were synthesized via a sol-gel method for low-temperature Selective catalytic reduction DeNOx. NOx conversion of these catalysts was evaluated under 100 ^OC-300 ^OC. H₂-Temperature Programmed Reduction was used to investigate the reduction capability effect on NOx conversion. On this basis, sulfur resistance of catalysts was analyzed and Fourier Transform Infrared (FI-IR) spectra were used to discuss sulfur poisoning mechanism of catalysts. The results indicated that NOx conversion of catalysts was Mn-Ce-W_0.03 Mn-Ce-Y_0.03 > Mn-Ce-Zr_0.03 > Mn-Ce >Mn-Ce-La_0.03 > Mn-Ce-Pr_0.03.W, Zr, Y elements was doped to improve catalytic activity at low-temperature and enhance anti-sulfur ability of catalysts. Especially, W element can restrain sulfate formation and reduce the channel blocking of the catalyst and Mn-Ce-W_0.03 catalyst displays optimal performance of resistance to sulfur poisoning.

• Periodical: Advanced Materials Research (Volume 873)
• Pages: 612-618
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.873.612
• Online since: December 2013
• Authors: Jin Shuo Qiao*, Cui Ya Zhang, Xiao Ju Yin, Ke Ning Sun
• Keywords: Low-Temperature, Mn-Based Catalyst, Selective Catalytic Reduction DeNOx, Sulfur Resistance

References

[1] GB13223-2011. Coal-fired power plant air pollutants emission standards[S].

[2] Xu X, Chen C，Qi H，et al. Development of Coal Combustion Pollution Control for SO2 and NOx in China[J]. Fuel Processing Tech, 2000, 62(2-3), p.153.

DOI: 10.1016/s0378-3820(99)00116-2

[3] Nakajima F, Hamada I. The State of the Art Technology of NOx Control[J]. Catal Today, 1996, 29, p.109.

[4] Jiang B Q, Liu Y, Wu Z B. Low-temperature Selective Catalytic Reduction of NO on MnOX/TiO2 Prepared by Different Methods[J]. Journal of Hazardous Materials, 2009, 162(2/3), p.1249.

DOI: 10.1016/j.jhazmat.2008.06.013

[5] Wu Z B, Jin R B, Liu Y, et al. Ceria Modified MnOX/TiO2 as a Superior Catalyst for NO Reduction with NH3 at Low-temperature [J]. Catalysis Communications, 2008, 9(13), p.2217.

DOI: 10.1016/j.catcom.2008.05.001

[6] Kapteijn F, Singoredjo L, Andreini A, Moulijn J A. Activity and Selectivity of Pure Manganese Oxide in the Selective Catalytic Reduction of Nteric-Oxide with Ammonia [J]. Applied Catalysis B：Environmental, 1994, 93(3), p.173.

DOI: 10.1016/0926-3373(93)e0034-9

[7] Zhu Z P, Liu Z Y, Niu H X, et al. Mechanism of SO2 Promotion for NO Reduction with NH3 over Activated Carbon-supported Vanadium Oxidecatalyst[J]. Journal of Catalysis, 2001, 197, p.6.

DOI: 10.1006/jcat.2000.3052

[8] Md. Azhar Uddin, Koji Ishibe, et al. Effects of SO2 on NO Adsorption and NO2 Formation over TiO2 Low-Temperature SCR Catalyst[J]. Ind. Eng. Chem. Res. , 2007, 46(6), p.1672.

DOI: 10.1021/ie061631q

[9] Wu D W, Zhang Q L, Lin T, et al. CexTi1-xO2 Supported Manganese-Based Catalyst: Preparation and Catalytic Performance for Selective Reduction of NO with NH3 at Lower Temperature[J]. Chinese Journal of Inorganic Chemisitry, 2011, 27(1), p.53.

[10] Wu Z B, Jin R B, Wang H Q, et al. Effect of Ceria Doping on SO2 Resistance of Mn/TiO2 for Selective Catalytic Reduction of NO with NH3 at low temperature [ J]. Catalysis Communications, 2009, (10), p.935.

DOI: 10.1016/j.catcom.2008.12.032

[11] Othman I, Mohamed R M, Ibrahem F M. Study of Photocatalytic Oxidation of Indigo Carmine Dye on Mn-supported TiO2[J]. Journal of Photochemistry and Photobiology A: Chemistry, 2007, 189(1), p.82.

DOI: 10.1016/j.jphotochem.2007.01.010

[12] Topsoe N Y. Mechanism of the Selective Catalytic Reduction of Nitric Oxide by Ammonia Elucidated by in Situ On-Line Fourier Transform Infrared Spectroscopy[J]. Science, 1994, 265, p.1217.

DOI: 10.1126/science.265.5176.1217

[13] Wu Z, Jiang B, Liu Y, Wang H, Jin R. DRIFT Study of Manganese／Titania-based Catalysts for Low-temperature Selective Catalytic Reduction of NO with NH3[J]. Environ. Sci. Technol. , 2007, 41, p.5812.

DOI: 10.1021/es0700350