Research of Catalytic Performance over Transition Metal Modified MnO_x-CeO_x/ACF Catalysts

Abstract:

The catalyst of MnO_x-CeO_x/ACF prepared by impregnation method was used for low-temperature selective catalytic reduction (SCR) of NO with NH₃, and more than 90% NO conversion was obtained at 230°C. Fe、Cu or V was used respectively to prepare transition metal modified MnO_x-CeO_x/ ACF catalysts which had lower catalytic activity than that over MnO_x-CeO_x/ACF. SEM, N2 adsorption and NH₃-TPD were used to analyze the catalysts. The results showed that transition metal modified catalysts had a reduced surface area, pore volume and surface acidity. SO₂ had a negative effect on SCR performance of the catalysts. Fe modified catalyst exhibited SO₂ tolerance in the first 6h in the presence of 100ppm SO₂. Thermal treatment in N₂ at 350°C was used to regenerate the deactivated catalysts by SO₂. The decomposition of ammonium salts recovered the catalytic activity to some extent. The sulfated active components in deactivated catalysts after the thermal treatment enhanced the surface acidity of the catalysts.

• Periodical: Advanced Materials Research (Volumes 383-390)
• Pages: 1945-1950
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.383-390.1945
• Online since: November 2011
• Authors: Bo Xiong Shen, Ting Liu, Ning Zhao, Juan Ma, Xiao Cui Hao
• Keywords: Low-Temperature Selective Catalytic Reduction (SCR), MnO_x-CeO_x/ACF, NO, SO₂

References

[1] M. Yoshikawa, A. Yasutake, I. Mochida, Low Temperature Selective Catalytic Reduction of NOx by Metal Oxides Supported on Active Carbon Fibers, Applied Catalysis A: General, vol. 173, Oct. 1998, pp.239-245.

DOI: 10.1016/s0926-860x(98)00182-3

[2] G. Marbán, R. Antuña, A.B. Fuertes, Low-temperature SCR of NOx with NH3 over Activated Carbon Fiber Composite-supported Metal Oxides, Applied Catalysis B: Environmental, vol. 41, Mar. 2003, pp.323-338.

DOI: 10.1016/s0926-3373(02)00170-4

[3] G. Marbán, A.B. Fuertes, Low-temperature SCR of NOx with NH3 over Nomex™ Rejects-based Activated Carbon Fiber Composite-supported Manganese Oxides: Part II. Effect of Procedures for Impregnation and Active Phase Formation, Applied Catalysis B: Environmental, vol. 34, Oct. 2001, pp.55-71.

DOI: 10.1016/s0926-3373(01)00197-7

[4] Y.Q. Hou, Z.G. Huang, S.J. Guo, Effect of SO2 on V2O5/ACF Catalysts for NO Reduction with NH3 at Low Temperature, Catalysis Communications, vol. 10, Jun. 2009, pp.1538-1541.

DOI: 10.1016/j.catcom.2009.04.003

[5] B.X. Shen, T. Liu, Z.L. Shi, J.W. Shi, T.T. Yang, N. Zhao, Low-temperature Selective catalytic reduction of NO with NH3 based on MnOx-CeOx/ACFN, Frontiers of Chemical Engineering in China, vol. 2, Sep. 2008, pp.325-329.

DOI: 10.1007/s11705-008-0053-9

[6] Z.B. Wu, B.Q. Jiang, Y. Liu, Experimental Study on a Low-temperature SCR Catalyst Based on MnOx/TiO2 Prepared by Sol-Gel Method, Journal of Hazardous Materials, vol. 145, Jul. 2007, pp.488-494.

DOI: 10.1016/j.jhazmat.2006.11.045

[7] G.S. Qi, R.T. Yang, R. Chang, MnOx-CeO2 Mixed Oxides Prepared by Co-precipitation for Selective Catalytic Reduction of NO with NH3 at Low Temperatures, Applied Catalysis B: Environmental, vol. 51, Jul. 2004, pp.93-106.

DOI: 10.1016/j.apcatb.2004.01.023

[8] I.S. Nam, J.W. Eldridge, J.R. Kittrell, Deactivation of a Vanadia-alumina Catalyst for Nitric Oxide Reduction by Ammonia, Industry ﹠Engineering Chemistry Product Research Development, vol. 25, Jun. 1986, pp.192-197.

DOI: 10.1021/i300022a012

[9] W.S. Kijlstra, M. Biervliet, E.K. Poels, A. Bliek, Deactivation by SO2 of MnOx/Al2O3 Catalysts Used for the Selective Catalytic Reduction of NO with NH3 at Low Temperatures, Applied Catalysis B: Environmental, vol. 16, May. 1998, pp.327-337.

DOI: 10.1016/s0926-3373(97)00089-1

[10] R.Q. Long, R.T. Yang, Selective Catalytic Oxidation of Ammonia to Nitrogen over Fe2O3-TiO2 Prepared with a Sol-Gel Method, Journal of Catalysis, vol. 207, Apr. 2002, pp.158-165.

DOI: 10.1006/jcat.2002.3545