Abstract
A kinetic analysis in a variety of conditions (gas composition and temperature) has been conducted on catalysts of iron oxides supported on activated carbon fiber composites (ACFC). Additionally, experiments of temperature-programmed desorption (TPD) of NO were conducted on the catalysts in order to reveal mechanistic features of the low-temperature SCR reaction. In the light of current SCR literature and previous work, a qualitative picture of the catalytic behavior of low-temperature SCR catalysts is offered. Apparently, the strength of adsorption of NO during the low-temperature SCR reaction is responsible for the governing reaction mechanism. Thus, highly stable nitrates formed on the surface provoke catalyst deactivation and reaction through an ER mechanism, with NO reacting from the gas phase, whereas the absence of these nitrates permits reaction of less stable nitrites from the catalyst surface, following an LH-type mechanism. This is the case for the ACFC-supported iron oxide catalyst analyzed in this work.
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References
F. Kapteijn, L. Singoredjo, N.J.J. Dekker and J.A. Moulijn, Ind. Eng. Chem. Res. 32 (1993) 445-452.
W.S. Kijlstra, D.S. Brands, E.K. Poels and A. Bliek, Catal. Today 50 (1999) 133-140.
W.S. Kijlstra, D.S. Brands, H.I. Smit, E.K. Poels and A. Bliek, J. Catal. 171 (1997) 219-230.
W.S. Kijlstra, D.S. Brands, E.K. Poels and A. Bliek, J. Catal. 171 (1997) 208-218.
G. Ramis, G. Busca, F. Bregani and P. Forzatti, Appl. Catal. 64 (1990) 243-259.
L. Singoredjo, PhD Thesis, University of Amsterdam, 1992.
F. Kapteijn, L. Singoredjo, M. van Driel, A. Andreïni, J.A. Moulijn, G. Ramis and G. Busca, J. Catal. 150 (1994) 105-116.
G. Centi and S. Perathoner, J. Catal. 152 (1995) 93-102.
G. Marbán and A.B. Fuertes, Appl. Catal. B: Environ. 34(1) (2001) 55-71.
G. Marbán, R. Antuña and A.B. Fuertes, Low-temperature SCR of NO x with NH 3 over Activated Carbon Fiber Composite-supported Metal Oxides, Appl. Catal. B: Environ. submitted.
G. Marbán, A.B. Fuertes and D.M. Nevskaia, Carbon 38 (2000) 2167-2170.
R.B. Bird, W.E. Stewart and E.N. Lightfoot, Transport Phenomena, sec. 17–28 (John Wiley & Sons, NY, 1982).
J.A. Moulijn, A. Tarfaoui and F. Kapteijn, Catalysis Today 11 (1991) 1-12.
O. Levenspiel, The Chemical Reactor Omnibook, Chaps. 22–23 (OSU Book Stores, Oregon, USA, 1996).
L.K. Doraiswamy and M.M. Sharma, Heterogeneous reactions: Analysis, examples and reactor design. Vol. I: Gas-solid and solid-solid reactions, Chap. 3 (John Wiley & Sons, NY, 1984).
R.B. Bird, W.E. Stewart and E.N. Lightfoot, Transport Phenomena, sec. 1–23, 21–48 (John Wiley & Sons, NY, 1982).
L.K. Doraiswamy and M.M. Sharma, Heterogeneous reactions: Analysis, examples and reactor design. Vol. I: Gas-solid and solid-solid reactions, Chap. 6 (John Wiley & Sons, NY, 1984).
M.J.G. Alonso, D. Álvarez, A.G. Borrego, R. Menéndez and G. Marbán, Energy & Fuels 15 (2001) 413-428.
G. Marbán and A. Cuesta, Energy & Fuels 15 (2001) 764-766.
G. Busca, L. Lietti, G. Ramis and F. Berti, Appl. Catal. B: Environ. 18 (1998) 1-36.
J. Marangozis, Ind. Eng. Chem. Res. 31 (1992) 987-994.
G. de la Puente, G. Marbán, E. Fuente and J.J. Pis, J. Anal. Appl. Pyrol. 44 (1998) 205-218.
G. Marbán and A.B. Fuertes, Appl. Catal. B: Environ. 34(1) (2001) 43-53.
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Marbán, G., Fuertes, A.B. Kinetics of the Low-Temperature Selective Catalytic Reduction of NO with NH3 Over Activated Carbon Fiber Composite-Supported Iron Oxides. Catalysis Letters 84, 13–19 (2002). https://doi.org/10.1023/A:1021008113948
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DOI: https://doi.org/10.1023/A:1021008113948