Abstract
A series of catalysts of manganese oxide, manganese–cerium and iron–manganese oxide supported on USY (ultra-stable Y zeolite) were studied for the low-temperature selective catalytic reduction (SCR) of NO with ammonia in the presence of excess oxygen. It was found that MnOx/USY have high activity and high selectivity to N2 in the temperature range 80-180 °C. The addition of iron and cerium oxide increased NO conversion significantly although the single-component Fe/USY and Ce/USY catalysts had low activities. Among the catalysts studied in this work, the 14% Ce-6% Mn/USY showed the highest activity. The results showed that this catalyst yielded nearly 100% NO conversion at 180 °C at a space velocity of 30 000 cm3 g-1 h-1. The only product is N2 (with no N2O) below 150 °C. The effects of the concentration of oxygen, NO and NH3 were studied and the steady-state kinetics were also investigated. The reaction order is 1 with respect to NO and zero with respect to NH3 on the 14% Ce-6% Mn/USY catalyst at 150 °C.
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References
H. Bosch and F. Janssen, Catal. Today 2 (1988) 369.
H. Schneider, U. Scharf, A. Wokaun and A. Baiker, J. Catal. 147 (1994) 545.
K. C. Taylor, Catal. Rev. Sci. Eng. 35 (1993) 457.
G. Busca, L. Lietti, G. Ramis and F. Berti, Appl. Catal. B18 (1998) 1.
G. Centi and S. Perathoner, Appl. Catal. A132 (1995) 179.
M. Iwamoto and H. Yahiro, Catal. Today 22 (1994) 5.
J. N. Armor, Catal. Today 26 (1995) 147.
M. Shelef, Chem. Rev. 95 (1995) 209.
Z. J. Li and M. Flytzani-Stephanopoulos, J. Catal. 182 (1999) 313.
G. L. Bauerle, S. C. Wu and K. Nobe, Ind. Eng. Chem. Prod. Res. Dev. 17 (1978) 123.
W. C. Wong and K. Nobe, Ind. Eng. Chem. Prod. Res. Dev. 25 (1986) 179.
F. Janssen, F. Kerkhof, H. Bosh and J. R. H. Ross, J. Phys. Chem. 91 (1987) 5921.
J. W. Byrne, J. M. Chen and B. K. Speronello, Catal. Today 13 (1992) 33.
G. Ramis, G. Busca and F. Bregani, Catal. Lett. 139 (1993) 353.
J. P. Chen and R. T. Yang, Appl. Catal. A80 (1992) 135.
G. Busca, L. Lietti, G. Ramis and F. Berti, Appl. Catal. B18 (1988) 1.
G. L. Bauerle, S. C. Wu and K. Nobe, Ind. Eng. Chem. Prod. Res. Dev. 14 (1975) 268.
J. P. Chen, R. T. Yang, M. A. Buzanowski and J. E. Cichanowicz, Ind. Eng. Chem. Res. 29 (1990) 1431.
L. Singoredjo, R. Korver, F. Kapteijn and J. Moulijn, Appl. Catal. B1 (1992) 297.
Z. P. Zhu, Z. Y. Liu, H. X. Niu and S. J. Liu, J. Catal. 187 (1999) 245.
P. Fabrizioli, T. Burgi and A. Baiker, J. Catal. 206 (2002) 143.
M. Richter, A. Trunschke, U. Bentrup, K.-W. Brzezinka, E. Schreier, M. Schneider, M.-M. Pohland R. Fricke, J. Catal. 206 (2002) 98.
F. Notoya, C. Su, E. Sasako and S. Nojima, Ind. Eng. Chem. Res. 40 (2000) 3732.
R. Q. Long, R. T. Yang and R. Chang, Chem. Commun. 5 (2002) 452.
F. Kapteijn, L. Singoredjo, N. J. Dekker and J. A. Moulijn, Ind. Eng. Chem. Res. 32 (1993) 445.
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Qi, G., Yang, R.T. & Chang, R. Low-Temperature SCR of NO with NH3 over USY-Supported Manganese Oxide-Based Catalysts. Catalysis Letters 87, 67–71 (2003). https://doi.org/10.1023/A:1022809328087
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DOI: https://doi.org/10.1023/A:1022809328087