Abstract
Extensive homogeneous gas‐phase reactions were observed when decane was used as the hydrocarbon reductant for the selective reduction of NO x . The catalytic performance of a SnO2/CoO x /Al2O3 catalyst was found to be strongly dependent on the extent of the homogeneous reaction in the pre‐catalytic volume. The effect of the homogeneous reaction on the catalytic performance also depended on whether SO2 was present in the feed. By filling the pre‐catalytic volume with 25–35 mesh irregularly shaped quartz chips, gas‐phase reaction was suppressed significantly. This methodology was used to evaluate the inherent catalytic performance of SnO2/CoO x /Al2O3 and SnO2/Al2O3 catalysts with decane as a reductant. It was found that in the absence of SO2, SnO2/Al2O3 was a better catalyst than SnO2/CoO x /Al2O3, but in the presence of 30 ppm of SO2 the latter was a far better catalyst.
Similar content being viewed by others
References
F.O. Rice, J. Am. Chem. Soc. 53 (1931) 1959.
J.H. Knox and A.F. Trotman-Dickenson, Trans. Faraday Soc. I 54 (1970) 161.
J.H. Knox, Adv. Chem. Ser. 76 (1968) 10.
H.H. Kung, Adv. Catal. 40 (1994) 1.
F. Witzel, G.A. Sill and W.K. Hall, J. Catal. 149 (1994) 229.
M. Sasaki, H. Hamada, Y. Kintaichi and T. Ito, Catal. Lett. 15 (1992) 297.
D.B. Lukyanov, G. Sill, J.L. d'Itri and W.K. Hall, J. Catal. 153 (1995) 265.
K.C.C. Kharas, M.J. Miller and J.-Y. Yan, SAE paper #982604 (1998).
H. Hamada, Y. Kintaichi, M. Sasaki and I. Takehiko, Appl. Catal. 70 (1991) L15.
K.T. Nguyen and H.H. Kung, J. Catal. 122 (1990) 415.
R. Martin, M. Dzierzynski and M. Niclause, J. Chem. Phys. 61 (1964) 790.
K. Maeda, F. Mizukaini, S.I. Newa, M. Toba, M. Watanake and K. Masuda, J. Chem. Soc. Faraday Trans. 88 (1992) 97.
K.S. Chung and F.E. Massoth, J. Catal. 64 (1980) 332.
R.D. Wilk, R.S. Cohen and N.P. Cemansky, Ind. Eng. Chem. Res. 34 (1995) 2285.
A.D. Walsh, in: 9th Symp. (International) on Combustion, Pittsburgh, 1962, p. 1046.
A. Fish, Quart. Rev. Chem. Soc. (London) 18 (1964) 243.
Y. Zheng and M.C. Kung, unpublished result.
M.C. Kung, P.W. Park, D.W. Kim and H.H. Kung, J. Catal. 181 (1999) 1.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Cheung, C., Kung, M. Influence of homogeneous decane oxidation on the catalytic performance of lean NO x catalysts. Catalysis Letters 61, 131–138 (1999). https://doi.org/10.1023/A:1019033224467
Issue Date:
DOI: https://doi.org/10.1023/A:1019033224467