The mechanism for NOx storage
Tóm tắt
The mechanisms for storing of NOx in platinum–barium–alumina catalysts during lean–rich transients are investigated. Oxidation of NO to NO2 is found to be an important step. NO2 is found to be important for oxidation of the catalyst or of nitrites to form nitrates. NOx is then stored in the form of surface nitrates. FTIR studies show no formation of bulk nitrates in these experiments.
Tài liệu tham khảo
J. Houghton, Global Warming, the Complete Briefing, 2nd Ed. (Cambridge Univ. Press, Cambridge, 1997).
V.I. Parvulescu, P. Grange and B. Delmon, Catal. Today 46 (1998) 233.
M. Shelef, Chem. Rev. 95 (1995) 209.
R. Burch and P.J. Millington, Catal. Today 26 (1995) 185.
Y. Ikeda, K. Sobue, S. Tsuji and S. Matsumoto, SAE paper 1999–01–1279 (1999).
P. Engström, A. Amberntsson, M. Skoglundh, E. Fridell and G. Smedler, Appl. Catal. B 22 (1999) L241.
A. Amberntsson, B. Westerberg, P. Engström, E. Fridell and M. Skoglundh, in: Catalyst Deactivation, eds. B. Delmon and G.F. Froment (Elsevier, Amsterdam, 1999) p. 317.
E. Fridell, M. Skoglundh, B. Westerberg, S. Johansson and G. Smedler, J. Catal. 183 (1999) 196.
M. Skoglundh, H. Johansson, L. Löwendahl, L. Jansson, L. Dahl and B. Hirschauer, Appl. Catal. B 7 (1996) 299.
L. Olsson, B. Westerberg, H. Persson, E. Fridell, M. Skoglundh and B. Andersson, J. Phys. Chem. B 103 (1999) 10433.
S.B. Xie, G. Mestl, M.P. Rosynek and J.H. Lunsford, J. Am. Chem. Soc. 119 (1997) 10186.
M. Skoglundh, H. Persson, N. Cruise and E. Fridell, J. Vac. Sci. Technol. B, submitted.
W.S. Kijlstra, D.S. Brands, E.K. Poels and A. Bliek, J. Catal. 171 (1997) 208.
A.L. Goodman, T.M. Miller and V.H. Grassian, J. Vac. Sci. Technol. A 16 (1998) 2585.
D.V. Pozdnyakov and V.N. Filmonov, Adv. Mol. Rel. Proc. 5 (1973) 55.
A.A. Davydov, Infrared Spectroscopy of Adsorbed Species on the Surface of Transition Metal Oxides (Wiley, New York, 1990).
B. Westerberg et al., to be published.
V. Labalme, N. Benhamou, N. Guilhaume, E. Garbowski and M. Primet, Appl. Catal. A 133 (1995) 351.