Kinetics, acid sites and deactivation of H-mordenite during the SCR of NOx with CH4 |
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Authors: | A Ribotta M Lezcano M Kurgansky E Miroè E Lombardo J Petunchi C Moreaux JM Dereppe |
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Abstract: | H-mordenites are active for the SCR reaction but they suffer irreversible partial deactivation after being on stream for one
hour at 650°C. The reaction orders and activation energies are not significantly affected by deactivation. This indicates
that deactivation originates in a decrease in the number of active sites due to dealumination and possible pore blockage.
The NO disappearance rate correlates with TPD NH3 between 300 and 700°C; FTIR confirms these results. 129Xe NMR of adsorbed xenon shows that pore blockage occurs and is due to the presence of aluminum species in the main zeolite
channels. The overall deactivation process and the role of acid sites is discussed in terms of the current literature.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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