Use of zirconia, ceria–zirconia and ceria supports for Ag-based lean deNOx catalysts lowers the temperature range of activity by about 150–200K with respect to Al2O3-supported analogues. Ex situ characterisation of the catalysts indicates that this remarkable effect is associated with a role of the support rather than Ag dispersion. The crucial role of the support is further evidenced by suppression of CO formation over these catalysts and by significant support-related differences when SO2 is added tothe feed. The presence of ceria in the formulation results in an initial resistance to the deactivating effectof SO2; while the use of both zirconia and ceria–zirconia facilitates reactivation after sulphur poisoning.
Effect of the support on activity of silver catalysts for the selective reduction of NO by propene
HICKEY, JAMES NEIL;BOSCARATO, ILAN;KASPAR, JAN;
2010-01-01
Abstract
Use of zirconia, ceria–zirconia and ceria supports for Ag-based lean deNOx catalysts lowers the temperature range of activity by about 150–200K with respect to Al2O3-supported analogues. Ex situ characterisation of the catalysts indicates that this remarkable effect is associated with a role of the support rather than Ag dispersion. The crucial role of the support is further evidenced by suppression of CO formation over these catalysts and by significant support-related differences when SO2 is added tothe feed. The presence of ceria in the formulation results in an initial resistance to the deactivating effectof SO2; while the use of both zirconia and ceria–zirconia facilitates reactivation after sulphur poisoning.Pubblicazioni consigliate
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