Copper loaded hydroxyapatite catalysts have been prepared in organic medium by reaction/evaporati... more Copper loaded hydroxyapatite catalysts have been prepared in organic medium by reaction/evaporation and impregnation methods and have been tested in the selective catalytic reduction of NO by NH3. The catalyst characterizations showed the presence of CuO and Cu2O particles deposited on the surface of the carrier in different environments and sizes. Compared to the catalysts prepared by ion exchange and impregnation in aqueous medium method, the ones prepared in organic medium are less efficient in the selective catalytic reduction of NO by NH3.
The influence of the increase of the specific surface area of the support Ca-HAp on the dispersio... more The influence of the increase of the specific surface area of the support Ca-HAp on the dispersion of copper species and their activity in the NO-SCR by NH3 has been studied. The copper ion exchange does not alter the Ca-HAp structure whatever the copper concentration. The increase of the specific surface area of the support changed the dispersion and the reducibility of copper species. The high NO conversion in the whole temperature range for the catalyst with the lowest specific surface area (35 m2/g) was related to the highly dispersed CuO particles that are easily reduced. Nevertheless, the increase of the specific surface area of the support (76 m2/g), induces an increase of the size of CuO particles that become less active in NO-SCR by NH3. The addition of 2.5 % of H2O to the reaction gas feed strongly affects the NO conversion in the whole temperature range. This deactivation can be related to the change of the nature of copper species rather than to the destruction of the Ca...
The influence of addition of rare earth cations ( La, Ce, Sm) upon the redox and adsorptive prope... more The influence of addition of rare earth cations ( La, Ce, Sm) upon the redox and adsorptive properties of Cu-M-ZSM-5 catalysts prepared via solid ion exchange has been studied. The activity in the selective catalytic reduction of NO by n-C10H22 in oxidizing atmosphere of the prepared catalysts has also been evaluated. Among the catalysts prepared, Cu-Sm-ZSM5 exhibits the highest de-NOx efficiency.
Copper loaded hydroxyapatite catalysts have been prepared in organic medium by reaction/evaporati... more Copper loaded hydroxyapatite catalysts have been prepared in organic medium by reaction/evaporation and impregnation methods and have been tested in the selective catalytic reduction of NO by NH3. The catalyst characterizations showed the presence of CuO and Cu2O particles deposited on the surface of the carrier in different environments and sizes. Compared to the catalysts prepared by ion exchange and impregnation in aqueous medium method, the ones prepared in organic medium are less efficient in the selective catalytic reduction of NO by NH3.
The influence of the increase of the specific surface area of the support Ca-HAp on the dispersio... more The influence of the increase of the specific surface area of the support Ca-HAp on the dispersion of copper species and their activity in the NO-SCR by NH3 has been studied. The copper ion exchange does not alter the Ca-HAp structure whatever the copper concentration. The increase of the specific surface area of the support changed the dispersion and the reducibility of copper species. The high NO conversion in the whole temperature range for the catalyst with the lowest specific surface area (35 m2/g) was related to the highly dispersed CuO particles that are easily reduced. Nevertheless, the increase of the specific surface area of the support (76 m2/g), induces an increase of the size of CuO particles that become less active in NO-SCR by NH3. The addition of 2.5 % of H2O to the reaction gas feed strongly affects the NO conversion in the whole temperature range. This deactivation can be related to the change of the nature of copper species rather than to the destruction of the Ca...
The influence of addition of rare earth cations ( La, Ce, Sm) upon the redox and adsorptive prope... more The influence of addition of rare earth cations ( La, Ce, Sm) upon the redox and adsorptive properties of Cu-M-ZSM-5 catalysts prepared via solid ion exchange has been studied. The activity in the selective catalytic reduction of NO by n-C10H22 in oxidizing atmosphere of the prepared catalysts has also been evaluated. Among the catalysts prepared, Cu-Sm-ZSM5 exhibits the highest de-NOx efficiency.
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