INVESTIGADORES
QUERINI Carlos Alberto
artículos
Título:
Abatement of diesel exhaust pollutants: NOx adsorption on Co, Ba,K/CeO2 catalysts
Autor/es:
MILT, V.G.; QUERINI, C.A.; MIRO, EE; ULLA, M.A.
Revista:
JOURNAL OF CATALYSIS
Editorial:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Referencias:
Año: 2003 vol. 220 p. 424 - 432
ISSN:
0021-9517
Resumen:
The Co,Ba,K/CeO2 system is a potential candidate to be used under the simultaneous abatement of soot and NOx in diesel exhausts. In this
work, we study the interactions of NOx with the said solid. NO2 is strongly adsorbed on the Ba,K/CeO2 surface through the formation of Ba
and K nitrate species which are stable under He atmosphere up to 490 ◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2
and K nitrate species which are stable under He atmosphere up to 490 ◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2
work, we study the interactions of NOx with the said solid. NO2 is strongly adsorbed on the Ba,K/CeO2 surface through the formation of Ba
and K nitrate species which are stable under He atmosphere up to 490 ◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2
and K nitrate species which are stable under He atmosphere up to 490 ◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2
2 system is a potential candidate to be used under the simultaneous abatement of soot and NOx in diesel exhausts. In this
work, we study the interactions of NOx with the said solid. NO2 is strongly adsorbed on the Ba,K/CeO2 surface through the formation of Ba
and K nitrate species which are stable under He atmosphere up to 490 ◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2
and K nitrate species which are stable under He atmosphere up to 490 ◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2
x with the said solid. NO2 is strongly adsorbed on the Ba,K/CeO2 surface through the formation of Ba
and K nitrate species which are stable under He atmosphere up to 490 ◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2◦C. However, when Co is incorporated to the system (Co,Ba,K/CeO2
catalyst), Ba nitrates become unstable at ca. 370 ◦C, under both NO+O2 and He atmosphere. DRX, FTIR, and LRS characterization shows
that potassium favors the formation of the BaCoO2.93 perovskite in the Co,Ba,K/CeO2 catalyst calcined at 400 ◦C. This perovskite structure is
not detected when K is absent (Co,Ba/CeO2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
not detected when K is absent (Co,Ba/CeO2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
that potassium favors the formation of the BaCoO2.93 perovskite in the Co,Ba,K/CeO2 catalyst calcined at 400 ◦C. This perovskite structure is
not detected when K is absent (Co,Ba/CeO2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
not detected when K is absent (Co,Ba/CeO2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
◦C, under both NO+O2 and He atmosphere. DRX, FTIR, and LRS characterization shows
that potassium favors the formation of the BaCoO2.93 perovskite in the Co,Ba,K/CeO2 catalyst calcined at 400 ◦C. This perovskite structure is
not detected when K is absent (Co,Ba/CeO2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
not detected when K is absent (Co,Ba/CeO2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
2.93 perovskite in the Co,Ba,K/CeO2 catalyst calcined at 400 ◦C. This perovskite structure is
not detected when K is absent (Co,Ba/CeO2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
2 system). FTIR spectra of Co,Ba,K/CeO2 treated with NO+O2 indicate the formation of surface
N-bound nitrate species (O?Ba- -NO2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
2), where NO2 acts as a Lewis base. Since the said species are not detected in the samples without
BaCoO2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N2
2.93, it is suggested that they are related to the Ba atoms of the perovskite structure. Microbalance experiments combined with FTIR
and mass spectroscopy characterization show that the nitrate species formed in the Co,Ba,K/CeO2 sample can be readily decomposed to N22 sample can be readily decomposed to N2
under a reducing atmosphere, making this system very interesting to be used as a NOx catalytic trap. On the other hand, under He atmosphere
the decomposition of nitrates only produces gaseous NOx . In addition, when the Co,Ba,K/CeO2 catalyst previously treated under NO + O2
the decomposition of nitrates only produces gaseous NOx . In addition, when the Co,Ba,K/CeO2 catalyst previously treated under NO + O2
x catalytic trap. On the other hand, under He atmosphere
the decomposition of nitrates only produces gaseous NOx . In addition, when the Co,Ba,K/CeO2 catalyst previously treated under NO + O2x . In addition, when the Co,Ba,K/CeO2 catalyst previously treated under NO + O2
atmosphere is intimately mixed with the soot and then heated in He up to 490 ◦C, the soot particulates are partially oxidized by the surface
nitrate species
nitrate species
◦C, the soot particulates are partially oxidized by the surface
nitrate species