Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts
Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering an...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Seoane, X.L. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
1997 |
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| Schlagwörter: |
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| Systematik: |
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| Anmerkung: |
© Kluwer Academic Publishers 1997 |
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| Übergeordnetes Werk: |
Enthalten in: Catalysis letters - Kluwer Academic Publishers, 1988, 47(1997), 3-4 vom: Sept., Seite 213-220 |
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| Übergeordnetes Werk: |
volume:47 ; year:1997 ; number:3-4 ; month:09 ; pages:213-220 |
| Links: |
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| DOI / URN: |
10.1023/A:1019061122630 |
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| Katalog-ID: |
OLC2040140077 |
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| 245 | 1 | 0 | |a Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts |
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| 520 | |a Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. | ||
| 650 | 4 | |a Palladium | |
| 650 | 4 | |a Lanthanum | |
| 650 | 4 | |a Palladium Catalyst | |
| 650 | 4 | |a Palladium Particle | |
| 650 | 4 | |a Nitrate Precursor | |
| 700 | 1 | |a Fígoli, N.S. |4 aut | |
| 700 | 1 | |a L'Argentiere, P.C. |4 aut | |
| 700 | 1 | |a González, J.A. |4 aut | |
| 700 | 1 | |a Arcoya, A. |4 aut | |
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| 773 | 1 | 8 | |g volume:47 |g year:1997 |g number:3-4 |g month:09 |g pages:213-220 |
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10.1023/A:1019061122630 doi (DE-627)OLC2040140077 (DE-He213)A:1019061122630-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Seoane, X.L. verfasserin aut Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1997 Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. Palladium Lanthanum Palladium Catalyst Palladium Particle Nitrate Precursor Fígoli, N.S. aut L'Argentiere, P.C. aut González, J.A. aut Arcoya, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers, 1988 47(1997), 3-4 vom: Sept., Seite 213-220 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:47 year:1997 number:3-4 month:09 pages:213-220 https://doi.org/10.1023/A:1019061122630 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_95 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4314 VA 2890 AR 47 1997 3-4 09 213-220 |
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10.1023/A:1019061122630 doi (DE-627)OLC2040140077 (DE-He213)A:1019061122630-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Seoane, X.L. verfasserin aut Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1997 Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. Palladium Lanthanum Palladium Catalyst Palladium Particle Nitrate Precursor Fígoli, N.S. aut L'Argentiere, P.C. aut González, J.A. aut Arcoya, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers, 1988 47(1997), 3-4 vom: Sept., Seite 213-220 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:47 year:1997 number:3-4 month:09 pages:213-220 https://doi.org/10.1023/A:1019061122630 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_95 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4314 VA 2890 AR 47 1997 3-4 09 213-220 |
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10.1023/A:1019061122630 doi (DE-627)OLC2040140077 (DE-He213)A:1019061122630-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Seoane, X.L. verfasserin aut Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1997 Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. Palladium Lanthanum Palladium Catalyst Palladium Particle Nitrate Precursor Fígoli, N.S. aut L'Argentiere, P.C. aut González, J.A. aut Arcoya, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers, 1988 47(1997), 3-4 vom: Sept., Seite 213-220 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:47 year:1997 number:3-4 month:09 pages:213-220 https://doi.org/10.1023/A:1019061122630 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_95 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4314 VA 2890 AR 47 1997 3-4 09 213-220 |
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10.1023/A:1019061122630 doi (DE-627)OLC2040140077 (DE-He213)A:1019061122630-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Seoane, X.L. verfasserin aut Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1997 Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. Palladium Lanthanum Palladium Catalyst Palladium Particle Nitrate Precursor Fígoli, N.S. aut L'Argentiere, P.C. aut González, J.A. aut Arcoya, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers, 1988 47(1997), 3-4 vom: Sept., Seite 213-220 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:47 year:1997 number:3-4 month:09 pages:213-220 https://doi.org/10.1023/A:1019061122630 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_95 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4314 VA 2890 AR 47 1997 3-4 09 213-220 |
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10.1023/A:1019061122630 doi (DE-627)OLC2040140077 (DE-He213)A:1019061122630-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Seoane, X.L. verfasserin aut Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts 1997 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 1997 Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. Palladium Lanthanum Palladium Catalyst Palladium Particle Nitrate Precursor Fígoli, N.S. aut L'Argentiere, P.C. aut González, J.A. aut Arcoya, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers, 1988 47(1997), 3-4 vom: Sept., Seite 213-220 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:47 year:1997 number:3-4 month:09 pages:213-220 https://doi.org/10.1023/A:1019061122630 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_95 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 GBV_ILN_4314 VA 2890 AR 47 1997 3-4 09 213-220 |
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Seoane, X.L. @@aut@@ Fígoli, N.S. @@aut@@ L'Argentiere, P.C. @@aut@@ González, J.A. @@aut@@ Arcoya, A. @@aut@@ |
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Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. 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Seoane, X.L. |
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Seoane, X.L. ddc 540 rvk VA 2890 misc Palladium misc Lanthanum misc Palladium Catalyst misc Palladium Particle misc Nitrate Precursor Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts |
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540 660 VZ VA 2890 VZ rvk Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts Palladium Lanthanum Palladium Catalyst Palladium Particle Nitrate Precursor |
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Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts |
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Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts |
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Seoane, X.L. Fígoli, N.S. L'Argentiere, P.C. González, J.A. Arcoya, A. |
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palladium-lanthanum interaction phenomena in pd-$ lacl_{3} $/$ sio_{2} $ and pd-$ la_{2} $$ o_{3} $/$ sio_{2} $ catalysts |
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Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts |
| abstract |
Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. © Kluwer Academic Publishers 1997 |
| abstractGer |
Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. © Kluwer Academic Publishers 1997 |
| abstract_unstemmed |
Abstract The effect of La addition and the nature of the precursors on the surface properties of Pd/$ SiO_{2} $ are studied. Samples containing 0.5 wt% Pd were prepared by incipient wetness impregnation and characterized by $ H_{2} $ and CO chemisorption, TEM, TPR, EDX, XPS, $ Ar^{+} $-sputtering and CO/FTIR. The use of nitrate precursors improves both reducibility and dispersion of Pd. Lanthanum addition makes the metal reduction more difficult, indicating that a Pd-La interaction takes place. When starting from $ Cl^{-} $ precursors, $ Pd^{n+} $ species are formed at the surface, whereas only $ Pd^{0} $ is found when nitrate precursors are used. The addition of $ LaCl_{3} $ increases the Pd dispersion and hinders the formation of $ Pd^{n+} $ species through a dilution effect. In a sample prepared from Pd($ NO_{3} $)2+La($ NO_{3} $)3, the $ La_{2} $$ O_{3} $ formed upon calcination originates a SMSI-like effect on the palladium. This effect is suggested by the strong reduction of the $ H_{2} $ and CO chemisorption capacity of Pd in this sample, in spite of the fact that the dispersion of palladium calculated from TEM increases in the presence of La. From XPS results this SMSI state appears to be due to a physical decoration of Pd by $ La_{2} $$ O_{3} $ rather than to an electronic Pd-$ La_{2} $$ O_{3} $ interaction. The ``decoration model'' is further confirmed by the progressive increase of the Pd/La atomic ratio observed upon XPS/$ Ar^{+} $-sputtering at different times the sample containing La. The hypotheses of both dilution and decoration effects caused by $ LaCl_{3} $ and $ La_{2} $$ O_{3} $, respectively, are strengthened by the CO/FTIR results. © Kluwer Academic Publishers 1997 |
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Palladium-lanthanum interaction phenomena in Pd-$ LaCl_{3} $/$ SiO_{2} $ and Pd-$ La_{2} $$ O_{3} $/$ SiO_{2} $ catalysts |
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