Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction.
Bimetallic PtSn/γ -Al2O3–La2O3 catalysts were prepared by two comparative methods, successive impregnation (SI) and controlled surface reaction (CSR). FTIR-pyridine adsorption revealed a decrease in support acidity as a function of lanthanum content. Oxidized Pt2+ was identified by CO-FTIR chemisorp...
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| Formato: | Artículo |
| Lenguaje: | inglés |
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Universidad Autónoma Metropolitana-Iztapalapa
2003
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| Materias: | |
| Acceso en línea: | http://eprints.uanl.mx/13608/1/articulo%20catalisis.pdf |
| _version_ | 1824413743191162880 |
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| author | Del Angel Montes, Gloria Alicia Bonilla Barenca, Alfredo Peña Méndez, Yolanda Navarrete Barbosa, Juan Ignacio García Fierro, José Luis Acosta, D. R. |
| author_facet | Del Angel Montes, Gloria Alicia Bonilla Barenca, Alfredo Peña Méndez, Yolanda Navarrete Barbosa, Juan Ignacio García Fierro, José Luis Acosta, D. R. |
| author_sort | Del Angel Montes, Gloria Alicia |
| collection | Repositorio Institucional |
| description | Bimetallic PtSn/γ -Al2O3–La2O3 catalysts were prepared by two comparative methods, successive impregnation (SI) and controlled surface reaction (CSR). FTIR-pyridine adsorption revealed a decrease in support acidity as a function of lanthanum content. Oxidized Pt2+ was identified by CO-FTIR chemisorption and by XPS spectra on catalysts prepared by SI. When the CSR preparation method was used, reduced Pt0 was observed and oxidized Pt2+ was not detected. As the lanthanum content increased a diminution in cyclohexane dehydrogenation and n-heptane conversion was observed. Low hydrogenolysis and high selectivity to C7-olefins were obtained in both preparations. It is proposed that lanthanum in SI catalysts stabilizes the platinum in an oxidation state, Pt2+, and diminishes the support acidity. In CSR preparations the lanthanum effect is limited to inhibit the support acidity and hence to the bifunctional reactions occurring during the n-heptane conversion. |
| format | Article |
| id | eprints-13608 |
| institution | UANL |
| language | English |
| publishDate | 2003 |
| publisher | Universidad Autónoma Metropolitana-Iztapalapa |
| record_format | eprints |
| spelling | eprints-136082018-07-03T19:52:46Z http://eprints.uanl.mx/13608/ Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. Del Angel Montes, Gloria Alicia Bonilla Barenca, Alfredo Peña Méndez, Yolanda Navarrete Barbosa, Juan Ignacio García Fierro, José Luis Acosta, D. R. Biología y Química Bimetallic PtSn/γ -Al2O3–La2O3 catalysts were prepared by two comparative methods, successive impregnation (SI) and controlled surface reaction (CSR). FTIR-pyridine adsorption revealed a decrease in support acidity as a function of lanthanum content. Oxidized Pt2+ was identified by CO-FTIR chemisorption and by XPS spectra on catalysts prepared by SI. When the CSR preparation method was used, reduced Pt0 was observed and oxidized Pt2+ was not detected. As the lanthanum content increased a diminution in cyclohexane dehydrogenation and n-heptane conversion was observed. Low hydrogenolysis and high selectivity to C7-olefins were obtained in both preparations. It is proposed that lanthanum in SI catalysts stabilizes the platinum in an oxidation state, Pt2+, and diminishes the support acidity. In CSR preparations the lanthanum effect is limited to inhibit the support acidity and hence to the bifunctional reactions occurring during the n-heptane conversion. Universidad Autónoma Metropolitana-Iztapalapa 2003-10-01 Article PeerReviewed text en cc_by_nc_nd http://eprints.uanl.mx/13608/1/articulo%20catalisis.pdf http://eprints.uanl.mx/13608/1.haspreviewThumbnailVersion/articulo%20catalisis.pdf Del Angel Montes, Gloria Alicia y Bonilla Barenca, Alfredo y Peña Méndez, Yolanda y Navarrete Barbosa, Juan Ignacio y García Fierro, José Luis y Acosta, D. R. (2003) Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. Journal of Catalysis, 219. pp. 63-73. ISSN 0021-9517 doi:10.1016/S0021-9517(03)00140-4 |
| spellingShingle | Biología y Química Del Angel Montes, Gloria Alicia Bonilla Barenca, Alfredo Peña Méndez, Yolanda Navarrete Barbosa, Juan Ignacio García Fierro, José Luis Acosta, D. R. Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. |
| thumbnail | https://rediab.uanl.mx/themes/sandal5/images/online.png |
| title | Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. |
| title_full | Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. |
| title_fullStr | Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. |
| title_full_unstemmed | Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. |
| title_short | Effect of lanthanum on the catalytic properties of PtSn/γ-Al2O3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction. |
| title_sort | effect of lanthanum on the catalytic properties of ptsn γ al2o3 bimetallic catalysts prepared by successive impregnation and controlled surface reaction |
| topic | Biología y Química |
| url | http://eprints.uanl.mx/13608/1/articulo%20catalisis.pdf |
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