Palladium supported on alumina catalysts prepared by MOCVD and impregnation methods

G. Garcia; J. R. Vargas; M. A. Valenzuela; M. Rebollar; D. Acosta

Palladium supported on alumina catalysts prepared by MOCVD and impregnation methods

G. Garcia, J. R. Vargas, M. A. Valenzuela, M. Rebollar, D. Acosta

Research output: Contribution to journal › Conference article › peer-review

Abstract

Conventional MOCVD method has been explored to prepare Pd supported catalysts. Pd and PdO phases were found on the surface of the support. Small Pd particles about 1 to 3 nm and dispersions up to 19% were obtained by MOCVD. TPR results indicated that several surface Pd compounds are reduced. At temperatures below 25 °C, PdO, the main compound, is completely converted to metallic Pd which forms hydrides. At higher temperatures, between 500 to 800 °C, the reduction peaks could be attributed to Pd-support interactions and a strong support dehydroxylation. All catalysts were inactive in benzene hydrogenation and a significant conversion was only detected a temperatures above 100 °C. This was explained by the reduced accessibility of Pd sites imposed by the carbon contamination and by the Pd-Al₂O₃ interactions.

Original language	English
Pages (from-to)	237-242
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	549
State	Published - 1999
Externally published	Yes
Event	Proceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' - Boston, MA, USA Duration: 30 Nov 1998 → 3 Dec 1998

Cite this

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title = "Palladium supported on alumina catalysts prepared by MOCVD and impregnation methods",

abstract = "Conventional MOCVD method has been explored to prepare Pd supported catalysts. Pd and PdO phases were found on the surface of the support. Small Pd particles about 1 to 3 nm and dispersions up to 19% were obtained by MOCVD. TPR results indicated that several surface Pd compounds are reduced. At temperatures below 25 °C, PdO, the main compound, is completely converted to metallic Pd which forms hydrides. At higher temperatures, between 500 to 800 °C, the reduction peaks could be attributed to Pd-support interactions and a strong support dehydroxylation. All catalysts were inactive in benzene hydrogenation and a significant conversion was only detected a temperatures above 100 °C. This was explained by the reduced accessibility of Pd sites imposed by the carbon contamination and by the Pd-Al2O3 interactions.",

author = "G. Garcia and Vargas, {J. R.} and Valenzuela, {M. A.} and M. Rebollar and D. Acosta",

year = "1999",

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volume = "549",

pages = "237--242",

journal = "Materials Research Society Symposium - Proceedings",

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note = "Proceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998' ; Conference date: 30-11-1998 Through 03-12-1998",

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TY - JOUR

T1 - Palladium supported on alumina catalysts prepared by MOCVD and impregnation methods

AU - Garcia, G.

AU - Vargas, J. R.

AU - Valenzuela, M. A.

AU - Rebollar, M.

AU - Acosta, D.

PY - 1999

Y1 - 1999

N2 - Conventional MOCVD method has been explored to prepare Pd supported catalysts. Pd and PdO phases were found on the surface of the support. Small Pd particles about 1 to 3 nm and dispersions up to 19% were obtained by MOCVD. TPR results indicated that several surface Pd compounds are reduced. At temperatures below 25 °C, PdO, the main compound, is completely converted to metallic Pd which forms hydrides. At higher temperatures, between 500 to 800 °C, the reduction peaks could be attributed to Pd-support interactions and a strong support dehydroxylation. All catalysts were inactive in benzene hydrogenation and a significant conversion was only detected a temperatures above 100 °C. This was explained by the reduced accessibility of Pd sites imposed by the carbon contamination and by the Pd-Al2O3 interactions.

AB - Conventional MOCVD method has been explored to prepare Pd supported catalysts. Pd and PdO phases were found on the surface of the support. Small Pd particles about 1 to 3 nm and dispersions up to 19% were obtained by MOCVD. TPR results indicated that several surface Pd compounds are reduced. At temperatures below 25 °C, PdO, the main compound, is completely converted to metallic Pd which forms hydrides. At higher temperatures, between 500 to 800 °C, the reduction peaks could be attributed to Pd-support interactions and a strong support dehydroxylation. All catalysts were inactive in benzene hydrogenation and a significant conversion was only detected a temperatures above 100 °C. This was explained by the reduced accessibility of Pd sites imposed by the carbon contamination and by the Pd-Al2O3 interactions.

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M3 - Artículo de la conferencia

AN - SCOPUS:0032661180

SN - 0272-9172

VL - 549

SP - 237

EP - 242

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

T2 - Proceedings of the 1998 MRS Fall Meeting - The Symposium 'Advanced Catalytic Materials-1998'

Y2 - 30 November 1998 through 3 December 1998

ER -

Palladium supported on alumina catalysts prepared by MOCVD and impregnation methods

Abstract

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