Factors influencing hydride formation in a Pd/TiO2 catalyst

Jacinto Sá; Geomar D. Arteaga; Robert A. Daley; Johannes Bernardi; James A. Anderson

doi:10.1021/jp062205l

Factors influencing hydride formation in a Pd/TiO₂ catalyst

Jacinto Sá, Geomar D. Arteaga, Robert A. Daley, Johannes Bernardi, James A. Anderson^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

A sample containing Pd nanoparticles deposited on TiO₂ was subjected to a series of different thermal pretreatments. The range of these treatments was selected to provide a palladium surface in a number of different states, including a form where TiO_x overlayers had been formed. Experiments were conducted to determine how the state of the Pd surface influenced the formation of Pd hydride. The amount of hydrogen released during a temperature-programmed experiment was used to quantify the extent of Pd β-hydride formation following room-temperature exposure to hydrogen. Samples were characterized by HAADF (high-angle annular dark-field) electron microscopy with EDX (energy-dispersive X-ray) analysis and CO pulse chemisorption and FTIR (Fourier transform infrared spectroscopy) of adsorbed CO. The amount and the ease with which Pd β-hydride was formed was found to be dependent on the metal surface area, the presence of titania overlayers, and the Pd surface roughness/defect concentration.

Original language	English
Pages (from-to)	17090-17095
Number of pages	6
Journal	Journal of Physical Chemistry B
Volume	110
Issue number	34
DOIs	https://doi.org/10.1021/jp062205l
Publication status	Published - 1 Aug 2006

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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abstract = "A sample containing Pd nanoparticles deposited on TiO2 was subjected to a series of different thermal pretreatments. The range of these treatments was selected to provide a palladium surface in a number of different states, including a form where TiOx overlayers had been formed. Experiments were conducted to determine how the state of the Pd surface influenced the formation of Pd hydride. The amount of hydrogen released during a temperature-programmed experiment was used to quantify the extent of Pd β-hydride formation following room-temperature exposure to hydrogen. Samples were characterized by HAADF (high-angle annular dark-field) electron microscopy with EDX (energy-dispersive X-ray) analysis and CO pulse chemisorption and FTIR (Fourier transform infrared spectroscopy) of adsorbed CO. The amount and the ease with which Pd β-hydride was formed was found to be dependent on the metal surface area, the presence of titania overlayers, and the Pd surface roughness/defect concentration.",

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AU - Sá, Jacinto

AU - Arteaga, Geomar D.

AU - Daley, Robert A.

AU - Bernardi, Johannes

AU - Anderson, James A.

PY - 2006/8/1

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Factors influencing hydride formation in a Pd/TiO₂ catalyst

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