Studies of the Ensemble Size Requirements for Ethylene Adsorption and Decomposition on pt(111): Ethylene and Bismuth Coadsorption

R. G. Windham; B. E. Koel; M. T. Paffett

doi:https://doi.org/10.1021/la00083a009

Studies of the Ensemble Size Requirements for Ethylene Adsorption and Decomposition on pt(111): Ethylene and Bismuth Coadsorption

R. G. Windham, B. E. Koel, M. T. Paffett

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

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Abstract

The coadsorption of bismuth and ethylene on Pt(111) has been studied by using AES, LEED, TPD, and HREELS. These studies were carried out to determine if bismuth acts as an inert, site-blocking agent that can be used to determine ensemble size requirements of ethylene adsorption and decomposition on Pt(111). These studies show that, indeed, bismuth has no effect on the heat of adsorption of molecular ethylene, the decomposition mechanism, or the activation energy required for C-H bond breaking or subsequent elementary decomposition reactions. The vibrational frequencies of adsorbed ethylene are also independent of bismuth coverage. Preliminary modeling of the decreased adsorption and reaction of ethylene due to coadsorbed bismuth determines that an ensemble of four Pt atoms is required for adsorption and a slightly larger ensemble (possibly five of six Pt atoms) is required for decomposition.

Original language	English (US)
Pages (from-to)	1113-1118
Number of pages	6
Journal	Langmuir
Volume	4
Issue number	5
DOIs	https://doi.org/10.1021/la00083a009
State	Published - Sep 1 1988
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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title = "Studies of the Ensemble Size Requirements for Ethylene Adsorption and Decomposition on pt(111): Ethylene and Bismuth Coadsorption",

abstract = "The coadsorption of bismuth and ethylene on Pt(111) has been studied by using AES, LEED, TPD, and HREELS. These studies were carried out to determine if bismuth acts as an inert, site-blocking agent that can be used to determine ensemble size requirements of ethylene adsorption and decomposition on Pt(111). These studies show that, indeed, bismuth has no effect on the heat of adsorption of molecular ethylene, the decomposition mechanism, or the activation energy required for C-H bond breaking or subsequent elementary decomposition reactions. The vibrational frequencies of adsorbed ethylene are also independent of bismuth coverage. Preliminary modeling of the decreased adsorption and reaction of ethylene due to coadsorbed bismuth determines that an ensemble of four Pt atoms is required for adsorption and a slightly larger ensemble (possibly five of six Pt atoms) is required for decomposition.",

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Studies of the Ensemble Size Requirements for Ethylene Adsorption and Decomposition on pt(111): Ethylene and Bismuth Coadsorption

Abstract

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