CO adsorption on Pd(111) and Pd(100): Low and high pressure correlations

Autor:	W. Kevin Kuhn, D. Wayne Goodman, János Szanyi
Rok vydání:	1993
Předmět:	Absorption spectroscopy Chemistry Inorganic chemistry Infrared spectroscopy chemistry.chemical_element Surfaces and Interfaces Condensed Matter Physics Heterogeneous catalysis Surfaces Coatings and Films Catalysis Adsorption Transition metal Physical chemistry Single crystal Palladium
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 11:1969-1974
ISSN:	1520-8559 0734-2101
DOI:	10.1116/1.578532
Popis:	The adsorption of CO on Pd(111) and Pd(100) have been studied using infrared reflection–absorption spectroscopy over a wide range of CO pressures and temperatures. A strong dependence of CO adsorption on the initial conditions was found for Pd(111) while CO adsorption on Pd(100) was essentially independent of the conditions of adsorption. Initial isosteric heats of adsorption of 30 and 38 kcal/mol were determined for Pd(111) and Pd(100), respectively. For Pd(111) and equilibrium phase diagram was constructed on the basis of the infrared (IR) data. The excellent correspondence among IR data for the single crystal Pd surfaces and a supported Pd catalyst suggests that the Pd particles in the supported catalyst consist primarily of low index [(111) and (100)] crystal faces.
Databáze:	OpenAIRE
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