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  Preparation of Pd–MgO model catalysts by deposition of Pd from aqueous precursor solutions onto Ag(0 0 1)-supported MgO(0 0 1) thin films

Ringleb, F., Sterrer, M., & Freund, H.-J. (2014). Preparation of Pd–MgO model catalysts by deposition of Pd from aqueous precursor solutions onto Ag(0 0 1)-supported MgO(0 0 1) thin films. B. Delmon Honor Special Issue. doi:10.1016/j.apcata.2013.05.031.

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 Creators:
Ringleb, Franziska1, Author              
Sterrer, Martin1, Author              
Freund, Hans-Joachim1, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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Free keywords: Catalyst preparation; Model catalyst; Surface science; Palladium; Magnesium oxide; Spectroscopy; CO oxidation
 Abstract: The preparation of Pd–MgO model catalysts via liquid-phase deposition of Pd from aqueous Pd precursor solutions was studied. Thin, single-crystalline MgO(0 0 1) films grown on a Ag(0 0 1) substrate were used as support and allowed surface science techniques such as Auger electron spectroscopy, X-ray photoelectron spectroscopy, scanning tunneling microscopy, and temperature programmed desorption to be applied for characterization. Thin MgO(0 0 1) films were unstable and rapidly dissolved in acidic and neutral environments, but remained stable in thickness in alkaline solutions after an initial dissolution of a few layers of MgO. Pd was deposited by exposure of the thin film MgO substrate to alkaline (pH 12) precursor solutions containing Pd-hydroxide complexes. Scanning tunneling microscopy images taken from ultrathin MgO films revealed the formation of Pd particles 3 nm in diameter after thermal decomposition of the precursor at 600 K, as well as roughening of the MgO substrate, including the formation of etch pits, which leads to partial exposure of the Ag substrate. For Pd deposited on thick MgO films, the formation of Pd nanoparticles by thermal decomposition of the adsorbed Pd-hydroxide precursor was followed by X-ray photoelectron spectroscopy. Pd–MgO model catalysts with similar Pd coverage prepared either by liquid-phase deposition or physical vapor deposition in UHV exhibited similar properties, as revealed by their comparable behavior in CO adsorption and CO oxidation.

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Language(s): eng - English
 Dates: 2013-05-222013-04-032013-05-242013-06-022014-03-22
 Publication Status: Published in print
 Pages: 8
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.apcata.2013.05.031
 Degree: -

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Project name : STRUBOLI - Structure and Bonding at Oxide-Liquid Interfaces
Grant ID : 280070
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: B. Delmon Honor Special Issue
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Title: Applied Catalysis A: General
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 474 Sequence Number: - Start / End Page: 186 - 193 Identifier: ISSN: 0926-860X
CoNE: https://pure.mpg.de/cone/journals/resource/954925567761_1