Particle size dependent CO dissociation on alumina-supported Rh: a model study

Frank, Martin M.; Andersson, S.; Libuda, Jörg; Stempel, Sascha; Sandell, A.; Brena, Barbara; Giertz, A.; Brühwiler, Paul A.; Bäumer, Marcus; Mårtensson, Nils; Freund, Hans‐Joachim

doi:10.1016/s0009-2614(97)01114-7

Cited by 81 publications

(71 citation statements)

References 26 publications

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“…15 All the islands studied in this work are expected to have threedimensional character. In the present paper the average number of atoms per island, as estimated through STM measurements, 20 will be used to denote the different deposits. The average cluster sizes studied in this work range from 140 to more than 100 000 atoms per island.…”

Section: Methodsmentioning

confidence: 99%

“…In this section we use core level photoemission spectra to demonstrate that the CO dissociation activity on the Rh particles is size dependent. This is done in a manner similar to that reported earlier, 20 but we focus on the changes undergone by the adsorbed CO. We will furthermore highlight some features in the spectra that will be of importance for the coming discussion. Figure 1 shows the evolution of the C 1s XPS peaks for the different rhodium deposits as a function of sample heating.…”

Section: A Size-dependent Dissociation Activity Upon Heatingmentioning

confidence: 99%

“…The results of these studies are presented in two steps: In Ref. 20 we discuss the structural properties of the system and establish that there is a pronounced maximum in the CO dissociation activity as a function of island size. In this paper we will proceed by elucidating important details of the dissociation process, in particular, the role played by heat-induced changes in the system observed at temperatures lower than the dissociation temperature.…”

Section: Introductionmentioning

confidence: 99%

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CO dissociation characteristics on size-distributed rhodium islands on alumina model substrates

Andersson

Frank

Sandell

et al. 1998

The Journal of Chemical Physics

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The dissociation of CO on size-distributed Rh particles supported on a thin alumina film has been studied with high resolution X-ray Photoelectron Spectroscopy ͑XPS͒ and X-ray Absorption Spectroscopy ͑XAS͒. Adsorbed CO dissociates upon heating to temperatures above 300 K. The dissociation activity is dependent on the island size, exhibiting a maximum for islands with around 1000 atoms. We have identified size-dependent changes in the C 1s photoelectron spectra for these CO-Rh systems occurring at temperatures lower than the onset of both the dissociation and desorption processes. These changes are interpreted as being due to adsorbed CO shifting into more highly coordinated sites. The dissociation activity is directly correlated to the availability of these sites, where the observed dissociation is proposed to occur. These results can be interpreted primarily in terms of the size and shape of the deposited Rh particles.

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Section: Methodsmentioning

confidence: 99%

Section: A Size-dependent Dissociation Activity Upon Heatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CO dissociation characteristics on size-distributed rhodium islands on alumina model substrates

Andersson

Frank

Sandell

et al. 1998

The Journal of Chemical Physics

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“…These results indicate that dissociative CO adsorption occurs on small Pt clusters even at room temperature. Figure 13 shows the CO dissociation probability as a function of particle size for Rh deposits on alumina films [155,156]. The size distributions have been characterized with STM [9,150].…”

Section: Alumina/nial(110)mentioning

confidence: 99%

“…Note that the behavior of the particles grown at 300 K (triangles) is not fully identical to the behavior of 90 K deposits (circles)[155,156]. Note that the behavior of the particles grown at 300 K (triangles) is not fully identical to the behavior of 90 K deposits (circles)[155,156].…”

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Ultrathin Oxide Films

Freund

Goodman

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Magnesium Oxide Mg O (100)/ Mo (100) Mg O (100)/ Ag (100) Mg O (111)/ Mo (110) Nickel Oxide Ni O (100)/ Ni (100), Mo (100) Ni O (111)/ Ni (111) Alumina Alumina/ Ni Al (110) Alumina/ Ni 3 Al (111) Al 2 O 3 (111)/ Ta (110) Al 2 O 3 (111)/ Mo (110) and Cu / Al 2 O 3 (111)/ Mo (110) Silica Si O 2 / Mo (110) Si O 2 / Mo (211) Cu / Si O 2 / Mo (110) Pd / Si O 2 / Mo (110) Au / Si O 2 / Mo (211) and Au / Ti O 2 / Si O 2 / Mo (211) Titania Ti x O y / Mo (100), Mo (110), Pt (111), Ni (110), W (100) Au / Ti O x / Mo (211) Chromia Cr 2 O 3 (111)/ Cr (11O) Vanadia Vanadium Sesquioxide Iron oxides Fe O / Pt (111), Fe 2 O 3 (0001)/ Pt (111), Fe 3 O 4 (001)/ Pt (111) Pd , Au on Iron Oxides Niobia Molybdenum Oxide Ceria Binary Oxides Ni O / Mg O , Ni O / Ca O , Mg O / Ni O , Ca O / Ni O / Mo (100) Conclusions Acknowledgments

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