Electron paramagnetic resonance studies of a platinum cluster in Linde L and faujasite zeolites

Schmauke, Thorsten; Eichel, Rüdiger‐A.; Schweiger, Arthur; Roduner, Emil

doi:10.1039/b303407k

Cited by 19 publications

(42 citation statements)

References 52 publications

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“…than that of the deuteron and thus the hyperfine splitting of H is 6.5 times larger than that for D. 13,14 The observation implies that the deuteron and proton hyperfine couplings are unresolved but affect the line width, although no strong line width dependence on hydrogen coverage is observed (see below).…”

Section: Resultsmentioning

confidence: 85%

“…16 Simulations of the spectra in Figure 4 verify that the multiplet is due to a well-defined magic number Pt 13 cluster and to a significant decrease of the g anisotropy (see below). Furthermore, exchange of deuterium for hydrogen leads to slightly narrower lines of the multiplet, resulting in a better resolution.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, isotopically enriched Pt samples proved unambiguously that the splitting is due to Pt. 13 The g value is much…”

Section: Resultsmentioning

confidence: 99%

“…13 High field conditions were assumed so that the effects of the nuclear field on the alignment of the electron spin are negligible, and the electron problem can be treated independently of the nuclei. Treating each nucleus independently allows for more flexibility with near equivalent nuclei.…”

Section: Sample Preparation Kl Zeolite Was Obtained From Chemie Uetimentioning

confidence: 99%

“…For the EPR spectral simulation of the Pt cluster, all possible Pt isotope distributions weighted with the corresponding statistical probabilities were taken into account. 13 Coaxial hyperfine and g tensors were assumed for the simulation.…”

Section: Sample Preparation Kl Zeolite Was Obtained From Chemie Uetimentioning

confidence: 99%

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Support Effects on Hydrogen Desorption, Isotope Exchange, Chemical Reactivity, and Magnetism of Platinum Nanoclusters in KL Zeolite

et al. 2013

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Platinum clusters were prepared by ion exchange of a KL zeolite, followed by oxygen calcination and hydrogen reduction, and characterized by electron paramagnetic resonance (EPR) and hyperfine sublevel correlation experiment (HYSCORE) spectroscopy. Simulations indicate that the cluster contains 12 equivalent platinum atoms. Therefore, the most likely structure is an icosahedral or cuboctahedral magic number Pt 13 cluster with 12 platinum atoms at the surface.One atom in the center possesses only a small spin density. H/D desorption and readsorption experiments monitored via EPR and HYSCORE measurements provide information about the structure of the clusters and about the reversibility of the adsorption/desorption and isotope exchange process. Deuterium desorption experiments result in a value of 2.1±0.2 eV for the D 2 desorption energy of the Pt 13 clusters dispersed in KL zeolite. This is more than double of the 2 value for a (111) Pt single-crystal surface, revealing a finite size and/or support effect. Oxygen adsorption on deuterium covered Pt 13 clusters did not show a vigorous oxyhydrogen reaction. It appears that the reaction is inhibited by the deuterium coverage.

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Section: Resultsmentioning

confidence: 85%

Section: Resultsmentioning

confidence: 99%

“…Furthermore, isotopically enriched Pt samples proved unambiguously that the splitting is due to Pt. 13 The g value is much…”

Section: Resultsmentioning

confidence: 99%

Section: Sample Preparation Kl Zeolite Was Obtained From Chemie Uetimentioning

confidence: 99%

Section: Sample Preparation Kl Zeolite Was Obtained From Chemie Uetimentioning

confidence: 99%

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Support Effects on Hydrogen Desorption, Isotope Exchange, Chemical Reactivity, and Magnetism of Platinum Nanoclusters in KL Zeolite

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Electron Paramagnetic Resonance Applications to Catalytic and Porous Materials

Goldfarb

2008

Electron Paramagnetic Resonance

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Metal–Support Interactions

Ruppert

Weckhuysen

2008

Handbook of Heterogeneous Catalysis

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Supported metal catalysts are comprised of small metal nanoparticles dispersed on the surface of a support material. Previously, the role of the support oxide was commonly thought to be limited to provide large metal surface areas. However, it is now generally accepted that the activity and selectivity of these catalysts are dependent on the type and composition of the support used [1][2][3] or even on thermal pretreatment conditions of catalysts consisting of the same metal and support [4]. In other words, the role of the support goes well beyond strictly physical phenomena such as increasing the surface area, and the specific interaction of the support with the active phase often controls the course of a catalytic reaction.Understanding the effect of the support oxide on the properties of metal nanoparticles is a challenging subject because it opens a way towards modeling and tuning of the catalytic properties by a deliberate choice of the support oxide [5][6][7][8]. As a consequence, gaining an insight into the interfacial structure between metal nanoparticles and their support, particularly under relevant reaction conditions, has been an important topic in the field of heterogeneous catalysis for decades [9,10]. Therefore,

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Electron paramagnetic resonance studies of a platinum cluster in Linde L and faujasite zeolites

Cited by 19 publications

References 52 publications

Support Effects on Hydrogen Desorption, Isotope Exchange, Chemical Reactivity, and Magnetism of Platinum Nanoclusters in KL Zeolite

Support Effects on Hydrogen Desorption, Isotope Exchange, Chemical Reactivity, and Magnetism of Platinum Nanoclusters in KL Zeolite

Electron Paramagnetic Resonance Applications to Catalytic and Porous Materials

Metal–Support Interactions

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