Infrared investigation of hydrogen adsorption on alumina-supported platinum

Primet, Michel; Basset, Jean‐Marie; Mathieu, Michel-Vital; Prettre, Marcel

doi:10.1016/0021-9517(73)90129-2

Cited by 52 publications

(16 citation statements)

References 9 publications

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“…1a, appearing at 2000 cm −1 and 1800 cm −1 with both H 2 and D 2 , are assigned to CO bound in a linear and bridged configuration to Pt, respectively, in accordance with earlier interpretations. 11,14 The 2000 cm −1 band is different from the case when CO gas is adsorbed alone (see Supporting Information, Fig. S1).…”

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confidence: 91%

“…Although there is some level of agreement on the assignment of the high-energy band to a Pt–H vibration, the low-energy band is a subject of controversy. It has been argued in ref that the IR transition of interstitially bound hydrogen would be too weak and too broad to be detected by IR spectroscopy because of the absence of a discrete covalent bond to a single Pt atom. Instead, the low-energy band has been assigned to linearly bound carbon monoxide formed from carbonate complexes that were present in the alumina support in that particular case.…”

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confidence: 99%

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Characterization of the Platinum–Hydrogen Bond by Surface-Sensitive Time-Resolved Infrared Spectroscopy

Paleček

Tek

Lan

et al. 2018

J. Phys. Chem. Lett.

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The vibrational dynamics of Pt-H on a nanostructured platinum surface has been examined by ultrafast infrared spectroscopy. Three bands are observed at 1800, 2000, and 2090 cm, which are assigned to Pt-CO in a bridged and linear configuration and Pt-H, respectively. Lifetime analysis revealed a time constant of (0.8 ± 0.1) ps for the Pt-H mode, considerably shorter than that of Pt-CO because of its stronger coupling to the metal substrate. Two-dimensional attenuated total reflection infrared spectroscopy provided additional evidence for the assignment based on the anharmonic shift, which is large in the case of Pt-H (90 cm), in agreement with the density functional theory calculations. The absorption cross section of Pt-H is smaller than that of the very strong Pt-CO vibration by only a modest factor of ∼1.5-3. Because Pt-H is transiently involved in catalytic water splitting on Pt, the present spectroscopic characterization paves the way for in-operando kinetic studies of such reactions.

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confidence: 91%

mentioning

confidence: 99%

Characterization of the Platinum–Hydrogen Bond by Surface-Sensitive Time-Resolved Infrared Spectroscopy

Paleček

Tek

Lan

et al. 2018

J. Phys. Chem. Lett.

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“…Reversibly bound hydrogen is IR active and gives a band centred at ca. 2120 cm −1 ; irreversibly bound hydrogen on Pt/Al 2 O 3 is not discernible via IR spectroscopy [14]. It was also found that the IR signal corresponding to the weakly bound hydrogen and catalytic activity were both pressure dependent, furthering the argument that it was indeed weakly bound hydrogen which was responsible for benzene hydrogenation [13].…”

Section: Introductionmentioning

confidence: 97%

A Comparison of Experimental Procedures for the Application of Infrared Spectroscopy to Probe the Surface Morphology of an Alumina-Supported Palladium Catalyst

et al. 2021

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Structure/function relationships in heterogeneous catalysis play an important role in catalyst design strategies. The combination of chemisorption of suitable probe molecules alongside application of infrared spectroscopy is an established technique for providing information on the metal crystallite morphology of supported metal catalysts. Following a review of key literature on this topic, a variety of experimental arrangements that may be adopted for this task are examined. Specifically, the adsorption of CO over a 5wt% Pd/Al2O3 catalyst is investigated using transmission and diffuse reflectance sampling options and two research grade spectrometers. Although comparable spectra are obtained on all the platforms examined, differences are noted. In particular, temperature-programmed IR spectroscopy on one platform enables resolution of two features assigned to linear CO bound to the Pd particles. The relevance of this sub-division of terminal sites with respect to selective hydrogenation reactions is briefly considered.

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“…The behavior of adsorbed H species has been poorly studied despite their involvement in many key reactions (such as hydrogenation, hydrodesulfurization, reforming process, and ammonia synthesis): even for the PtÀ H vibrations that display IR absorption bands, their assignments are still under debate owing to the very small absorption cross section and/or possible interfering bands of contaminated CO species. [43][44][45] XAS as a characterization technique is considered non-surfacesensitive, however, in the case of nanoparticle catalysts, the spectra can reflect the influence of surface adsorbates owing to the high proportion of surface atoms in each particle. Originally, Asakura et al found that the Pt L 3 -edge X-ray absorption nearedge structure (XANES) spectra quantitively reflect the H species adsorbed on small Pt particles.…”

Section: Introductionmentioning

confidence: 99%

Formation of CH₄ at the Metal‐Support Interface of Pt/Al₂O₃ During Hydrogenation of CO₂: Operando XAS‐DRIFTS Study

et al. 2022

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The adsorbed intermediates on supported metal catalysts govern their catalytic activity and selectivity, although it is difficult to quantify them under the working states. We monitored the adsorbed species on Al 2 O 3 -and SiO 2 -supported Pt nanoparticle catalyst during hydrogenation of CO 2 and elucidated the CH 4 -formation sites at the metal-support interface of Pt/Al 2 O 3 , by using a combination of X-ray absorption spectroscopy (XAS) and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) with product analysis (oper-ando XAS-DRIFTS). Pt L 3 -and L 2 -edge X-ray absorption near edge structure spectra quantified the unoccupied states of Pt species, revealing that both of hydrogen and CO species adsorbed on the Pt surface of Pt/Al 2 O 3 , whereas a relatively smaller amount of hydrogen species adsorbed on Pt/SiO 2 . The DRIFTS and reaction results indicated that the CO species coadsorbed with hydrogen species on the perimeter Pt sites were hydrogenated to CH 4 at the interface between Pt particles and Al 2 O 3 surface.

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Infrared investigation of hydrogen adsorption on alumina-supported platinum

Cited by 52 publications

References 9 publications

Characterization of the Platinum–Hydrogen Bond by Surface-Sensitive Time-Resolved Infrared Spectroscopy

Characterization of the Platinum–Hydrogen Bond by Surface-Sensitive Time-Resolved Infrared Spectroscopy

A Comparison of Experimental Procedures for the Application of Infrared Spectroscopy to Probe the Surface Morphology of an Alumina-Supported Palladium Catalyst

Formation of CH₄ at the Metal‐Support Interface of Pt/Al₂O₃ During Hydrogenation of CO₂: Operando XAS‐DRIFTS Study

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Infrared investigation of hydrogen adsorption on alumina-supported platinum

Cited by 52 publications

References 9 publications

Characterization of the Platinum–Hydrogen Bond by Surface-Sensitive Time-Resolved Infrared Spectroscopy

Characterization of the Platinum–Hydrogen Bond by Surface-Sensitive Time-Resolved Infrared Spectroscopy

A Comparison of Experimental Procedures for the Application of Infrared Spectroscopy to Probe the Surface Morphology of an Alumina-Supported Palladium Catalyst

Formation of CH4 at the Metal‐Support Interface of Pt/Al2O3 During Hydrogenation of CO2: Operando XAS‐DRIFTS Study

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Formation of CH₄ at the Metal‐Support Interface of Pt/Al₂O₃ During Hydrogenation of CO₂: Operando XAS‐DRIFTS Study