31P Solid-State NMR Spectroscopy of Adsorbed Phosphorous Probe Molecules: Acidity Characterization of Solid Acid Carbonaceous Materials for Catalytic Applications

Garg, Bhaskar

doi:10.1007/978-3-319-92955-2_14

Cited by 2 publications

(1 citation statement)

References 183 publications

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“…First, the samples (pristine Na13X, X1.4H, X1.4H-RT and X1.4H-450) were probed with trimethyl phosphorus (TMP), and 31 P MAS SSNMR spectra were collected. Figure a shows a strong peak at −59 ppm in all of the samples, which can be assigned to physisorption of TMP. , Interestingly, a detectable peak located from −4 to −5 ppm can be clearly seen in all Ru-loaded 13X zeolite samples (X1.4H, X1.4H-RT and X1.4H-450), which is attributed to the strong BAS (protonic in nature) to account for the chemical upshift . It is noticed that no such strong BAS peak can be identified by the probe SSNMR for the Na13X sample, suggesting that the Na + ions have replaced nearly all of the H + from the BAS.…”

Section: Resultsmentioning

confidence: 93%

Confined Ru Sites in a 13X Zeolite for Ultrahigh H₂ Production from NH₃ Decomposition

Leung

Hong

et al. 2023

J. Am. Chem. Soc.

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Catalytic NH 3 synthesis and decomposition offer a new promising way to store and transport renewable energy in the form of NH 3 from remote or offshore sites to industrial plants. To use NH 3 as a hydrogen carrier, it is important to understand the catalytic functionality of NH 3 decomposition reactions at an atomic level. Here, we report for the first time that Ru species confined in a 13X zeolite cavity display the highest specific catalytic activity of over 4000 h −1 for the NH 3 decomposition with a lower activation barrier, compared to most reported catalytic materials in the literature. Mechanistic and modeling studies clearly indicate that the N−H bond of NH 3 is ruptured heterolytically by the frustrated Lewis pair of Ru δ+ −O δ− in the zeolite identified by synchrotron X-rays and neutron powder diffraction with Rietveld refinement as well as other characterization techniques including solid-state nuclear magnetic resonance spectroscopy, in situ diffuse reflectance infrared transform spectroscopy, and temperature-programmed analysis. This contrasts with the homolytic cleavage of N−H displayed by metal nanoparticles. Our work reveals the unprecedented unique behavior of cooperative frustrated Lewis pairs created by the metal species on the internal zeolite surface, resulting in a dynamic hydrogen shuttling from NH 3 to regenerate framework Brønsted acid sites that eventually are converted to molecular hydrogen.

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Section: Resultsmentioning

confidence: 93%

Confined Ru Sites in a 13X Zeolite for Ultrahigh H₂ Production from NH₃ Decomposition

Leung

Hong

et al. 2023

J. Am. Chem. Soc.

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Nb(V)-containing saponite: A versatile clay for the catalytic degradation of the hazardous organophosphorus pesticide paraoxon under very mild conditions

Marchesi,

Econdi,

Paul

et al. 2024

Heliyon

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31P Solid-State NMR Spectroscopy of Adsorbed Phosphorous Probe Molecules: Acidity Characterization of Solid Acid Carbonaceous Materials for Catalytic Applications

Cited by 2 publications

References 183 publications

Confined Ru Sites in a 13X Zeolite for Ultrahigh H₂ Production from NH₃ Decomposition

Confined Ru Sites in a 13X Zeolite for Ultrahigh H₂ Production from NH₃ Decomposition

Nb(V)-containing saponite: A versatile clay for the catalytic degradation of the hazardous organophosphorus pesticide paraoxon under very mild conditions

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31P Solid-State NMR Spectroscopy of Adsorbed Phosphorous Probe Molecules: Acidity Characterization of Solid Acid Carbonaceous Materials for Catalytic Applications

Cited by 2 publications

References 183 publications

Confined Ru Sites in a 13X Zeolite for Ultrahigh H2 Production from NH3 Decomposition

Confined Ru Sites in a 13X Zeolite for Ultrahigh H2 Production from NH3 Decomposition

Nb(V)-containing saponite: A versatile clay for the catalytic degradation of the hazardous organophosphorus pesticide paraoxon under very mild conditions

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Product

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Confined Ru Sites in a 13X Zeolite for Ultrahigh H₂ Production from NH₃ Decomposition

Confined Ru Sites in a 13X Zeolite for Ultrahigh H₂ Production from NH₃ Decomposition