A vibrational study of the OH and OD bending modes of the Brönsted acid sites in zeolites

Jacobs, Wpjh; Wolput, van J H M C Jos; Santen, van Ra Rutger; Jobic, H.

doi:10.1016/0144-2449(94)90005-1

Cited by 40 publications

(33 citation statements)

References 24 publications

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“…No features were detected in this window with the H-ZSM-5 sample. However, deuteroxylation led to appearance of a very intense band around 890 cm À1 (spectrum not shown) assigned to d(OD) modes [56].…”

Section: Background Spectra Of H-zsm-5 and D-zsm-5mentioning

confidence: 98%

Interaction of benzene with hydroxyl groups in zeolites: A FTIR study of C6H6 and C6D6 adsorption on H-ZSM-5 and D-ZSM-5

Chakarova

Hadjiivanov

2011

Microporous and Mesoporous Materials

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Section: Background Spectra Of H-zsm-5 and D-zsm-5mentioning

confidence: 98%

Interaction of benzene with hydroxyl groups in zeolites: A FTIR study of C6H6 and C6D6 adsorption on H-ZSM-5 and D-ZSM-5

Chakarova

Hadjiivanov

2011

Microporous and Mesoporous Materials

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“…This would be due to the fact that the energy gap between the O-D accepting modes and their subsequent accepting modes is a lot smaller than the energy gap between the O-D oscillator and its accepting modes: possible accepting modes for the O-D vibration relaxation process, e.g., O-D bending modes or Si/Al-O stretching modes, all have frequencies ranging from 400 to 1000 cm Ϫ1 . 19,[23][24][25] A smaller energy gap implies that less accepting modes are necessary for deexcitation of these modes. Theory predicts that the vibrational energy transfer possibility increases by at least one order of magnitude when one less accepting mode is needed for deexcitation.…”

Section: B Fast Energy Delocalizationmentioning

confidence: 99%

Fast energy delocalization upon vibrational relaxation of a deuterated zeolite surface hydroxyl

Bonn

Brugmans

Kleyn

et al. 1995

The Journal of Chemical Physics

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. (1995). Fast energy delocalization upon vibrational relaxation of a deuterated zeolite surface hydroxyl. Chemical Physics, 102(5), 2181-2185. DOI: 10.1063/1.468740 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. In this time-resolved study of vibrational dynamics of deuterated surface hydroxyls at acid sites in the zeolite Mordenite, we investigate the O-D T 1 vibrational lifetime and transient band shifts. It is shown that after infrared excitation of the stretching mode of a surface hydroxyl, the excess energy is rapidly distributed over delocalized low-energy lattice modes upon de-excitation. This is asserted from the observation that nonexcited hydroxyls are perturbed by the relaxation of their excited counterparts immediately after this relaxation. This observation can be made owing to better resolution in transient transmission spectroscopy obtained by deuteration of the surface hydroxyls. This assignment allows for accurate estimates of lattice temperatures after relaxation of the vibration. Further, from the observation that the vibrational lifetime is dependent on frequency ͑increasing from 25 to 70 ps with increasing frequency͒, it is concluded that the deuterated acidic protons are hydrogen bonded to lattice oxygen atoms in the zeolite.

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“…2A shows sharp, distinct vibrational bands. The higher-energy bands resemble the vibrational modes of HNa-Y zeolite which could previously be measured down to about 290 cm −1 [8,9]. In Fig.…”

Section: Resultsmentioning

confidence: 96%

Low-frequency Vibrational Dynamics of Amorphous and Crystalline Silica

Albers¹,

Michael

Rotgerink

et al. 2012

Zeitschrift Für Naturforschung B

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RCrystalline silica shows strong, sharp signals at about 77 and 130 cm −1 in the inelastic neutron scattering spectrum that are missing or strongly different, broadened and shifted to lower frequency for the case of precipitated and fumed silica. The presence or absence of these signals is a sensitive signature of crystallinity or amorphicity in silica. The low-frequency phonon density of states of precipitated and fumed silica is typical for completely amorphous materials. This observation is in perfect agreement with data from X-ray diffraction and high-resolution transmission electron microscopy. The amorphicity is retained during granulation post-treatments.

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A vibrational study of the OH and OD bending modes of the Brönsted acid sites in zeolites

Cited by 40 publications

References 24 publications

Interaction of benzene with hydroxyl groups in zeolites: A FTIR study of C6H6 and C6D6 adsorption on H-ZSM-5 and D-ZSM-5

Interaction of benzene with hydroxyl groups in zeolites: A FTIR study of C6H6 and C6D6 adsorption on H-ZSM-5 and D-ZSM-5

Fast energy delocalization upon vibrational relaxation of a deuterated zeolite surface hydroxyl

Low-frequency Vibrational Dynamics of Amorphous and Crystalline Silica

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