DOI > 10.5291/ILL-DATA.7-04-144

This proposal is publicly available since 09/14/2020

Title

Inelastic Neutron Scattering study of Brønsted acidity in LTA zeolite

Abstract

The present proposal suggests the use of INS to characterize the acidity of zeolite LTA through the vibrational properties of the different types of hydrogens present as Brønsted acid sites, Si-O(H)-Al&. Those centres are key to the interpretation of the catalytic properties of zeolites. The main objective of the proposal is to correlate vibrational bands in the INS spectra with zeolite acid sites and their strength. The INS results will be combined with NMR, IR, and Raman spectroscopies, and quantum-chemistry calculations to map the location and strength of the acid sites. Samples of different Al content will be analysed, with increasing hydrogen as Al content increases. Samples of high Si/Al will contain less types of hydrogen and allow a better interpretation of the INS spectra. We will focus on certain vibrations of low energy associated to the hydrogens in the zeolite. OH bending modes in zeolites, typically vibrating between 300-1200 cm-1 will help to distinguish the types of centres in LTA zeolite. In-plane SiOH bending is expected at ca. 1150 cm -1, whilst out-of-plane SiOH is expected at ca. 400 cm-1. These bands are expected to shift by 30-40 cm-1 with Al

Experimental Report

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Data Citation

The recommended format for citing this dataset in a research publication is in the following format:

SASTRE German Ignacio; JIMENEZ RUIZ Monica; LEMISHKO Tetiana; REY Fernando and VALENCIA Susana. (2015). Inelastic Neutron Scattering study of Brønsted acidity in LTA zeolite. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-144

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Metadata

Experiment Parameters

  • Environment temperature

    10K
  • Experiment energy

    0-2500 cm-1
  • Experiment res energy

    2% incident energy

Sample Parameters

  • Formula

    • LTA (Si/Al = 30)
    • LTA (Si/Al = 5)
    • LTA (Si/Al = 1.9)
    • LTA (Si/Al = 5) with CO
    • LTA (Si/Al=5) with CD4
    • LTA (Si/Al = 30) with CO
    • LTA (Si/Al = 30) with CD4
    • LTA (Si/Al = 1.9) with CO
    • LTA (Si/Al = 1.9) with CD4