Comparative Study of Lewis Acid Transformation on Non-reducible and Reducible Oxides Under Hydrogen Atmosphere by In Situ DRIFTS of Adsorbed NH3

Comparative Study of Lewis Acid Transformation on Non-reducible and Reducible Oxides Under... The Lewis acid transformation to Bronsted acid was investigated over the Pt/γ-Al O hybrid catalysts in the presence of 2 3 hydrogen atmosphere by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of adsorbed NH . The changes of FTIR spectra were monitored during the introduction of hydrogen at 40 °C and atmospheric pressure for 130 min. The degrees of Lewis acid transformation were varied by addition of non-reducible (SiO and Al O ) and reducible (ZrO , 2 2 3 2 TiO and CeO ) oxides to the Pt/γ-Al O catalysts as the hybrid catalysts. According to the in situ DRIFTS, the hydrogen 2 2 2 3 temperature programmed reduction (H -TPR), and the hydrogen temperature programmed desorption (H -TPD) results, the 2 2 introduction of hydrogen resulted in a decrease in the amount of ammonia adsorbed on Lewis acid sites, and an increase in the amount of ammonium ions on Bronsted acid sites with time on stream. It is proposed that ammonia migration from Lewis acid sites to Bronsted acid sites occurred during the introduction of hydrogen in the presence of Pt particles when compared to the observation of only observed catalysts (without Pt particles). The addition of reducible oxides http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Topics in Catalysis Springer Journals

Comparative Study of Lewis Acid Transformation on Non-reducible and Reducible Oxides Under Hydrogen Atmosphere by In Situ DRIFTS of Adsorbed NH3

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Chemistry; Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials
ISSN
1022-5528
eISSN
1572-9028
D.O.I.
10.1007/s11244-018-0995-1
Publisher site
See Article on Publisher Site

Abstract

The Lewis acid transformation to Bronsted acid was investigated over the Pt/γ-Al O hybrid catalysts in the presence of 2 3 hydrogen atmosphere by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) of adsorbed NH . The changes of FTIR spectra were monitored during the introduction of hydrogen at 40 °C and atmospheric pressure for 130 min. The degrees of Lewis acid transformation were varied by addition of non-reducible (SiO and Al O ) and reducible (ZrO , 2 2 3 2 TiO and CeO ) oxides to the Pt/γ-Al O catalysts as the hybrid catalysts. According to the in situ DRIFTS, the hydrogen 2 2 2 3 temperature programmed reduction (H -TPR), and the hydrogen temperature programmed desorption (H -TPD) results, the 2 2 introduction of hydrogen resulted in a decrease in the amount of ammonia adsorbed on Lewis acid sites, and an increase in the amount of ammonium ions on Bronsted acid sites with time on stream. It is proposed that ammonia migration from Lewis acid sites to Bronsted acid sites occurred during the introduction of hydrogen in the presence of Pt particles when compared to the observation of only observed catalysts (without Pt particles). The addition of reducible oxides

Journal

Topics in CatalysisSpringer Journals

Published: May 29, 2018

References

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