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
Topics in Catalysis – Springer Journals
Published: May 29, 2018
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