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Surface silanol groups of silica, which never revealed any Brønsted acidity, are shown to donate protons to adsorbed basic molecules, such as ammonia, pyridine or 2,6-dimethylpyridine, after addition of acids such as SO2 or NO2. The latter, when coadsorbed with bases, interact with the oxygen atoms of silanols leading to OH acidity increase and to protonation. Bases, in turn, enhance chemisorption...
CO interacts with extra‐framework alkali metal cations (M+=) of zeolites to form both M+⋯CO and M+⋯OC species. By using variable‐temperature FTIR spectroscopy, these C‐bonded and O‐bonded species were found to be in a temperature‐dependent equilibrium. For the same cation, the difference in interaction energy depends upon the zeolite framework. Thus, for the equilibrium process ZNa+⋯=CO ⇌ ZNa+⋯OC,...
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