Adsorption of trichloro- and trifluoromethane in Y-zeolites as studied by IR spectroscopy and multinuclear solid-state NMR

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DOI 10.1039/A808296K
Impact Factor 3.676
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Abstract

The adsorption of CH(D)Cl3 and CHF3 on a series of alkali-exchanged Y-zeolites was studied by 1H- and 23Na-NMR and by FTIR spectroscopy. Several adsorption structures were detected which involve H-bonding C–H(D)···OZ between the acidic C–H(D) group and basic OZ-framework atoms and between the exchangeable cations and halogen atoms of the probe molecules. 1H-NMR demonstrated rapid exchange between several adsorption species and IR spectroscopy permitted detection of at least two different species, namely purely H-bonded species I and species II and/or III involving cation–halogen interactions. It is inferred that these species can undergo facile interconversion and that such processes may be involved in the rapid exchange as detected by NMR. Based on 23Na-NMR results it is concluded that adsorption of CHCl3 on NaY modifies the negative charge distribution in the zeolite framework. The adsorption-induced C–H(D)-stretching frequency shift of trichloromethane is considered to be a measure of the base strength of the framework OZ-atoms.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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