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- W2012040206 abstract "The interaction of light alkane isomers with zeolite H−LaX was investigated under mild conditions similar to those used in processes such as alkylation. The presence of La3+ cations increases the heat of adsorption compared to HY zeolites and induces a strong polarization on the adsorbed alkanes. The polarization is particularly strong for molecules with a single branching in the 2 position. At high uptake, sorbate−sorbate interactions lead to a further increase of the heat of adsorption. Due to a high loss of entropy, these interactions were only observed when complete pore filling was approached. The specific interaction of different parts of the sorbate molecule was investigated by 13C MAS NMR. It was shown that a positive partial charge is induced on secondary and tertiary carbon atoms. This polarization may be seen as intermediate to hydride abstraction. When molecular water is present on the activated catalyst, it blocks the strongest adsorption sites, but it also contributes to the heat of adsorption of alkanes and surprisingly enhances their polarization." @default.
- W2012040206 created "2016-06-24" @default.
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- W2012040206 date "2007-03-21" @default.
- W2012040206 modified "2023-10-16" @default.
- W2012040206 title "Adsorption and Polarization of Branched Alkanes on H−LaX" @default.
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- W2012040206 doi "https://doi.org/10.1021/jp067312u" @default.
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