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- W1480346095 abstract "Publisher Summary This chapter presents an overview of experimental results on the H-D exchange of zeolitic hydroxyl groups in two-component Pt/NaY - HNaY. The exchange process at room temperature has been studied by means of infrared spectroscopy. Three different deuteration pathways were taken into account when platinum is present: Deuterium spillover, deuteration by deuterium from the gas phase, and deuteration by heavy water. The experimental conditions have been modified to distinguish between these possible reactions pathways. The H-D exchange after deuterium loading in the absence of water and heavy water was prevented after CO pre-adsorption, and hindered in the presence of a magnetic field directed perpendicularly to the main direction of diffusion (from the Pt/NaY to the HNaY sample component). Deuteration after addition of heavy water was influenced neither by CO pre-adsorption nor by application of a magnetic field. In the absence of platinum no H-D exchange occurred after deuterium introduction. The results were explained by a reaction pathway via deuterium spillover, i.e. active species were formed on platinum (which is prevented by CO pre-adsorption), and diffuse as electrically charged species on the zeolitic surface (which is hindered by an external magnetic field)." @default.
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- W1480346095 date "1995-01-01" @default.
- W1480346095 modified "2023-09-27" @default.
- W1480346095 title "Deuteration of zeolitic hydroxyl groups in the presence of platinum — Evidence for a spillover reaction pathway" @default.
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- W1480346095 doi "https://doi.org/10.1016/s0167-2991(06)81923-3" @default.
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