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- W2047066269 abstract "Microcalorimetric measurements were performed at 195 K for CO and N2 on zeolite H−MFI and on a siliceous MFI in order to characterize the interaction of these molecules with the Brønsted acid sites. On the siliceous MFI, the differential enthalpies of adsorption (isosteric heats) for CO and N2 were found to be essentially constant with coverage at a value of 16 ± 1 kJ/mol. While the isosteric heats for N2 were slightly higher on H−MFI at coverages below one per site, the additional interaction with the Brønsted sites is less than 3 kJ/mol. For CO on H−MFI, microcalorimetry provides evidence for a 1:1 adsorption complex with the acid sites in that the isosteric heats are higher on H−MFI at low coverages and approach the values for the siliceous material at higher coverages. Because the calorimetric data can be fit to a two-site, Langmuir model in which the hydrogen-bonded CO interacts with an additional 10.5 kJ/mol, the results suggest that the Brønsted acid sites in H−MFI are essentially identical in regard to how they interact with CO." @default.
- W2047066269 created "2016-06-24" @default.
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- W2047066269 date "1999-04-20" @default.
- W2047066269 modified "2023-10-16" @default.
- W2047066269 title "Calorimetric Investigation of CO and N<sub>2</sub> for Characterization of Acidity in Zeolite H−MFI" @default.
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- W2047066269 doi "https://doi.org/10.1021/jp990157h" @default.
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