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Measuring acidity by temperature-programmed desorption

โœ Scribed by R.L. Mieville; B.L. Meyers


Book ID
113176799
Publisher
Elsevier Science
Year
1982
Tongue
English
Weight
173 KB
Volume
74
Category
Article
ISSN
0021-9517

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The acidity of H-form zeolites which include mordenite, ZSM-5, Y-faujasite, and those modified by cation exchange or deahrmination was measured by temperature-programmed desorption (TPD) of NHp. Ammonia was adsorbed at 373 K to eliminate the contribution of very weak acid sites and improve the spect

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## Abstaact Mathematical models used to achieve the deconvolution of temperature-programmed desorption (TPD ) spectra from heterogeneous surfaces generally rely on assumptions about the pre-exponential factor or on the variation of the activation energy of desorption with coverage. In contrast, in