کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5357860 1388225 2010 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen adsorption on the faujasite-type zeolite Mg-X: An IR spectroscopic and thermodynamic study
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Hydrogen adsorption on the faujasite-type zeolite Mg-X: An IR spectroscopic and thermodynamic study
چکیده انگلیسی
Hydrogen adsorption (physisorption) on the faujasite-type zeolite Mg-X was studied by means of variable-temperature (80-140 K) FT-IR spectroscopy. Perturbation of the adsorbed H2 molecules by the cationic adsorbing centres of the zeolite renders the H-H stretching mode IR active, at 4065 cm−1. Simultaneous measurement of IR absorbance and hydrogen equilibrium pressure, for a series of spectra recorded at the increasing temperature, allowed standard adsorption enthalpy and entropy to be determined. They resulted to be ΔH0 = −13 kJ mol−1 and ΔS0 = −114 J mol−1 K−1, respectively. Both, spectroscopic and thermodynamic results are discussed in the broader context of corresponding data for hydrogen adsorption on other alkali and alkaline-earth cation exchanged zeolites, showing that, while an approximate correlation exists between ΔH0 and H-H stretching frequency, deviations can be expected for the case of zeolites containing small metal cations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 256, Issue 17, 15 June 2010, Pages 5281-5284
نویسندگان
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