Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9617762 | Microporous and Mesoporous Materials | 2005 | 6 Pages |
Abstract
Adsorption of dihydrogen onto the zeolites Na-ZSM-5 and K-ZSM-5 renders the fundamental H-H stretching mode infrared active. The corresponding infrared absorption bands were found at 4101 and 4112 cmâ1 for H2/Na-ZSM-5 and H2/K-ZSM-5, respectively. Thermodynamic characterization of the adsorbed state was carried out by means of variable-temperature infrared spectroscopy; simultaneously measuring integrated band intensity, temperature and equilibrium pressure of the gas phase. For the H2/Na-ZSM-5 system, the standard adsorption enthalpy and entropy resulted to be ÎH° = â10.3 (±0.5) kJ molâ1 and ÎS° = â121 (±10) J molâ1 Kâ1. For H2/K-ZSM-5 corresponding values were â9.1 (±0.5) kJ molâ1 and â124 (±10) J molâ1 Kâ1, respectively.
Related Topics
Physical Sciences and Engineering
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Authors
C. Otero Areán, M. RodrÃguez Delgado, G. Turnes Palomino, M. Tomás Rubio, N.M. Tsyganenko, A.A. Tsyganenko, E. Garrone,