Abstract
By combining the methods of calorimetry and spectroscopy using CO as a probe molecule, we obtained the evidence supporting the decomposition reaction of NO on two types of monovalent copper-ion (Cu+) species in CuZSM-5 zeolite. These Cu+ species showed the characteristic emission bands at 21,000 and 18,500 cm-1 and, respectively, gave the CO adsorption heats of 122 and 110 kJ mol-1. Taking account of our previous EXAFS data, it was found that the former species take the two-coordinated structure involving lattice oxygen atoms, while the latter ones the three-coordinated structure. In this paper, we also emphasized the validity of our original assignment of active sites on CuZSM-5 for N2 adsorption at room temperature; three-coordinated Cu+ species adsorb N2 molecules.
Original language | English |
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Pages (from-to) | 159-165 |
Number of pages | 7 |
Journal | Microporous and Mesoporous Materials |
Volume | 86 |
Issue number | 1-3 |
DOIs | |
Publication status | Published - Nov 28 2005 |
Keywords
- CO adsorption
- CuZSM-5
- Monovalent copper-ion
- N adsorption
- NO decomposition
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials