期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 11, 期 23, 页码 10060-10066出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c03020
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资金
- European Union [ERC-AdG-2014-671093]
- Spanish Government through Severo Ochoa (MINECO) [SEV-2016-0683]
- AEI/FEDER, UE [MAT2017-82288-C2-1-P]
- European Union's Horizon 2020 research and innovation program (consolidator ERC grant) [647755]
- Research Foundation - Flanders (FWO)
The dynamic nature of the copper cations acting as active sites for selective catalytic reduction of nitrogen oxides with ammonia is investigated using a combined theoretical and spectroscopic approach. Ab initio molecular dynamics simulations of Cu-CHA catalysts in contact with reactants and intermediates at realistic operating conditions show that only ammonia is able to release Cu+ and Cu2+ cations from their positions coordinated to the zeolite framework, forming mobile Cu+(NH3)(2) and Cu2+(NH3)(4) complexes that migrate to the center of the cavity. Herein, we give evidence that such mobilization of copper cations modifies the vibrational fingerprint in the 800-1000 cm(-1) region of the IR spectra. Bands associated with the lattice asymmetric T-O-T vibrations are perturbed by the presence of coordinated cations, and allow one to experimentally follow the dynamic reorganization of the active sites at operating conditions.
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