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- W2045267906 abstract "Abstract Adsorption of carbon monoxide on different Ag + -exchange sites of Ag–ZSM-5 zeolite has been investigated using density functional theory. The coordination and local geometry of the Ag + ion in Ag–ZSM-5 as well as adsorption structures and energies of CO adsorbed on these sites are explored extensively. The structure of Ag + -exchange sites, location of the Al atom on the T site, and number of the Al atoms contained in the sites are considered in the theoretical calculations. The calculated results show that the Ag O coordination number of two is strongly preferred before and after CO adsorption. The Ag O bond lengths are in a broad range of 2.2–2.9 A, and the Ag C bond lengths for CO adsorbed on Ag–ZSM-5 zeolite are calculated to be 2.0–2.2 A. Both Ag O and Ag C bond lengths for CO–Ag–ZSM-5 complex are longer than those for CO–Cu–ZSM-5 complex. The calculated adsorption energy of CO adsorbed on the I2 sites is between 28.5 and 29.6 kcal/mol, and that on the Z5, Z6, M5 and M6 sites containing one Al atom on the T position is between 11.3 and 18.9 kcal/mol whereas the calculated adsorption energy of CO adsorbed on the M7 site containing one Al atom is 19.9 kcal/mol. The introduction of the two Al atoms to the Ag + -exchange site results in a reduction of CO adsorption energy. In general, the adsorption energy of CO on Ag–ZSM-5 is lower than that on Cu–ZSM-5. The predicted coordination of the Ag + ion, bond lengths of Ag O and Ag C as well as adsorption energy are in accord with available experimental results." @default.
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- W2045267906 date "2012-10-01" @default.
- W2045267906 modified "2023-09-25" @default.
- W2045267906 title "Adsorption of carbon monoxide on Ag(I)-ZSM-5 zeolite: An ab initio density functional theory study" @default.
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- W2045267906 doi "https://doi.org/10.1016/j.apsusc.2012.05.162" @default.
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