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- W1549205932 abstract "TPD-IR experiments of CO desorption were performed. The process of CO adsorption was followed by IR spectroscopy and the process of desorption was studied both by TPD and by IR. TPD-IR studies evidenced that three kinds of Cu+ sites of increasing energy of CO adsorption were present in CuZSM-5. They are characterised by IR bands of adsorbed CO at 2165, 2160 and 2155 cm−1 respectively. The same three kinds of Cu+ sites were found also in NaCuZSM-5 zeolites of lower Cu contents (Na/Cu exchange degrees 20 and 40%). If small amounts of CO is adsorbed at room temperature, CO adsorbs on all three kinds of Cu+ species without selecting the most favourable ones. At higher temperatures (340–460 K) CO desorbs from less favourable sites of higher CO stretching frequencies (2165 and 2160 cm−1) and readsorbs on most favourable ones (CO band 2155 cm−1). The sites of the lowest C-O stretching frequency (2155 cm−1) show the strongest electrodonor properties and the strongest effect of π-backdonation of d-electrons of copper to π* antibonding molecular orbital of CO. This effect weakens the C-O bonding. Cu+ sites of the lowest C-O frequency are probably the most effective in activation of NO molecule and therefore the most active in “denox” process." @default.
- W1549205932 created "2016-06-24" @default.
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- W1549205932 date "2002-01-01" @default.
- W1549205932 modified "2023-09-25" @default.
- W1549205932 title "Heterogeneity of Cu+ in CuZSM-5, TPD-IR studies of CO desorption" @default.
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- W1549205932 doi "https://doi.org/10.1016/s0167-2991(02)80060-x" @default.
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