FTIR Study of CO and NO Coadsorption on Cu-ZSM-5: Does a Cu+(CO)(NO) Complex Exist?

Title:FTIR Study of CO and NO Coadsorption on Cu-ZSM-5: Does a Cu+(CO)(NO) Complex Exist?

Volume: 6 Issue: 2

Author(s): Videlina Zdravkova, Nikola Drenchev, Kristina Chakarova, Mihail Mihaylov and Konstantin Hadjiivanov

Affiliation:

Keywords: Adsorption, carbon monoxide, coadsorption, Cu-ZSM-5, FTIR spectroscopy, nitrogen monoxide, zeolites.

Abstract: Metal cations that are exchanged in zeolites are generally characterized by a low coordination number and can adsorb more than one small molecule. For instance, Cu+ ions exchanged in ZSM-5 (and in other zeolites) can bind, at low temperature, up to three CO and up to two NO molecules. Although mixed aqua-carbonyl complexes are easily formed, here we show that no mixed carbonyl-nitrosyl species are produced. Instead, NO adsorption on Cu-ZSM-5 with pre-formed Cu+-CO species leads to formation of dicarbonyls and dinitrosyls according to the reaction: 2 Cu+-CO + 2 NO  Cu+(CO)2 + Cu+(NO)2. The role of the ligand and the nature of the bond formed on the production of mixed ligand complexes are discussed.

Cite this article as:

Zdravkova Videlina, Drenchev Nikola, Chakarova Kristina, Mihaylov Mihail and Hadjiivanov Konstantin, FTIR Study of CO and NO Coadsorption on Cu-ZSM-5: Does a Cu+(CO)(NO) Complex Exist?, Current Physical Chemistry 2016; 6 (2) . https://dx.doi.org/10.2174/1877946806666160120221645