Cuprous species distribution over CuCl/NaY dependent on acidity and their CO Adsorption/desorption performance study

Abstract

• NaY zeolite was synthesized and its acidity was adjusted through NH 4 Cl exchange methods. • Three NaY-Cu samples with identical Cu loading presented different Cu + /Cu 2+ distribution dependent on their acidity. • NaY-Cu presented superior CO storage compared with NaY supports for strong Cu + CO bond. • Cu + cations located in site III and V dominated the CO adsorption compared to site I, II and IV. The impact of acidity on copper species distribution during solid exchange process of CuCl/NaY mixture and their CO storage performance were evaluated in this work. Firstly, the acidity of home-made Na form faujasite (NaY-10) was adjusted through ammonium ion exchange method to obtain its H from supports with different acidity. The bulk characterization results demonstrated the NaY-Cu structure collapsed in varying degrees during solid exchange process, but NaY-Cu samples exhibited superior CO storage ability compared with the corresponding NaY supports. DRIFTs of CO adsorption and simulation through first-principles calculations were further examined to reveal the CO adsorption sites and CO adsorption behaviors over hydroxyls, Na + cations and Cu + /Cu 2+ cations. Finally, the relation between faujasite acidity and CuCl distribution was systematically concluded and the CO adsorption/desorption difference between NaY supports and NaY-Cu samples was directly summarized to illustrate their industrial application potential.