Abstract
Metal-exchanged zeolites have been widely used in industrial catalysis and separation, but fundamental understanding of their structure–property relationships has remained challenging, largely due to the lack of quantitative information concerning the atomic structures and reaction-relevant adsorption properties of the embedded metal active sites. Here, we report on using low-temperature reactive adsorption of NO to titrate copper-exchanged ZSM5 (Cu-ZSM5). Quantitative descriptors of the atomic structures and adsorption properties of Cu-ZSM5 are established by combining atomistic simulation, density functional theory c, operando molecular spectroscopy, chemisorption and titration measurements. These descriptors are then applied to interpret the catalytic performance of Cu-ZSM5 for NO decomposition. Linear correlations are established to bridge low-temperature adsorption analytics and high-temperature reaction kinetics, which are demonstrated to be generally applicable for understanding the structure–property relationships of metal-exchanged zeolites and foregrounded the development of advanced catalytic materials. Understanding the structure–property relationships of metal-exchanged zeolites is a challenging task. Here, correlations are established between the adsorption properties of Cu-exchanged ZSM5 and the reaction kinetics of NO decomposition, generating descriptors of general applicability to different zeolites.
Highlights
Portraiture of active sites and their adsorption properties represents a grand challenge but utmost task for the development of advanced catalysts
The Cu dimers in Cu-ZSM5 have been probed by using various spectroscopic techniques, including ultraviolet–visible spectroscopy (UV-Vis),[18,19,20] Fourier-transform infrared spectroscopy (FTIR),[20,21,22,23,24,25] resonance Raman spectroscopy (Raman),[26,27] electron paramagnetic resonance (EPR)[28,29,30] and XAS21,31-33
Our work aims to excel the bridge between low-temperature adsorption analytics and high-temperature reaction kinetics in heterogeneous catalysis
Summary
Portraiture of active sites and their adsorption properties represents a grand challenge but utmost task for the development of advanced catalysts.
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