Abstract
Understanding the behavior and dynamic structural transformation of subnanometric metal species under reaction conditions will be helpful for understanding catalytic phenomena and for developing more efficient and stable catalysts based on single atoms and clusters. In this work, the evolution and stabilization of subnanometric Pt species confined in MCM-22 zeolite has been studied by in situ transmission electron microscopy (TEM). By correlating the results from in situ TEM studies and the results obtained in a continuous fix-bed reactor, it has been possible to delimitate the factors that control the dynamic agglomeration and redispersion behavior of metal species under reaction conditions. The dynamic reversible transformation between atomically dispersed Pt species and clusters/nanoparticles during CO oxidation at different temperatures has been elucidated. It has also been confirmed that subnanometric Pt clusters can be stabilized in MCM-22 crystallites during NO reduction with CO and H2.
Highlights
Understanding the behavior and dynamic structural transformation of subnanometric metal species under reaction conditions will be helpful for understanding catalytic phenomena and for developing more efficient and stable catalysts based on single atoms and clusters
As lower loadings can be a limitation for some practical applications, it is necessary to improve the loading of Pt in MCM-22 while preserving the dispersion and stability of the subnanometric Pt species
To directly observe and obtain more detailed information on the evolution process of subnanometric metal species under redox and reaction conditions, we report an in situ transmission electron microscopy (TEM) study with Pt@MCM-22 catalyst with well-defined metal species confined in the zeolite structure
Summary
Understanding the behavior and dynamic structural transformation of subnanometric metal species under reaction conditions will be helpful for understanding catalytic phenomena and for developing more efficient and stable catalysts based on single atoms and clusters. To directly observe and obtain more detailed information on the evolution process of subnanometric metal species under redox and reaction conditions, we report an in situ TEM study with Pt@MCM-22 catalyst with well-defined metal species confined in the zeolite structure.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
