2023-09-21 21:10:00
Zeolites encapsulating metal species (also called metal@zeolite) are an important type of heterogeneous catalysts. Compared to traditional supported catalysts, they offer consistently superior performance in many key reactions, and have become a major focus of research.
Remarkable progress has been made in the synthesis, characterization and study of the performance of metal species (typically metal aggregates and metal oxides) confined in zeolites.
Although considerable advances have been made in the synthesis, characterization and application in catalysis of metal@zeolite, many challenges remain to be met. A team of researchers summarized progress in this area in recent years, in an article published in Industrial Chemistry & Materials.
Confinement of metal species in zeolites is a promising avenue for maintaining small and uniform metal aggregates, protecting them once morest sintering and poisoning, and selecting reactants, products, and transition states in catalytic reactions. However, confinement can also increase diffusion barriers and sacrifice acid sites via metal-framework interaction. The resulting catalytic effect is therefore complex.
Over the past ten years, metal@zeolites have been used in numerous catalytic processes, showing excellent performance. In this review, their applications in reactions involving hydrogen have been summarized.
There remains great room for improvement for metal@zeolite. In the future, the development of in situ/operando characterization techniques and optimization of synergistic effects between metal species and acid functions will be crucial.
“Through this study, researchers can better understand the confinement effect of zeolites. At the same time, it provides a reference for the design of zeolite-encapsulated metal catalysts with better performance.“, concluded Zhijie Wu, professor at the China University of Petroleum in Beijing.
Synthetic
This article presents zeolites encapsulating metal species as a promising advance in the field of heterogeneous catalysis. Although challenges remain, their excellent performance in various catalytic processes makes them a future research focus. Progress in their characterization and understanding of the catalytic effects will make it possible to optimize their potential.
For a better understanding
What is a zeolite encapsulating a metallic species?
It is a zeolite in which metallic species such as aggregates or metallic atoms are confined in the micropores.
What are their advantages in catalysis?
Containment makes it possible to maintain nanometric sizes, protect once morest sintering and poisoning. Their catalytic performance is often better.
By techniques such as in-situ hydrothermal synthesis or the conversion of dry gels. The metal is introduced then confined in the zeolite structure.
By various techniques such as electron microscopy, X-ray diffraction or X-ray absorption spectroscopy.
What are the challenges to overcome?
Improve thermal stability, reduce diffusional limitations, better understand catalytic effects.
Article : “Recent advances in the synthesis, characterization, and catalytic consequence of metal species confined within zeolite for hydrogen-related reactions’ – DOI: 10.1039/D3IM00074E
Main illustration legend: Recent advances in the synthesis, characterization and catalytic consequences of metal species confined in zeolites for hydrogen-related reactions. Credit: Zhijie Wu, China University of Petroleum-Beijing,
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