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Operando chemistry of catalyst surfaces during catalysis
Jian Dou1, Zaicheng Sun2, Adedamola A Opalade1
1Department of Chemical and Petroleum Engineering and Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA. franklin.feng.tao@ku.edu.
Chemical Society Reviews
|March 31, 2017
Summary
In situ/operando studies reveal catalyst surface chemistry changes during reactions, offering crucial insights into catalytic mechanisms often missed by ex situ analysis. Advances in instrumentation enable real-time characterization of catalyst nanoparticles under reaction conditions.
Area of Science:
- Catalysis
- Surface Science
- Materials Chemistry
Background:
- Understanding catalyst surface chemistry during reactions is vital for elucidating catalytic mechanisms.
- Ex situ characterization may not reflect the dynamic catalyst surface under reaction conditions.
- In situ/operando studies are essential for accurate mechanistic understanding.
Purpose of the Study:
- To discuss the differences between ex situ and in situ/operando catalyst studies.
- To review technical challenges and instrumentation innovations for in situ/operando catalyst characterization.
- To examine catalyst surface restructuring under reaction conditions.
Main Methods:
- Review of electron-based analytical techniques adapted for in situ/operando studies.
- Discussion of instrumentation and technological advancements enabling real-time catalyst characterization.
- Analysis of catalyst surface restructuring phenomena.
Main Results:
- In situ/operando studies provide unique insights into catalyst nanoparticle chemistry and structure.
- Significant differences exist between ex situ and in situ/operando catalyst characterization.
- Catalyst surfaces undergo restructuring driven by reactant pressure, temperature, and reaction dynamics.
Conclusions:
- In situ/operando techniques are indispensable for understanding catalytic mechanisms at a molecular level.
- Technological advancements have overcome previous limitations in studying catalysts under reaction conditions.
- Further research is needed to address remaining challenges in in situ/operando catalyst characterization.