From The Karlsruhe Institute of Technology [Karlsruher Institut für Technologie] (DE)
December 17, 2020
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Operando X-ray Spectroscopy Brings New Opportunities for Materials and Reaction Diagnostics – Report in Nature Catalysis
Operando X-ray spectroscopy shows what happens in each single part of a working catalyst. Credit: Dr. Dmitry Doronkin, KIT.
For understanding the structure and function of catalysts in action, researchers of Karlsruhe Institute of Technology (KIT), in cooperation with colleagues from the Swiss Light Source SLS of Paul Scherrer Institute (PSI) in Switzerland and the European Synchrotron Radiation Facility (ESRF) in France, have developed a new diagnostic tool. Operando X-ray spectroscopy visualizes the structure and gradients of complex technical catalysts in three dimensions, thus allowing us to look into functioning chemical reactors. The results are re-ported in Nature Catalysis.
Catalysis is indispensable for many branches. 95% of all chemicals are produced using catalysts. Catalysts also play a key role in energy technologies and environmental protection. Catalysts are materials used to accelerate chemical reactions in order to reduce energy consumption and undesired by-products. This chemico-physical principle is the basis of entire systems, examples being catalytic converters in cars or catalysts in power plants to remove pollutants from their exhausts. Technical and industrial catalysts are also applied in fertilizer and polymer production. Often, they must exhibit high pressure resistance and mechanical strength, while additionally operating under dynamic environmental conditions. Even smallest efficiency increases in the removal of pollutants, such as carbon monoxide, nitrogen oxides, and fine dust, from exhaust gases or in the production of green hydrogen will result in major advantages for humans and the environment. To improve existing catalytic materials and processes, however, exact understanding of their function is required. “Whether in a large chemical reactor, in a battery, or underneath your car, technical and industrial catalysts often have a highly complex structure,” says Dr. Thomas Sheppard from the Institute for Chemical Technology and Polymer Chemistry (ITCP) of KIT. “To really understand how these materials function, we need to take a look inside the reactor when the catalyst is working, ideally with an analytical tool to detect the complex 3D structure of the active catalyst.”
Operando X-ray Spectroscopy Provides 3D Images and Major Chemical Information.
Thomas Sheppard directed a study on automotive catalytic converters, the results of which are now reported in Nature Catalysis by the researchers involved from KIT, PSI, and ESRF. For their studies, the team used a newly developed setup and carried out tomography experiments at synchrotron radiation facilities in Switzerland and France. Computer tomography produces 3D images of a sample, including the exterior and interior, without needing to cut it open. By using a special reactor, the researchers performed tomography and X-ray spectroscopy to track an active catalytic process. In this way, they succeeded in observing the 3D structure of an emission control catalyst under conditions just like those in a real automotive exhaust. This so-called operando X-ray spectroscopy provides not only the 3D structure of the sample, but also important chemical information.
Method Suited for Various Catalysts
“Since catalysts often have a rather complex and non-uniform structure, it is important to know whether the entire catalyst volume or only parts of it are performing their chemical function as intended,” explains Johannes Becher from ITCP, one of the main authors of the study. “Operando X-ray spectroscopy lets us see the specific structure and function of every single piece. This tells us whether the catalyst is performing at maximum efficiency or not and, more importantly, it helps us understand the underlying processes.” During reaction, the team observed a structural gradient of the active copper species within the catalyst, which could not be detected previously using conventional analytical tools. This is important diagnostic information in the performance of emission control catalysts. The method itself can be applied to many different catalysts and chemical processes.
New Opportunities for Materials and Reaction Diagnostics
The team’s studies show how visualizing the chemical state of an active catalyst in 3D can bring new opportunities for materials and reaction diagnostics. “Until now, it was not possible to freely select any piece of a working catalyst and understand which reactions take place in there without disturbing it. Now, we can follow exactly which reactions are occurring, where, and why,” says Professor Jan-Dierk Grunwaldt from ITCP. “This is the key to improving our understanding of chemical processes and designing better and more efficient catalysts in future.” Studies using operando X-ray spectroscopy can be carried out at different synchrotron radiation sources, provided that an appropriate sample environment exists. The groups of Jan-Dierk Grunwaldt and Thomas Sheppard will continue their investigations as part of the new Collaborative Research Center “TrackAct” at KIT. “TrackAct” is aimed at under-standing and improving the design and efficiency of emission con-trol catalysts.
See the full article here .
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Mission Statement of KIT
Preamble
The Karlsruhe Institute of Technology [Karlsruher Institut für Technologie] (DE), briefly referred to as KIT, was established by the merger of the Forschungszentrum Karlsruhe GmbH and the Universität Karlsruhe ([TH] on October 01, 2009. KIT combines the tasks of a university of the state of Baden-Württemberg with those of a research center of the Helmholtz Association in the areas of research, teaching, and innovation.
The KIT merger represents the consistent continuation of a long-standing close cooperation of two research and education institutions rich in tradition. The University of Karlsruhe was founded in 1825 as a Polytechnical School and has developed to a modern location of research and education in natural sciences, engineering, economics, social sciences, and the humanities, which is organized in eleven departments. The Karlsruhe Research Center was founded in 1956 as the Nuclear Reactor Construction and Operation Company and has turned into a multidisciplinary large-scale research center of the Helmholtz Association, which conducts research under eleven scientific and engineering programs.
In 2014/15, the KIT concentrated on an overarching strategy process to further develop its corporate strategy. This mission statement as the result of a participative process was the first element to be incorporated in the strategy process.
Mission Statement of KIT
KIT combines the traditions of a renowned technical university and a major large-scale research institution in a very unique way. In research and education, KIT assumes responsibility for contributing to the sustainable solution of the grand challenges that face the society, industry, and the environment. For this purpose, KIT uses its financial and human resources with maximum efficiency. The scientists of KIT communicate the contents and results of their work to society.
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