What are the Key Applications of STEM in Catalysis?
STEM is utilized in several key applications within the field of catalysis:
Atomic Resolution Imaging: STEM can achieve sub-angstrom resolution, allowing researchers to visualize individual atoms and their arrangement within the catalyst. This is essential for understanding the relationship between the structure and catalytic activity. Elemental Mapping: By combining STEM with techniques like energy-dispersive X-ray spectroscopy (EDX) or electron energy-loss spectroscopy (EELS), scientists can obtain detailed elemental maps, showing the distribution of different elements within the catalyst. In-situ Studies: STEM can be used in conjunction with specialized holders that allow the sample to be heated, cooled, or exposed to gases or liquids. This enables real-time observation of catalyst behavior under reaction conditions, providing insights into catalytic mechanisms. Defect Analysis: STEM is sensitive to structural defects, such as dislocations, vacancies, and grain boundaries, which can significantly affect catalytic performance. By identifying and analyzing these defects, researchers can tailor catalyst properties for improved efficiency.
