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Heterogeneous gas and solid catalyst reactions occur at the atomic level, andunderstanding and controlling complex catalytic reactions at this level iscrucial for the development of improved processes and materials. There arepostulations that single atoms and very small clusters can act as primaryactive sites in chemical reactions. Early applications of our novel aberrationcorrected (AC) environmental scanning transmission electron microscope (ESTEM)with single atom resolution are described. This instrument combines, for thefirst time, controlled operating temperatures and a continuous gas environmentaround the sample with full AC STEM capabilities for real-time in-situ analysisand visualization of single atoms and clusters in nano particle catalysis.ESTEM imaging and analysis in controlled gas and temperature environments canprovide unique insights into catalytic reaction pathways that may involvemetastable intermediate states. Benefits include new knowledge and moreenvironmentally friendly technological processes for health care and renewableenergy as well as improved or replacement mainstream technologies in thechemical and energy industries.

Visualizing reacting single atoms in chemical reactions, advancing the frontiers of materials research