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Heterogeneous gas-solid catalyst reactions occur on the atomic scale and there is increasing evidence single atoms and very small clusters can act as primary active sites in chemical reactions. Aberration corrected environmental scanning transmission electron microscope (AC ESTEM) has been developed for novel studies of nanoparticle catalysts with Angstrom (0.1 nm) resolution in gas. It extends high vacuum analyses with full analytical facilities and unrestricted high angle annular dark field (HAADF) imaging of single atoms, small clusters and nanoparticles in dynamic in-situ experiments with controlled gas reaction environments at initial operating temperatures up to > 500 °C.