An industrial perspective of the impact of Haldor Topsøe on (in situ) electron microscopy in catalysis

•Electron microscopy advances in catalysis research at Haldor Topsoe A/S are outlined.•Atomic-scale visualization of surface structures and reactivity in catalysis.•New insight into dynamic properties and functionality in catalysis.

With recent advances, electron microscopy can now visualize heterogeneous catalysts at the atomic scale and under catalytic meaningful conditions. A selection of the advancements is outlined to reflect Dr. Haldor Topsøe’s enthusiasm for electron microscopy as means for improving the fundamental understanding in catalysis.

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