The poisoning of a Co(0 0 0 1) model catalyst for the Fischer–Tropsch reaction by sulfur was investigated
by in situ scanning tunneling microscopy (STM). Experiments were performed under syngas at pressures
around 10 mbar and at sample temperatures around 500 K under methanation conditions. After the reaction
experiments, the surface was analyzed by X-ray photoelectron spectroscopy. Mass spectrometry
showed that the sample was poisoned when hydrogen with