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The reaction pathways for acetylene trimerization and hydrogenation, and ethylene hydrogenation, catalyzed by palladium, are explored using a range of surface-sensitive techniques. Reflection–absorption infrared spectroscopy (RAIRS) and low-energy electron diffraction (LEED) show that ethylene is di-σ-bonded on clean Pd(111), but forms a π-bonded species on a hydrogen pre-covered surface, where the...
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