Fig. 1. Temperature programmed experiments show nearly complete displacement of acetate by trifluoroacetic acid on Au(110) at 300 K. (A) The characteristic products for reaction of 0.10 ML of isolated trifluoroacetate (red) decomposed to CF₃ and CO₂ at 590 K, while 0.10 ML of isolated acetate (blue) decomposed to CO₂ and CH₃ at 580 K. (B) The introduction of (i) excess trifluoroacetic acid to acetate and (ii) excess acetic acid to trifluoroacetate yields products characteristic of a majority species trifluoroacetate and a minority species acetate. The deconvolution of the CO₂ peak for acetate (blue) and trifluoroacetate (red) is determined by using a selectivity fraction on the CH₃ and CF₃ peaks. Both orders of adsorption show displacement that favors trifluoroacetate.