THE REACTIVITY OF SULFUR-CONTAINING MOLECULES ON NOBLE-METAL SURFACES .3. ETHANETHIOL ON AU(110) AND AG(110)

[摘要] The adsorption of ethanethiol on clean and partially sulfided Au(110) and Ag(110) surfaces has been investigated using temperature programmed reaction spectroscopy. In all cases a portion of the adsorbed ethanethiol undergoes S-H bond cleavage below 350 K to form ethyl thiolate; H-2 and H2S are evolved between 150 and 350 K. Ethyl thiolate decomposes above 400 K on Ag(110) to yield ethylene, together with ethane and some dihydrogen. On Au(110) ethyl thiolate decomposes in the same temperature range to evolve a mixture of ethylene, ethane, ethanethiol and diethyl sulfide. The evolution of sulfur-containing molecules from thiolate decomposition is novel and appears to be unique to gold. On both surfaces the decomposition kinetics are dependent on surface sulfur coverage.

[发布日期] 1994-05-10