Propylene on Pt(111)

Ethylene adsorption on Pd( 111 ) studied using infrared reflection–absorption spectroscopy

“…It may, however, adsorb due to an interaction between ethylene and a polarized chemisorbed species which may cause it to bond more strongly. From previous molecular beam results, weakly adsorbed ethylene has been suggested to be present on top of an ethylenesaturated Pt(1 1 1) surface [20] and the presence of second-layer propylene on Pt(1 1 1), identified spectroscopically, has recently been reported [21]. If this is the case, similar ethylenic species should be observed on other chemisorbed overlayers.…”

Direct Observation of Surface Ethyl to Ethane Interconversion upon C2H4 Hydrogenation over Pt/Al2O3 Catalyst by Time-Resolved FT-IR Spectroscopy

“…30 The growth of the two ethane bands is identical within uncertainties, with a 1/e rise time of 144 ± 14 ms. The C 2 H 6 product also absorbs at 2880 cm -1 (P branch of v 8 +v 11 ), but this band is overlapped by surface ethyl absorption in the initial time slices. Ethylidyne is also known to absorb at 2880 cm -1 .…”

“…9,10 Various experimental studies have provided convincing evidence that the hydrogenation step (1) involves π-C 2 H 4 species. [11][12][13][14][15][16] Using sum frequency generation spectroscopy (SFG) for monitoring the CH stretching region, Somorjai and coworkers have identified absorption bands of π-bonded ethylene over Pt(111) under high pressure conditions at room temperature and demonstrated that it is the species being hydrogenated. 1b, 15 The same 4 4 study revealed peaks assigned to surface ethyl species, hydrogenation of which was proposed to constitute the main reaction path.…”

Adsorption and reaction of cyclohexene and 1-hexene on nascent gold surface formed by friction

“…In general, olefin and benzene molecules chemisorb on metal surfaces by donation of their p-electrons. Olefin molecules adsorb with the saturated hydrocarbon group curving up from surface [18,19], and benzene molecules adsorb with the ring lying flat on surface [20,21]. That is to say, benzene molecule needs more area than cyclohexene and 1-hexene to adsorb on the surface.…”