Reaction of ethanethiol on clean and carbon-modified Mo(110) surfaces as a function of sulfur coverage

Pyridine adsorption and reaction on Mo(110) and C/N–Mo(110): experiment and modeling

“…6) suggests the surface carbon forms a carbidic surface, similar to the features observed for prepared Mo(1 1 0) carbide surfaces [44,45]. LEED patterns of the contaminated surface indicated (1 · 1) hexagonal periodicity with a slight broadening of the spots, and did not suggest an ordered carbidic surface structure, such as a p(4 · 4) molybdenum carbide surface [35,[46][47][48]. These ordered carbidic surfaces often demonstrate higher catalytic activities; however, the increase in pyridine molecular desorption in the subsequent TPD experiments indicates the C/N-Mo(1 1 0) surface is less active for pyridine decomposition.…”

“…From their studies of hydrocarbons on carbon-modified Mo(1 1 0) surfaces, they observed that carbidic carbon produces changes in surface chemistry and graphitic carbon has no effect other than to reduce reactivity. In a series of studies to understand the effect of carbidic overlayers on Mo(1 1 0), Roe and Schulz reported carbidic overlays do not alter the reactivity of ethanethiol [35], while 1,2-ethanedithiol [35] showed clear changes in selectivity and reaction pathways on both defective and p(4 · 4)-C/Mo(1 1 0) surfaces compared to Mo(1 1 0). They also noted a shift to lower desorption temperatures on carbided Mo(1 1 0) indicating a lowering of the activation energy.…”

“…The sample was resistively heated using a Hewlet Packard 6672A DC programmable power supply, and sample cooling was achieved by placing the manipulator feedthrough in direct contact with liquid nitrogen. This sample mounting configuration has been used in previous studies and is described in detail elsewhere [33][34][35].…”

Desulfurization-Related Surface Chemistry on Two-Dimensional Silica Films: Adsorption of Thiophene and Short-Chain Alkanes on Silicatene

“…For example, all bonds in these films are saturated according to ref , whereas wafer may have so-called dangling bonds and various functionalities. Nevertheless, thiophene and alkanes just physisorb molecularly on silica wafer. , In contrast, Mo is very reactive, e.g., ethanethiol (CH 3 CH 2 SH) dissociates on Mo single crystals as well as Mo clusters dissociate thiophene, butene dissociates on Mo(110), etc.…”

“…Nevertheless, thiophene and alkanes just physisorb molecularly on silica wafer. 25,41 In contrast, Mo is very reactive, e.g., ethanethiol (CH 3 CH 2 SH) dissociates 42 on Mo single crystals 36 as well as Mo clusters dissociate thiophene, 26 butene dissociates on Mo(110), 43 etc. So far, most studies about silicatene concern the geometrical structure of this material 7,44 as well as metal cluster deposition (model catalysts).…”