Identification of the adsorption mode of thiophene on sulfided Mo catalysts

Article Abstract:

The adsorption and reactions of thiophene on sulfided Mo/Al2O3 catalysts were investigated over wide ranges of pressure and temperature using infrared spectroscopy and temperature-programmed desorption. Thiophene was observed to become reactive on the catalysts only in the presence of gas-phase hydrogen and at high temperatures. Temperature-programmed desorption in ultrahigh vacuum following heating of a sulfided 9.4 wt % Mo/Al2O3 catalyst to 693 K in a thiophene/H2 mixture results in desorption of C4 hydrocarbons, H2S and H2 from the catalyst surface.

Research, Catalysts, Organosulfur compounds, Organic sulfur compounds, Thiols, Molybdenum disulfide

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Infrared spectroscopic investigation of thiophene adsorption on silica-supported nickel phosphide catalysts

Article Abstract:

The surface chemistry of thiophene on reduced and sulfided Ni/SiO2 and Ni2P/SiO2 catalysts is investigated by using infrared (IR) spectroscopy. The increased reactivity of thiophene on Ni2P/SiO2 catalysts in UHV may explain the high turnover frequency previously reported for Ni2P/SiO2 catalysts relative to sulfided Ni/SiO, Mo/SiO2, and Ni-Mo/SiO2 catalysts.

Surface chemistry, Thiophene

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Reflection absorption infrared spectroscopy and temperature-programmed desorption studies of the adsorption and desorption of amorphous and crystalline water on a graphite surface

Article Abstract:

Reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) are used to perform a detailed investigation of the adsorption of water on highly oriented pyrolytic graphite (HOPG) at 90 K. Isothermal TPD studies are also done and it is observed that the desorption of water does not obey perfect zero-order kinetics.

Water, Graphite

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