Abstract
Kinetics of thiophene reactive adsorption on Ni/SiO 2 and Ni/ZnO was studied by thermal gravimetric analysis at 280–360 °C under 5–40 mbar of thiophene in H 2. In the case of Ni/SiO 2 the interaction proceeds in two steps: a rapid surface reaction is followed by a slower bulk transformation into Ni 3S 2. Maximum Ni conversion depends on reaction conditions and observed conversion profiles can be described by an exponential equation corresponding to a reaction of first order relatively to both sulfidable Ni amount and thiophene. The interaction between Ni/ZnO and thiophene proceeds in a rather different manner. A rapid increase of weight, similar to the first stage observed on Ni/SiO 2, is not followed by bulk Ni sulfidation, but instead by a nucleation-controlled ZnO surface transformation. After formation of the surface ZnS layer, a complete particles sulfidation occurs with kinetics being strongly dependent on the reaction conditions possibly due to comparable rates of different reaction steps.
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