Abstract
The regeneration of a Ni/SiO 2 catalyst that was completely poisoned by thiophene during the benzene hydrogenation was studied. The regeneration treatments consisted of a sequence of oxydation-reduction treatments using low oxygen partial pressure mixtures and pure hydrogen, with intermediate argon stream purging at the same treatment temperature. The influence of treatment time, oxygen partial pressure, number of cycles and treatment temperature on the sulphur removal and recovering of both hydrogenation activity and metallic surface area was studied. This new method is easy to carry out and quick, allowing to remove up to 90% of the sulphur of the completely deactivated catalyst. Non-equilib- rium states between oxydation and reduction steps seem to be responsible for sulphur removal. The regeneration efficiency reached in a particular treatment depended on the balance between two opposite effects: the sulphur and the active phase sintering.
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