Sulfidation of nickel- and cobalt-promoted molybdenum–alumina catalysts using a radioisotope 35S-labeled H2S pulse tracer method

摘要: Abstract The sulfidation state in a series of nickel- and cobalt-promoted Mo/Al 2 O 3 catalysts was investigated using 35 S radioisotope pulse tracer methods (RPTM). Several pulses -labeled H ([ ]H S) were introduced into nitrogen stream until the radioactivity recovered approached pulse. From amount [ introduced, sulfur accumulated on catalyst estimated. amounts increased with increasing temperature for all showed features similar to those nickel-promoted catalysts. It found that sulfided states close stoichiometric states, where Ni, Co Mo are present as NiS, 9 8 MoS , attained at 400°C Moreover, it suggested only molybdenum below 300°C; nickel oxide cobalt Ni– or Co–Mo/Al is more difficult lower temperatures species occurs higher (above 300°C).