Studies of molybdena-alumina catalysts XVI. Effect of high-temperature sulfiding

摘要: Candia et. al. recently reported an increase in hydrodesulfurization (HDS) activity of CoMo/Al{sub 2}O{sub 3} catalysts sulfided at 600 C. They attributed the to a more active CoMoS phase (Type II) compared regular Type I found 400 Breysse similar effect with NiW/Al{sub catalysts. Prada Silvy al., however, no change HDS sulfiding up 700 In these studies, sintering support occurred due higher temperatures employed original calcining temperature catalyst ({approximately}500 C). The authors decided determine on and hydrogenation (HYD) Mo CoMo alumina stabilized by than that used treatments order avoid complications during sulfiding. were 400, 550, or Sulfided characterized CO{sub 2} NO chemisorption using pulse technique. At least duplicate measurements made each sample. Catalytic activities for thiophene andmore » HYD hexene carried out 350 C under atmospheric pressure fixed-bed reactor. Pseudo first-order rate constants calculated from conversions.« less