【摘要】 制备了以γ-Al2O3为载体的Ni基选择性加氢硫转移催化剂Mo-Ni/γ-Al2O3,并用于催化裂化(FCC)汽油的加氢硫转移反应。对比了预硫化型和氧化型Mo-Ni/γ-Al2O3催化剂的活性和选择性,并考察了无氧焙烧温度、活性组分负载量对预硫化型Mo-Ni/γ-Al2O3催化剂加氢硫转移催化性能的影响。采用模型化合物研究了硫醇在MoNi/γ-Al2O3催化下的反应,考察了烯烃和硫醇对硫转移反应的影响。结果表明,无氧焙烧温度400℃下制备得到的w(NiO)=8.2%、w(MoS2)=5.6%的预硫化型Mo-Ni/γ-Al2O3催化剂具有相对较高的加氢硫转移反应催化活性和选择性;硫醇与烯烃的反应在催化剂表面的加氢活性位上进行,硫醇先加氢脱硫,生成吸附态H2S,吸附态H2S再与吸附的烯烃反应生成大分子硫醇或硫醚,达到硫转移的目的。更多还原

【Abstract】 The bimetal Ni-based selective hydrogenation catalysts for sulfur transfer supported onγ-Al2O3 were prepared,and used to the selective hydrogenation of FCC gasoline.The catalytic activity and selectivity of the presulfided Mo-Ni/γ-Al2O3 catalyst were compared with oxidation Mo-Ni/γ-Al2O3 catalyst.The effects of calcination temperature,contents of Ni and Mo on the sulfur transfer performance of the presulfided Mo-Ni/γ-Al2O3 catalyst were investigated.Furthermore,the influences of olefin and mercaptan for sulfur transfer were studied by the reaction of model mercaptan and olefin over Mo-Ni/γ-Al2O3 catalyst.Experimental results showed that when optimum preparation conditions were selected(the anaerobic calcination temperature was 400℃,the mass fraction of NiO was 8.2% and MoS2 was 5.6%),the catalytic activity and selectivity of the presulfided Mo-Ni/γ-Al2O3 catalyst were relatively superior in the selective hydrogenation of FCC gasoline for sulfur transfer.The reaction of thiol and olefin happened on the active sites of hydrogenation on the surface of Mo-Ni/γ-Al2O3 catalyst.Hydrodesulfurization of thiol firstly produced adsorbed H2S,which then reacted with adsorbed olefin and formed macromolecular thiol or thioether.更多还原