摘要
对7.5%Ni/(κ+θ+α)-Al2O3催化剂进行预硫化处理,研究硫化液种类和浓度、硫化度、硫化温度等因素对催化性能的影响,旨在保证催化剂加氢活性的同时,提高催化剂对单烯烃的选择性。通过对硫化条件进行优化,使单烯选择性从0增加至93%。通过对CS2催化剂中毒机理的考察发现,CS2在低温下极易使催化剂失活。导致催化剂失活的因素有2个:其一是低温下CS2与催化剂活性中心反应形成金属硫化物;其二是CS2在催化剂表面的物理吸附。
Nickel based catalyst 7.5% Ni/（ K ＋ θ ＋ α） -Al2O3 is studied by presulfidation treatment. The influences of sulfides, sulfidity, presulfidation temperature and concentration of sulfide on catalytic performance in selective hydrogenation of isoprene are studied, which aims to improve the mono-olefins selectivity with minimal loss of hydrogenation activity. The selectivity of mono-olefins can be greatly improved （from 0 to 93% ） in the optimum conditions. By the discussion of poisoning mechanism with CS2,it is found that CS2 can easily deactivate the catalyst at low temperature. The metal sulfide formation and CS2 physical adsorption on the catalyst surface lead to catalyst deactivation.
出处
《现代化工》
CAS
CSCD
北大核心
2014年第1期111-114,116,共5页
Modern Chemical Industry
基金
国家重点基础研究发展计划"973"计划(2012CB215005)
关键词
预硫化
镍基
催化剂
选择加氢
二烯
presulfidation
nickel based
catalyst
selective hydrogenation
diene
