Ni/Al_2O_3对硫醇与异戊二烯硫醚化反应的催化性能研究

制备了硫醚化反应催化剂Ni/Al_2O_3,对其进行XRD物相分析和扫描电镜表征。在临氢条件下,通过固定床连续微型反应装置,利用模型汽油考察Ni/Al_2O_3、对硫醇与异戊二烯的硫醚化反应催化效果,同时研究了反应条件和汽油中主要组分对催化效果的影响。结果表明,当NiO负载量为15%时,Ni/Al_2O_3催化剂对二烯烃和硫醇的硫醚化反应具有较好的催化作用,对硫醇硫含量为107.4μg/g的模型汽油,在反应压力1.0MPa、反应温度80℃、体积空速2.0h~(-1)、氢油体积比为300的条件下能将油品中的硫醇硫降至1.2μg/g,脱硫醇率达到98%以上;汽油中烯烃含量对醚化反应基本没有影响,苯胺和苯酚对反应催化效果有较大的影响。

CATALYTIC PERFORMANCE OF Ni/Al2O3 CATALYST ON MERCAPTAN AND ISOPRENE THIOETHERIFATION

Ni/Al2O3 catalysts were prepared and characterized by XRD and SEM. Under the presence of H2, the catalytic performance of thioetherifying mercaptan and isoprene over Ni/Al2O3 catalyst using model FCC gasoline was studied on a continuous fixed-bed micro reaction system, as well as the effect of reaction conditions and gasoline components on the thioetherifation was investigated. Results showed that Ni/Al2O3 catalyst having a NiO loading amount of 15% exhibited good catalytic performance for thioetherifying mercaptan and diene, using a model FCC gasoline with a mercaptaneous sulfur content of 107.4 μg/g, under the conditions of a reaction pressure of 1.0 MPa, a reaction temperature of 80 ℃, a LHSV of 2.0 h-1 and a H2/oil volume ratio of 300, the mercaptaneous sulfur content of the treated oil reduced to 1.2 μg/g, reaching a mercaptan removal rate of more than 98%. The olefin content of gasoline had little effect on the thioetherifation, yet the presence of aniline and phenolic compounds had significant effect.