Ce促进Ni/SAPO-11催化剂上正庚烷的临氢异构化  

Ni/SAPO-11 Promoted by Rare Earth Element Ce for Hydroisomerization of n-Heptane

作　　者：所艳华[1,2] 李秀敏[3] 陈刚[1] 崔莹雪[2] 孙羽佳[2] 汪颖军[2] 

机构地区：[1]哈尔滨工业大学化学系,哈尔滨150001 [2]东北石油大学化学化工学院,大庆163318 [3]塔里木大学生命科学学院,阿拉尔843300

出　　处：《高等学校化学学报》2014年第6期1252-1257,共6页Chemical Journal of Chinese Universities

基　　金：黑龙江省教育厅科技项目(批准号:12521063)资助~~

摘　　要：通过浸渍法制备了Ni/SAPO-11催化剂,并进一步通过分步浸渍法制备了Ni-Ce/SAPO-11双金属催化剂,对其晶相结构和表面酸性进行了表征.实验结果表明,Ce的引入导致比表面积和孔容增大,总酸量升高而酸强度降低,金属Ni在载体SAPO-11表面的分散度提高.通过对正庚烷的临氢异构化反应研究发现,引入Ce可以显著提高异庚烷的选择性.在n(H2)/n(n-C7H16)=12,MHSV=3.52 h-1,催化剂量0.3 g,反应温度300℃条件下,Ni-2%Ce/SAPO-11催化剂的正庚烷转化率可达25.4%,异庚烷的选择性可达90.4%.The monometallic catalyst Ni/ SAPO-11 was prepared via the impregnation method. Then, the bi-metallic catalyst Ni-Ce / SAPO-11 was prepared via the sequential impregnation method. The crystal structure and acidity of these two catalysts were determined by X-ray powder diffraction, Brunauer-Emmett-Teller （BET） methods and temperature-programmed desorption of ammonia. With addition of Ce, the BET surface areas and porous volume of Ni/ SAPO-11 and total acidity were increased, and the acid strength was de-creased. Introduction of Ce improved the dispersion of Ni on the surface of SAPO-11. Addition of Ce could improve the selectivity of the hydroisomerization of n-heptane considerably. Under the conditions of n（H2 ） /n（n-C7 H16 ）= 12, weight hourly space velocity =3. 52 h-1 , catalyst weight=0. 3 g, and the reaction tempera-ture of 300 ℃, the conversion of n-heptane could reach 25. 4% and the isomerization selectivity to i-heptane could reach 90. 4% .

关 键 词：SAPO-11分子筛 Ni-Ce SAPO-11催化剂 铈 镍 正庚烷 异构化 

分 类 号：O643.3[理学—物理化学]