Ni系碳二馏分选择加氢催化剂的制备和表征  

Preparation and Characterization of Ni Catalysts for Selective Hydrogenation of C_2 Fraction

作　　者：刘永富[1] 戴伟[2] 傅吉全[1] 彭晖[2] 刘海江[2] 

机构地区：[1]北京服装学院材料科学与工程学院,北京100029 [2]中国石油化工股份有限公司北京化工研究院,北京100013

出　　处：《石油化工》2008年第3期222-225,共4页Petrochemical Technology

摘　　要：用浸渍法和微乳液法制备了Ni含量相同的Ni/Al2O3催化剂,在固定床反应器中评价了Ni/Al2O3催化剂在碳二馏分选择加氢反应中的催化性能,采用低温N2吸附-脱附、X射线衍射、扫描电子显微镜和透射电子显微镜等方法对催化剂进行了表征。实验结果表明,在原料气组成和反应条件相同的情况下,微乳液法制备的Ni/Al2O3催化剂的活性和选择性明显高于浸渍法制备的Ni/Al2O3催化剂;微乳液法制备的Ni/Al2O3催化剂在75℃下乙炔转化率和乙烯选择性分别为96.95%和49.54%。表征结果显示,与浸渍法制备的Ni/Al2O3催化剂相比,微乳液法制备的Ni/Al2O3催化剂的活性组分粒径更小、在载体上分散更均匀,且活性组分与载体之间有相互作用。Ni,/Al2O3 catalysts with same nickel content were prepared by impregnation and microemulsion method separately, and their catalytic properties in selective hydrogenation of acetylene in C2fraction were evaluated in a fixed bed reactor. The catalysts were characterized by N2 adsorptiondesorption, XRD, SEM and TEM. Activity and selectivity of Ni/Al2O3 catalyst prepared by microemulsion method are significantly higher than those of the catalyst prepared by impregnation method when keeping composition of feed gas and reaction conditions same. At 75 ℃, conversion of acetylene and selectivity to ethylene are 96.95% and 49. 54% respectively. Catalyst prepared by microemulsion method takes advantages of smaller in active component particle size, good in dispersity of active component on support, and presence of interaction between active component and support.

关 键 词：镍催化剂 碳二馏分 乙炔 选择加氢 微乳液 

分 类 号：TQ221.21[化学工程—有机化工]