甘油氢解制低级醇用PtPdNi/TiV_xAlO_y催化剂的研究

PtPdNi/TiV_xAlO_y Catalyst for Glycerol Hydrogenolysis to Lower Alcohols

分别采用分步浸渍法和共浸渍法制备了PtPdNi/TiVxAlOy催化剂,并考察了该催化剂在甘油氢解反应中的催化性能;采用XRD、H2-TPR、H2-O2滴定和NH3-TPD等手段对PtPdNi/TiVxAlOy催化剂和TiVxAlOy载体进行了表征。实验结果表明,采用分步浸渍法制备催化剂以及在载体中引入适量V均有利于提高Pt和Pd在载体表面的分散度,从而提高催化剂在甘油氢解反应中的催化性能;高度分散的Pt和Pd是催化剂的主催化活性中心,Ni起助催化作用,可抑制Pt和Pd与载体之间的相互作用,有利于Pt和Pd在载体表面分散;引入适量V可提高TiVxAlOy载体的酸强度,载体表面适量强酸位的存在有利用于低级醇的生成。

PtPdNi/TiVxAlOy catalysts were prepared by co-impregnation or two-step impregnation. Their catalytic performances in glycerol hydrogenolysis were studied. The PtPdNi/TiVxAlOy catalysts and TiVxAlOy supporters were characterized by means of XRD, H2-TPR, H2-O2 titration and NH3-which could weaken the mutual action between Pt and Pd to heighten the dispersity of Pt and Pd on the supports. Adding appropriate amount of V could increase the acid strength of the supports, which was beneficial to production of lower alcohols in glycerol hydrogenolysis.