Pt/Nd_2O_3-WO_3/ZrO_2催化甘油氢解制1,3-丙二醇

Hydrogenolysis of glycerol over Pt/Nd_2O_3-WO_3/ZrO_2 catalysts for 1,3-propanediol

制备不同Nd2O3质量分数的2%Pt/Nd2O3-WO3/ZrO2催化剂。通过N2物理吸附,NH3程序升温脱附(NH3-TPD)、H2程序升温脱附(H2-TPD)、CO脉冲吸附等方法表征催化剂的物理化学性质。用固定床连续流动反应器考察催化剂对甘油氢解制1,3-丙二醇反应的催化性能。结果表明,引入Nd2O3提高了催化剂的H2吸附量,进而提高了催化剂的催化活性;焙烧温度对催化剂性能有重要影响。在4 MPa、130℃、质量分数为60%甘油水溶液进料、液体体积空速(LHSV)0.25 h-1反应条件下,2%Pt/0.25NdWZ(700,450)催化剂催化甘油氢解反应,甘油转化率为75.2%,1,3-丙二醇产率达28.9%,产物中n(1,3-丙二醇)/n(1,2-丙二醇)达到21.9。

A series of 2% Pt/Nd2O3-WOa/ZrO2 catalysts with different Nd2O3contents were prepared. The physico-chemical properties of catalysts were characterized by the techniques of N2 physical adsorption, NH3 temperature-programmed desorption （NH3-TPD）, HE temperature-programmed desorption （H2- TPD） and CO-pulse adsorption. Hydrogenolysis of glycerol in aqueous medium over these catalysts was performed in a fixed-bed continuous-flow reactor. The results showed that the capacity of hydrogen adsorption and catalytic performance of the catalysts were dramatically improved by addition of Nd2 O3. The calcination temperature had a great effect on the physico-chemical properties and the catalytic performances of the catalysts. Under the reaction conditions of 13O ℃, 4 MPa, 6O% （ mass ratio） glycerol aqueous solution as feed and liquid space velocity （LHSV） of O. 25 h-1, 75.2% conversion of glycerol, 28.9% yield of 1,3- propanediol, and 1,3-propanediol/1,2-propanediol mole ratio up to 21.9 were ob- tained over 2% Pt/0. 25NdWZ（700,450） catalyst.