Hydrogenolysis Of Glycerol To Propandiols Over Cu-Pt Bimetal Catalysts

The declining reserves of natural gas and petroleum and environmental problems caused by the using drives people to find environmentally friendly and renewable energy sources. Along with the use and development of biodiesel, fossil energy will be superseded. And the development of biodiesel will caused the surplus glycerol. Hydrogenolysis of glycerol to 1,2-propandiol reuse the growing supply of glycerol and improve the economic efficiency. In this paper, we use Cu-based bimetallic catalysts to hydrogenolysis of glycerol to 1,2-propandiol and the research results as bellowing:1, We prepared a series of Cu bimetallic catalysts over different carrier to investigate for hydrogenolysis of glycerol to 1,2-propanediol and the results shown SiO2 can improve the dispersibility to promote catalystic performance.2, A series of bimetallic Cu catalysts (Cu-Pt/SiO2, Cu-Pd/SiO2, Cu-Ag/SiO2, Cu-Ni/SiO2) were prepared, then investigated for hydrogenolysis of glycerol to 1,2-propanediol. It is worth noting that Cu-Pt/SiO2 presented the highest activity with a 96% selectivity to 1,2-PDO and a nearly 100% conversion of glycerol at 473 K,4 MPa initial H2 pressure,12 h, which is much higher activity than monometallic Cu/SiO2. We furthered the study and found that Cu-Pt/SiO2 got the smallest particle size and greatest dispersion. Besides, it was found that Pt promoted reduction of Cu2+.3, Compared with other Cu-Pt molar ratio, Cu-Pt/SiO2 (1:0.2) was the preferable catalyst for hydrogenolysis of glycerol to 1,2-PDO.4, The used Cu-Pt/SiO2 catalyst maintained the high activity with over 90% conversion of glycerol and selectivity to 1,2-PDO and does not require a reduction pretreatment when it was reused.