Co-B非晶态合金催化剂用于乳酸乙酯液相加氢制1,2-丙二醇

Catalytic Hydrogenation of Ethyl Lactate to Prepare 1,2-Propanediol over Co-B Amorphous Alloy Catalyst

该文采用化学还原法,通过改变前驱体醋酸钴溶液的浓度制备出一系列非晶态合金Co-B催化剂,并以乳酸乙酯液相加氢合成1,2-丙二醇为探针反应考察了催化剂的性能,同时研究了反应条件对乳酸乙酯液相加氢性能的影响。采用物理吸附(BET)、X射线衍射(XRD)和透射电镜(TEM)对催化剂的结构和性质进行了表征。结果表明,前驱体醋酸钴溶液的浓度对催化剂的结构和性能有重要的影响。XRD结果表明,制备的催化剂具有非晶态结构,在前驱体醋酸钴溶液的浓度为0.75 mol/L时,催化剂具有较好的热稳定性。BET结果表明,非晶态Co-B催化剂具有中孔结构。最适的反应条件为:反应温度160℃、氢气压力6 MPa、反应时间9 h、催化剂用量为0.2 g,在该条件下,乳酸乙酯转化率98.53%,1,2-丙二醇的收率98.32%。

By the chemical reduction method, a series of Co-B catalysts were prepared by changing the concentration of the cobalt acetate precursor and used for liquid hydrogenation of ethyl lactate to prepare l, 2-propanediol. The reaction conditions were discussed. The as-prepared catalysts were characterized by means of physical adsorption（BET） , X-ray powder diffraction（XRD） and transmission electron microscope （TEM）. The XRD results indicate that all of the fresh catalysts showed an amorphous structure, and the catalyst with the concentration of 0. 75 moL/L of the cobalt acetate precursor solution had the best thermal stability. The BET results show that all of the catalysts were of mesoporous structure. The conversion of ethyl lactate was up to 98.53% , and the yield of 1,2- propanediol was 98.32% under the optimum conditions of 160 ~C and H2 pressure 6 MPa for 9 h.