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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%。
In this paper, a series of amorphous alloy Co-B catalysts were prepared by the chemical reduction method by changing the concentration of the precursor cobalt acetate solution. The liquid phase hydrogenation of ethyl lactate to 1,2-propanediol was used as the probe reaction The performance of the catalyst and the influence of reaction conditions on the liquid phase hydrogenation of ethyl lactate were studied. The structure and properties of the catalyst were characterized by means of physical adsorption (BET), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the concentration of the precursor cobalt acetate solution on the catalyst structure and properties have a significant impact. The XRD results showed that the prepared catalyst has an amorphous structure. The catalyst has good thermal stability when the concentration of the precursor cobalt acetate solution is 0.75 mol / L. BET results show that the amorphous Co-B catalyst has a mesoporous structure. The optimal reaction conditions were as follows: the reaction temperature was 160 ℃, the pressure of hydrogen was 6 MPa, the reaction time was 9 h and the amount of catalyst was 0.2 g. Under this condition, the conversion of ethyl lactate was 98.53% and the yield of 1,2-propanediol was 98.32 %.