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为提高Pt-Sn催化剂对乙酸加氢制乙醇反应的活性及选择性,以Al_2O_3-CaSiO_3为载体,采用浸渍法制备不同Pt和Sn质量分数的乙酸加氢催化剂,对催化剂的物性结构和形貌进行了表征,并考察了其在乙酸加氢制乙醇反应中的性能。结果表明,Pt和Sn质量分数都为1%的催化剂,载体的晶相结构无变化,表面特征较好,具有最好的反应活性及乙醇选择性。在反应温度为275℃,压力为3 MPa,液体质量空速为0.66 h-1,氢气与乙酸摩尔比n(H2)/n(HOAc)=10的条件下,乙酸的转化率达73%,乙醇的选择性达70%。
In order to improve the activity and selectivity of the Pt-Sn catalyst for the hydrogenation of acetic acid to ethanol, the hydrogenation catalyst for acetic acid was prepared by impregnation method using Al 2 O 3 -CaSiO 3 as support. The physical properties and morphology of the catalyst Were characterized, and investigated its performance in the hydrogenation of acetic acid to ethanol. The results show that the Pt and Sn mass fraction of 1% of the catalyst, no change in the crystal structure of the carrier, the surface characteristics of the better, with the best reactivity and ethanol selectivity. The conversion of acetic acid reached 73% at a reaction temperature of 275 ℃, a pressure of 3 MPa, a liquid mass space velocity of 0.66 h-1 and a molar ratio of hydrogen to acetic acid of n (H2) / n (HOAc) = 10. Ethanol selectivity up to 70%.