醋酸加氢Pt-Sn双金属催化剂制备乙醇研究

Hydrogenation of acetic acid to ethanol over Pt-Sn bi-metallic catalyst

采用等体积法制备了以γ-Al_2O_3为载体,CaSiO_3改性的Pt-Sn双金属催化剂,对该催化剂进行了SEM、XRD表征。并在固定床中考察了Pt负载量,CaSiO_3含量,焙烧温度以及焙烧时间对催化剂效果的影响,并对工艺条件进行了考察。结果表明:催化剂最优组成为2.5%Pt1.68%Sn3.0%CaSiO_3/γ-Al_2O_3,最佳焙烧温度为550℃,时间为6h。在反应温度为300℃、压力4.05MPa、液相空速1.726h^(-1)、气相空速3452.2h^(-1)、n(H_2)/n(HAc)=5的条件下,醋酸的转化率可达95.24%,乙醇的选择性可达73.95%。

γ-Al2O3 supported Pt-Sn bi-metallic catalysts modified by CaSiO3 were prepared by incipient-wetness impregnation method and characterized by SEM and XRD.The effects of the contents of Pt and CaSiO3,the calcination temperature and time of the catalysts and the reaction conditions on the performances of the catalysts were investigated were studied in a fixed bed reactor.The results showed that the optimal composition of the catalyst is 2.5% Pt1.68% Sn3.0% CaSiO3/γ-Al2O3,and the optimal calcination temperature and time are 550℃ and 6 h,respectively.Under the reaction conditions of 300℃,4.05 MPa,LHSV of 1.726 h-1,GHSV of3452.2 h-1 and H2/HAc molar ratio of 5,the conversion of acetic acid and the selectivity of ethanol could reach up to 95.24% and73.95%,respectively.