2-乙基蒽醌加氢用高性能介孔 Pd-Fe-Ba/γ-Al2 O3催化剂的制备

摘要

A mesoporous Pd-Fe-Ba/γ-Al2 O3 catalyst with significantly improved 2-ethyl anthraquinone hy-drogenation performance,in which cheap sodium aluminate and Pluronic triblock copolymer P123 were used as aluminum source and structure-directing agent,respectively,was prepared by a sol-gel method combined with an isometric impregnation method.The phase structure,microstructure and catalytic performance of the typical cat-alysts with or without addition of P123,Fe-and Ba-promoters were comparatively studied by means of TG, XRD,N2 adsorption-desorption technique,TEM and titration with KMnO4 solution.The results showed that,an appropriate addition amount of P123 could contribute to formation of the mesoporous structure and improve the catalyst performance;proper addition amount of Fe-and Ba-promoters could improve the catalytic activity and stability,respectively.The hydrogenation efficiency of the mesoporous 0.3%Pd-1.0%Fe-3.0%Ba/γ-Al2 O3 cata-lyst prepared under certain conditions could increase from 4.4 g· L-1 at 90 min to 9.6 g· L-1 at 240 min, which preliminarily indicated its potential application prospect.%以廉价的偏铝酸钠为铝源、Pluronic 三嵌段共聚物 P123为结构调节剂,采用溶胶凝胶法并结合等体积浸渍法,制备了2-乙基蒽醌加氢用高性能介孔 Pd-Fe-Ba/γ-Al2 O3催化剂,结合 TG、XRD、N2吸附-脱附和 TEM、KMnO4溶液滴定等表征和测试手段,对有无添加 P123、Fe-助剂和 Ba-助剂时所制备典型催化剂样品的物相、微结构和催化性能进行了对比研究。结果表明,在载体前驱体制备阶段添加适量的 P123有助于形成介孔结构并提高催化剂的活性；添加适量的 Fe-助剂和 Ba-助剂分别有利于提高催化剂的活性和稳定性,一定条件下所制得的介孔0.3%Pd-1.0%Fe-3.0%Ba/γ-Al2 O3催化剂的氢化效率可以从反应90 min 时的4.4 g·L-1提高到240 min 时的9.6 g·L-1,初步显示了其潜在的应用前景。