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以活性氧化铝(γ-Al2O3)为载体,分别以Mn(NO3)2溶液和酸性氯化钯(PdCl2)溶液为修饰组分和活性组分前体,采用分步浸渍法制备了Mn修饰Al2O3载体负载钯催化剂。将催化剂应用于蒽醌加氢反应,考察了催化剂制备方法、活性组分负载量和催化剂还原温度对反应效果的影响。用XRD、BET、XPS和TPR对催化剂进行了表征。结果表明,催化剂活性受到制备方法的影响,在对Mn修饰Al2O3载体进行焙烧,Pd负载量0.2(wt)%、还原温度300℃的条件下,催化剂蒽醌加氢活性较高,较未修饰的催化剂提高了约16%。催化剂中Mn以MnO的形式存在,影响了γ-Al2O3的组织结构,使载体与活性组分之间的作用力增强,活性组分Pd高度分散在催化剂表面,从而提高了催化剂的活性。
Using Mn (NO3) 2 solution and PdCl2 solution as the modified components and active component precursors on activated alumina (γ-Al2O3) as support, Mn-modified Al2O3 The supported palladium catalyst. The catalyst was applied to the hydrogenation of anthraquinone. The effects of preparation methods, loading of active components and catalyst reduction temperature on the reaction were investigated. The catalysts were characterized by XRD, BET, XPS and TPR. The results showed that the catalyst activity was affected by the preparation method. Under the conditions of calcination of Mn-modified Al2O3 support, Pd loading of 0.2 wt% and reduction temperature of 300 ℃, the activity of anthraquinone hydrogenation was higher than that of the unmodified The catalyst increased by about 16%. The Mn in the catalyst exists in the form of MnO, which affects the structure of γ-Al2O3, increases the force between the carrier and the active component, and disperses the active component Pd highly on the catalyst surface, thereby increasing the activity of the catalyst.