Abstract:

Using γ-Al2O3 as a support, a multiple-metal （Ni-Cu-Mn-K/Al2O3）catalyst for high- temperature water gas shift reaction was prepared by an equivalent-volumetric two-step impregnation method.Preparation parameters and reduction conditions were determined by TG, DTA and TPR characterization techniques.The results showed that, when loading ratio (Ni∶Cu∶Mn), impregnation time, and calcination temperature were 2∶1.5∶1, 300 min and 400℃ for the first-step impregnation respectively, loading of K+ was 5% in the second step impregnation, and reduction temperature was 400℃ and a proper amount of steam was added, the catalyst prepared in this work showed excellent catalytic performance and thermal stability, as compared with the existing commercial catalysts.Meanwhile, the ammonium-nitrogen wastewater produced with conventional preparation methods was eliminated with the eqivalent-volumetic impregnation method proposed in this work.

Key words:

水煤气变换催化剂, 多元体金属组分;等体积浸渍法;制备参数;还原条件

摘要：

以γ-Al2O3为载体，采用二步等体积浸渍法，制备了多元体高温水煤气变换催化剂。采用活性表征、TG、DTA和TPR等方法，考察了制备参数和还原条件对催化剂的影响。结果表明：第一步浸渍时间为300 min时达到浸渍平衡;第一步浸渍组分(Ni∶Cu∶Mn)配比2∶1.5∶1、第二步K+的加入量为5%、焙烧温度400℃时制得的催化剂具有高活性;还原最高温度为400℃，还原过程添加适量的水蒸气时，催化剂具有良好的催化性能和热稳定性能。催化性能优于国内外现有工业产品。而且还消除了传统的共沉淀法制备工艺产生的大量氨氮废水。

关键词:

水煤气变换催化剂, 多元体金属组分;等体积浸渍法;制备参数;还原条件