The forming of catalyst supports is a crucial step in the application of industrial catalysts. Alumina, a widely employed catalyst support, is often shaped using nitric acid as a peptizer to enhance mechanical strength. However, the use of large amounts of nitric acid typically results in a decrease in specific surface area and damage to the pore structure due to chemical corrosion. In this work, we present a more practical approach that is pre-filling the open pores of pseudo-boehmite powder with water instead of directly filling them with nitric acid solution. The binder with a small quantity of nitric acid plays a synergistic role in functioning as a glue on the particle surfaces. And through this method, high-strength (231 N cm) alumina support can be prepared more efficiently through extrusion. Besides, the pore structure of the extrudates was characterized by multi-scale methods, including nitrogen physical sorption and XRM (X-ray microscopy), which revealed abundant interconnected hierarchical pores deriving from the pre-wetting shaping process. This proposed approach enables the attainment of high mechanical strength and interconnected porosity for alumina extrudates with less use of acid, which holds a significant practical application value.

中文翻译：

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通过预润湿方法增强界面协同作用以制备高机械强度和连通孔隙率的氧化铝挤出物

催化剂载体的形成是工业催化剂应用的关键步骤。氧化铝是一种广泛使用的催化剂载体，通常使用硝酸作为胶溶剂来成型以增强机械强度。然而，使用大量硝酸通常会导致比表面积下降，并因化学腐蚀而损坏孔结构。在这项工作中，我们提出了一种更实用的方法，即用水预先填充拟薄水铝石粉末的开孔，而不是直接用硝酸溶液填充它们。含有少量硝酸的粘合剂在颗粒表面起到胶合的协同作用。并且通过该方法，可以通过挤出更有效地制备高强度（231 N·cm）氧化铝载体。此外，通过多尺度方法对挤出物的孔结构进行了表征，包括氮物理吸附和 XRM（X 射线显微镜），揭示了预润湿成型过程中产生的丰富的互连分层孔。该方法能够在较少使用酸的情况下实现氧化铝挤出物的高机械强度和互连孔隙率，具有显着的实际应用价值。