A copper chromite hydrogenation catalyst of enhanced activity is obtained by an ante-pre-reduction treatment in which a copper chromite catalyst precursor is soaked in a reducing atmosphere at temperatures below a pre-reduction temperature (typically about 140°C) at which appreciable pre-reduction of the catalyst can be detected. This catalyst is characterised by particles of reduced copper substantially all of which have an average particle size of less than about 300 x 10⁻¹⁰m (300Å), which have an average particle size of less than about 100 x 10⁻¹⁰m (100Å), and which are substantially uniformly distributed on a chromium-containing support. Typically such catalysts exhibit a copper surface area of about 18.5 m²/g as determined by N₂O decomposition at 20°C, compared to a corresponding copper surface area of 4.5 m²/g for a catalyst which has been produced by conventional pre-reduction of the same catalyst precursor.
一种活性增强的
铜铬铁矿加氢催化剂是通过预还原处理获得的,在预还原处理中,
铜铬铁矿催化剂前驱体被浸泡在还原气氛中,温度低于可检测到催化剂明显预还原的预还原温度(通常约 140°C)。这种催化剂的特点是,还原
铜颗粒的平均粒径基本上都小于约 300 x 10-¹⁰m (300Å),平均粒径小于约 100 x 10-¹⁰m (100Å),并且基本上均匀地分布在含
铬的载体上。通常情况下,这种催化剂的
铜表面积约为 18.5 m²/g(在 20°C 下通过 N₂O 分解测定),而通过对相同催化剂前驱体进行常规预还原制得的催化剂的相应
铜表面积为 4.5 m²/g。