Four types of forming devices (twin-system screw extruder, single screw extruder, piston extruder, disc granulator) and four sorts of peptizing solutions (some of them with sugar as pore regulating agents) were applied to prepare alumina supports. Aluminum hydroxide was mixed with peptizing agents, kneaded, formed, dried and calcined at 773 K. The used forming devices as well as the sugar and nitric acid containing peptizing solutions were shown to enable the preparation of bimodal aluminas with various pore structures. The pore structure of these supports typically had a first dominating pore radius in the range 3-5 nm, a second one in the range 20-1250 nm and a macropore volume from 0.1 up to ca. 1 dm3kg. It was evidenced that the calcination temperature does not influence the structure of the macropores. © 1994.
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