Abstract: Pseudo-boehmite was prepared by the NaAlO₂-Al(SO₄)₃ method, the grain size of the pseudo-boehmite was adjusted by controlling the aging time of the pseudo-boehmite, and four carriers with different pore structures were obtained with the same specific surface area, pore volume and pore size, but the pore size distribution was different. Pyrene was used as a model compound to investigate the hydrogenation saturation properties of the catalysts prepared by these four carriers on a high-pressure microreaction device. BET, XRD, XPS, TEM and GC-MS were used to characterize the pseudo-boehmite, support and catalyst. The results showed that with the increase of aging time, the crystallinity and grain size of the pseudo-boehmite increased, the specific surface, pore volume and maximum pore size of the support were similar, the pore size distribution concentration increased, the number of total hydroxyl groups on the surface and the proportion of basic hydroxyl groups decreased gradually, the interaction force between the oxidized metal and the support decreased, and the sulfidation degree of the catalyst and the proportion of class Ⅱ multilayer active phases increased after sulfidation. The hydrogenation evaluation results of pyrene displayed that the hydrogenation conversion rate of pyrene increased with the increase of the concentration of carrier pore size distribution. The results also indicated that the increase of sulfidation degree and the proportion of type Ⅱ active phase was conducive to improving the hydrogenation performance of the catalyst. With the increase of the concentration of pore size distribution, the effective specific surface of the 8-10 nm pores was obviously increased, which was more conducive to the molecules diffusion into the pores to contact active site.

Key words: pseudo-boehmite, aging time, hydrogenation, concentration of pore size distribution, pyrene