Abstract: Embodiments of the present disclosure may include a tray separating apparatus that may include a main body having an accommodating part extending in a first direction. Additionally, the present disclosure may include a tray inlet located at a top of the main body. Additionally, embodiments may include a tray outlet that may be located at a side of the main body and a first transmission part that may be located at the bottom of the accommodating part. Embodiments may additionally include a first limiting part, mounted on the main body, where the first limiting part may be configured to switch between a first position and a second position; and a second limiting part may be located below the first limiting part in the first direction and where the second limiting part may be configured to switch between a third position and a fourth position.

Abstract: A catalyst for hydrodemetalization of heavy oil, especially residuum oil, and a process for preparing the same, wherein said catalyst comprises the metal elements of Groups VIII and/or VIB as active components supported on an alumina carrier having large pores. The total pore volume of said carrier is in the range of 0.80˜1.20 ml/g (by mercury porosimetry method), the specific surface area in the range of 110˜200 m2/g, the peak pore diameter in the range of 15˜20 nm, and the bulk density in the range of 0.50˜0.60 g/ml. In the process of the invention, a physical pore-enlarging agent and a chemical pore-enlarging agent are added simultaneously during the mixing of the pseudoboehmite to a plastic mass, then extruding, drying, calcining, the carrier is obtained, then impregnating with active components by spraying onto the carrier, after drying and calcining, the catalyst is obtained.