The hydrogenating treatment can enhance the mechanical properties of Mg-Li-Zn-Y-Zr-RE alloys in evidence.

The hydrogenating treatment can enhance the mechanical properties of Mg-Li-Zn-Y-Zr-LPC alloys in evidence.

Research works of this thesis aims at the light magnesium lithium alloys and mainly focuses on the effects of the misch metal and some thermal treatments such as the homogenizing treatment 、 the hydrogenating treatment etc.

To enhance the whole performances of devices,three improved technologies are introduced in the experiments,including annealing at 600℃ in the vacuum environment,the hydrogenation treatment at the hydrogen atmosphere,and the aging process for 15 hours.

The imported DN-200 hydrotreating catalyst has been applied in the 300kt/a reformer of Dagang Petrochemical Company for processing straight-run gasoline blended with 18 wt% heavy oil FCC naphtha.

The γ Al 2O 3 has larger CDA for active metal (such as Mo or W) from 5 04 to 5 82 μmol/m 2, and also has larger pore diameter, concentrated pore volume distribution and higher mechanical strength, so it can be used as a good support for hydrotreating catalysts.

The nickel distribution of residue feedstock and products obtained from fixed bed reactor were studied and focused on the effect of reaction temperature and various hydrotreating catalysts.