| 摘要 |
Regenerating a catalyst containing at least a metal of the group VIII and at least one metal of the VIB group deposited on a refractory oxide support, comprises: (a) at least a first step of heat treatment of the catalyst in the presence of oxygen at 350-550[deg] C; and (b) at least one second step of deposition, on the catalyst surface, of one or more additives having dicarboxylic acid structure (I). Regenerating a catalyst containing at least a metal of the group VIII and at least one metal of the VIB group deposited on a refractory oxide support, comprises: (a) at least a first step of heat treatment of the catalyst in the presence of oxygen at 350-550[deg] C; and (b) at least one second step of deposition, on the catalyst surface, of one or more additives having dicarboxylic acid structure of formula (HO-C(=O)-CR 1>=CR 2>-C(=O)-OH) (I). R 1>, R 2> : H or optionally saturated 1-30C hydrocarbon group not comprising aromatic ring and optionally containing one or more heteroatoms of O, S or N and substituted by one or more groups of -OH,-OR,-NH 2, -NHR or -NRR1a; and R, R1a : 1-4C, preferably 1-2C alkyl groups, where at least one of the groups R1 and R2 is a H, and preferably R1 and R2 are both H. Independent claims are included for: (1) the regenerated catalyst obtained by the process; and (2) use of one or more additives (I) to increase the activity of a catalyst containing at least one metal from group VIII and at least one VIB group metal deposited on a refractory oxide support. |
