Hydrotreating process

1. A process for hydrotreating a first aromatics- and sulfur-containing hydrocarbon feed boiling in the diesel fuel range using a fresh supported CoMo catalyst, the process comprising:

treating a fresh, sulfided CoMo hydrotreating catalyst having a support of amorphous alumina, silica or alumina-silica, under first hydrotreating conditions including a temperature of about 300° C. to about 350° C., a pressure of about 1.5 MPaq to about 3.5 MPaq, and an LHSV of about 0.3 hr −1 to about 1.0 hr −1 with a second hydrocarbon feed having a lower aromatics content than said first feed, the second hydrocarbon feed having an aromatics content of less than 20 wt % to reduce the activity of the catalyst by at least 5% and, following the treatment with the second hydrocarbon feed,

hydrotreating the first feed using the treated catalyst under hydrotreating conditions including a temperature of about 300° C. to about 380° C., a pressure of about 1.5 MPag to about 3.5 MPaq, and an LHSV of about 0.2 hr −1 to about 0.8 hr − to reduce the sulfur content of said first feed to 15 wppm or less.

2. The process of claim 1 , wherein said treating with the second hydrocarbon feed is conducted from 3 days to 10 days.

3. The process of claim 1 , wherein said first and second hydrotreating conditions are substantially the same.

4. The process of claim 1 , wherein the first feed has an aromatics content of at least 20 wt %.

5. The process of claim 1 , wherein the second feed is produced by adding aliphatic hydrocarbons to the first feed.

6. The process of claim 5 , further comprising adding said aliphatic Hydrocarbons to the first feed so as to reduce an aromatics content thereof by at least 50%.