| 518 / | HD | CHEMISTRY: FISCHER-TROPSCH PROCESSES; OR PURIFICATION OR RECOVERY OF PRODUCTS THEREOF |
| 715 | DF | GROUP VIII METAL CONTAINING CATALYST UTILIZED FOR THE FISCHER-TROPSCH REACTION (i.e., Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, or Pt) {3} |
| 719 | | .~ Iron containing catalyst {2} |
| 720 | DF | .~.~> Pretreatment of the catalyst |
| 721 | DF | .~.~> The catalyst contains a metal in addition to the iron, or another material utilized contains a metal other than iron (e.g., as a promoter, retarder, etc.) |