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 | DF | .~ Iron containing catalyst {2} |
720 | .~.~ Pretreatment of the catalyst |