502 / | HD | CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING |
100 | DF | CATALYST OR PRECURSOR THEREFOR {12} |
224 | DF | .~ Halogen or compound containing same {6} |
229 | .~.~ And Group VIII metal (i.e., iron or platinum group) {1} | |
230 | DF | .~.~.~> Platinum group (i.e., Ru, Rh, Pd, Os, Ir or Pt) |