| 502 / | HD | CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING |
|
| 100 | DF | CATALYST OR PRECURSOR THEREFOR {12} |
| 300 | DF | .~ Metal, metal oxide or metal hydroxide {10} |
| 325 |  | .~.~ Of Group VIII (i.e., iron or platinum group) {7} |
| 326 | DF | .~.~.~> Of platinum group metal and of iron group (i.e., Ru, Rh, Pd, Os, Ir, or Pt and Fe, Co or Ni) {1} |
| 328 | DF | .~.~.~> And Group II metal containing (i.e., alkaline earth, Be, Mg, Zn, Cd or Hg) {1} |
| 330 | DF | .~.~.~> And Group I metal containing (i.e., alkali, Ag, Au or Cu) {1} |
| 332 | DF | .~.~.~> And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl) {4} |
| 337 | DF | .~.~.~> Of nickel |
| 338 | DF | .~.~.~> Of iron |
| 339 | DF | .~.~.~> Of palladium or platinum |