| 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} |
| 344 | ![]() | .~.~ Of Group I (i.e., alkali, Ag, Au or Cu) {2} |
| 345 | DF | .~.~.~> Of copper {1} |
| 347 | DF | .~.~.~> Of silver {1} |