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 | DF | .~.~ Of Group VIII (i.e., iron or platinum group) {7} |
330 | .~.~.~ And Group I metal containing (i.e., alkali, Ag, Au or Cu) {1} | |
331 | DF | .~.~.~.~> Copper containing |