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} |