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} |
353 | DF | .~.~ Of Group V (i.e., V, Nb, Ta, As, Sb or Bi) {1} |
354 | .~.~.~ And Group III metal containing (i.e., Sc, Y, Al, Ga, In or T1) |