502 / | HD | CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING |
100 | DF | CATALYST OR PRECURSOR THEREFOR {12} |
232 | DF | .~ Silicon containing or process of making {2} |
240 | DF | .~.~ With metal, metal oxide, or metal hydroxide {8} |
246 | .~.~.~ Of Group V (i.e., V, Nb, Ta, As, Sb or Bi) {2} | |
247 | DF | .~.~.~.~> Of vanadium {1} |
249 | DF | .~.~.~.~> Of antimony or bismuth |