| 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} |
| 305 |  | .~.~ Of Group VI (i.e., Cr, Mo, W or Po) {8} |
| 306 | DF | .~.~.~> And Group II metal containing (i.e., alkaline earth, Be, Mg, Zn, Cd or Hg) {1} |
| 308 | DF | .~.~.~> And Group IV metal containing (i.e., Ti, Zr, Hf, Ge, Sn or Pb) {2} |
| 311 | DF | .~.~.~> And Group V metal containing (i.e., V, Nb, Ta, As, Sb or Bi) {1} |
| 313 | DF | .~.~.~> And Group VIII metal containing (i.e., iron or platinum group) {3} |
| 317 | DF | .~.~.~> And Group I containing (i.e., alkali, Ag, Au or Cu) {1} |
| 319 | DF | .~.~.~> Of chromium {1} |
| 321 | DF | .~.~.~> Of molybdenum {1} |
| 323 | DF | .~.~.~> And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl) |