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} |
340 | .~.~ Of Group II (i.e., alkaline earth, Be, Mg, Zn, Cd or Hg) {2} | |
341 | DF | .~.~.~> And Group III metal containing (i.e., Sc, Y, Al, Ga, In or Tl) {1} |
343 | DF | .~.~.~> Of zinc |