502 / | HD | CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING |
100 | DF | CATALYST OR PRECURSOR THEREFOR {12} |
174 | DF | .~ Inorganic carbon containing {4} |
180 | DF | .~.~ Elemental carbon {2} |
182 | DF | .~.~.~ And metal, metal oxide, or metal hydroxide {3} |
183 | .~.~.~.~ Of Group II (i.e., alkaline earth, Be, Mg, Zn, Cd or Hg) |