US PATENT SUBCLASS 423 / 213.2
.~.~ Utilizing as solid sorbent, catalyst, or reactant a material containing a transition element

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

210  DF  MODIFYING OR REMOVING COMPONENT OF NORMALLY GASEOUS MIXTURE {11}
212  DF  .~ Mixture is exhaust from internal-combustion engine {1}
213.2.~.~ Utilizing as solid sorbent, catalyst, or reactant a material containing a transition element {2}
213.5  DF  .~.~.~> Group VIII element
213.7  DF  .~.~.~> Including successive stage treatments to modify or remove a different component in each stage

DEFINITION

Classification: 423/213.2

(under subclass 212) Processes, in which the material used to treat the gaseous mixture is in the solid-state and comprises a transition element, or compound thereof, and which functions to (1) modify a component, or (2) attract and retain a component, or (3) react with and chemically change a component.

(1) Note. The transition elements are those having atomic numbers of 21 through 30, 39 through 48, 57 through 80, 89 through 103.

SEE OR SEARCH THIS CLASS, SUBCLASS:

212, for a process of treating the gaseous which the treating material, if a solid catalyst, sorbent or reactant, does not contain a transition element.