It has been found that CaX type adsorbents provide {HEAD ~ the removal} of N2O and {TAIL ~ hydrocarbons} in the third layer 
of
It has been found that CaX type adsorbents provide { HEAD ~ the removal } of N2O and { TAIL ~ hydrocarbons } in the third layer
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH