These oxides can either be coupled to {HEAD ~ the zeolite} by being directly deposited on the zeolite or mechanically mixed with {TAIL ~ the zeolite} 
by mechanically mixed with
These oxides can either be coupled to { HEAD ~ the zeolite } by being directly deposited on the zeolite or mechanically mixed with { TAIL ~ the zeolite }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL