The filtered material is dried at {HEAD ~ 110° C.} for {TAIL ~ 15 hours} or heated at 400 550° C. for 5 10 hours to prepare it for use as a precursor 
for
The filtered material is dried at { HEAD ~ 110 ° C. } for { TAIL ~ 15 hours } or heated at 400 550 ° C. for 5 10 hours to prepare it for use as a precursor
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH