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