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