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 {HEAD ~ a precursor} 
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 { HEAD ~ a precursor }
OTH OTH OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD