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