Heating silica gel in inert atmosphere before activation

摘要: A silica hydrogel is contacted with a hydroxy-containing organic compound which not completely miscible water but sufficiently so as to remove water, and thereafter the removed by heating in an inert atmosphere prior activation air. The allows utilizing preferred compounds such C 5 6 alcohols are desirable from commercial standpoint because of easy separation for recycle. In embodiment, aged at pH 7 9 means either adding base or chromium component containing bound nitrogen.