Large sol-gel SiO.sub.2 monoliths containing transition metal and their production
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United States of America Patent
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Jul 25, 1989
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N/A
app pub date -
Feb 25, 1985
filing date -
Feb 25, 1985
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Expired
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Abstract
Sol-gel monoliths containing SiO.sub.2 and optionally B.sub.2 O.sub.3, Na.sub.2 O, Li.sub.2 O, TiO.sub.2, Al.sub.2 O.sub.3 and mixtures thereof, and a transition metal having an atomic number from 21-28 made by mixing water, a SiO.sub.2 precursor, a non-precipitating salt of a transition metal and mellitic acid to form a sol, gelling the sol, aging the gelled sol, drying the aged gelled sol and densifying by heating to from about 500.degree. C. to about 1350.degree. C.
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