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US 3,943,070 AGranted
Manufacture of spheroidal alumina particles
AssigneeUniversal Oil Products Company
InventorRoy T. Mitsche
Life of this patent
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Abstract
A method of manufacturing high surface area spheroidal alumina particles. A finely divided eta alumina is admixed and suspended in an alumina hydrosol and the mixture thereafter converted to spheroidal particles comprising eta and gamma alumina by the oil-drop method. The alumina spheres are particularly useful as a high surface area support or carrier material for catalytic components, and as a high surface area adsorbent.
Claims9
A method of manufacturing mixed eta and gamma alumina particles which comprises:
- a. admixing and suspending a finely divided eta alumina in an acid anion-containing alumina sol having an aluminum/acid anion ratio of from about 1:1 to about 1.5:1, said alumina being admixed with said sol in an amount to provide from about 20 to about 50 wt. % of the final alumina product;
- b. commingling the resulting sol with an ammonia precursor at below gelation temperature, said ammonia precursor being decomposable to ammonia with increasing temperature;
- c. dispersing the mixture as droplets in a hot oil bath effecting decomposition of said ammonia precursor and formation of hydrogel spheres therein;
- d. aging the spheres at an elevated temperature effecting decomposition of the residual ammonia precursor contained therein, and washing, drying and calcining the aged hydrogel spheres.
1 more element
Dependencies are inferred from the claim text.