Method for preparing porous tin oxide monolith with high specifi

Details Method for preparing porous tin oxide monolith with high specifi Method for preparing porous tin oxide monolith with high specifi

1995-04-26

1998-07-07

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

502352, C01G 1902

Patent

active

057764255

ABSTRACT:
A process for preparing high specific surface area and small pore size tin oxide monolith is disclosed. It includes the steps of: (a) dissolving tin chloride or its hydrate in alcohol to form an alcohol solution having a tin ion concentration ranging between 0.001 to 5.0M, and then mixing the alcohol solution with water to make a tin-alcohol-water mixture solution, wherein the moral ratio between water and tin ion ranges between 3,500:1 and 100:1; (b) settling the tin-alcohol-water mixture solution until a colloid or flocculent-type gel is formed and settles to the bottom of the mixture solution to form sediments; (c) removing the mixture solution above the sediments, then adding fresh water or fresh water/alcohol mixture to the sediments to thereby increase the solution pH without the use of any alkaline solution; (d) repeating steps b and c until the solution pH of the mixture solution reaches a predetermined value; (e) collecting and drying the sediments, which become gel-like sediments, to obtain a tin oxide monolith; and (f) heat-treating the tin oxide monolith obtained from step (e) to obtain heat-treated tin oxide monolith.

REFERENCES:
patent: 1682240 (1928-08-01), Patrick
patent: 1879022 (1932-09-01), Barclay
patent: 5330833 (1994-07-01), Yamashita et al.
Chemical Abstract 117: 51781x, "Preparation of Silica-MxOy Thin Films and Gels . . . Metal Halides", Aug./1992.

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