Lamella lepidocrocite particles and process for producing the same
AssigneeToda Kogyo Corporation
InventorTsutomu Katamoto
Life of this patent
Estimating the term…
Abstract
The disclosure describes lamella lepidocrocite particles containing 10 to 30 atm % of titanium calculated as Ti/(Ti+Fe) and having a BET specific surface area of 150 to 350 m.sup.2 /g.
Claims7
An oxidation catalyst for waste water treatment comprising 90 to 99.95 wt % of oxides comprising iron and titanium containing lamella lepidocrocite particles containing 10 to 30 atm % titanium, calculated as Ti/(Ti+Fe), and having a BET specific surface area of 150 to 350 m.sup.2 /g, and 0.05 to 10 wt % of at least one element selected from the group consisting of cobalt, nickel, cerium, silver, gold, platinum, palladium, rhodium, ruthenium and iridium.
Lamella lepidocrocite particles containing titania of 10 to 30 atm %, calculated as Ti/(Ti+fe), and having a BET specific surface area of 150 to 350 m.sup.2 /g, an average major axial diameter of 0.05 to 0.2 .mu.m, an average minor axial diameter of 0.01 to 0.05 .mu.m and a thickness of 30 to 100 .ANG..
A process for producing lamella lepidocrocite particles, comprising the steps of:
- reacting an aqueous ferrous salt solution, an aqueous titanium solution containing 10 to 30 atm % of titanium, calculated as Ti/(Ti+Fe), based on the Fe in said aqueous ferrous salt solution, and an aqueous alkali carbonate solution, to form an iron-containing precipitate containing titanium;
- and
- oxidizing the resultant suspension containing said precipitate in a temperature range of 5.degree. to 40 .degree. C. by passing an oxygen-containing gas thereinto while maintaining the pH of said suspension at 8.0 to 10.0.
Dependencies are inferred from the claim text.