Nippon Shokubai Kagaku Kogyo Co., Ltd.

Tooru Ishii

Akira Inoue

Kiichiro Mitsui

Kunio Sano

Sadao Terui

Hideki Sogabe

Kuinio Sano

This invention relates to a catalyst for use in water treatment and to a method for the water treatment by the use of the catalyst. The catalyst comprises a first catalyst component e.g. the oxide of titanium, silicon, aluminum and zirconium, and a second catalyst component e.g. manganese, iron, cobalt, nickel, cerium, tungsten, copper, silver, gold, platinum, palladium, rhodium, ruthenium, and iridium or a sparingly water-soluble compound of the metal.

Catalyst for water treatment

A method for the purification of waste water by the use of a heat-exchanger type reaction vessel composed of a plurality of inner tubes and a shell defining jointly with the outer peripheries of the inner tubes a passage for the flow of a heat transfer medium, which method comprises passing said waste water through said inner tubes and, at the same time, feeding a molecular oxygen-containing gas to the flow of said waste water thereby establishing contact between said waste water and said feed gas and consequently effecting wet oxidation of the impurities present in said waste water.

Method for purification of waste water

A method for the treatment of waste water, which comprises wet oxidizing said waste water with a molecular oxygen-containing gas of an amount 1.0 to 1.5 times the amount thereof theoretically necessary for decomposing at least one substance selected from the group consisting of organic substances and inorganic substances present in said waste water to nitrogen, carbon dioxide, and water at a temperature not exceeding 370.degree. C. under a pressure enough for said waste water to retain a liquid phase in the presence of a solid catalyst comprising of a first catalytic component formed of titanium dioxide, a second catalytic component formed of the oxide of an element of lanthanide series, and a third catalytic component containing at least one metal selected from the group consisting of manganese, iron, cobalt, nickel, tungsten, copper, silver, gold, platinum, palladium, rhodium, ruthenium, and iridium or a water-insoluble or sparingly water-soluble compound of said metal.

Method for treatment of waste water

A carrier for a waste gas-treating catalyst, comprising an inorganic refractory oxide containing a composite oxide of titanium and zirconium possessing a crystalline structure of ZrTiO.sub.4, which is produced by heat-treating a substance containing a titanium compound and a zirconium compound at a temperature in the range of 600.degree. to 1,000.degree. C., and a catalyst for treatment of a waste gas comprising the carrier deposited a catalytically active component.

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Himeji, Japan

Tooru Ishii