Sakai Chemical Industry Co., Ltd.

Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Petrochemical Company Limited

Catalysts & Chemicals Industries Co., Ltd.

Mitsubishi Petrochemical Engineering Co., Ltd.

Kazuhiko Nagano

Tadao Nakatsuji

Masafumi Yoshimoto

Kimihiko Yoshida

Hiromitsu Shimizu

Kazunobu Abe

Toshikatsu Umaba

Minoru Yoneda

Kiyoshi Fukai

Hideto Mizutani

Shigefumi Kamisaka

Kazuya Mishina

Hiroshi Nakao

Shinji Ohgama

Tsutomu Hatanaka

Tetsuo Tatsu

Yoshiaki Obayashi

Kozo Iida

Shigeaki Mitsuoka

Makoto Imanari

Shigeru Nojima

Touru Seto

Morio Fukuda

Masayuki Hanada

Takeo Koshikawa

Akihiro Yamauchi

Kiyoshi Nagano

Hiroaki Rikimaru

Toshihiro Sugaya

Masahiro Tanaka

Tadao Nakasuji

Horiaki Rikimaru

Chiyo Honda

Hiroyoshi Urasumi

A process for the production of fine powder of metallic nickel which comprises a first step of dissolving nickel carbonate and/or nickel hydroxide in aqueous ammonia or in an aqueous solution of ammonia and at least one selected from the group consisting of ammonium carbonate, ammonium hydrogencarbonate, a carbonate of an alkali metal and a hydrogencarbonate of an alkali metal to prepare an aqueous solution of a nickel salt; converting the aqueous solution of a nickel salt to a W/O emulsion, and then removing volatile components including ammonia from the droplets to form precipitates of nickel carbonate in the droplets, thereby providing fine spherical particles of nickel carbonate; and a second step of heating the particles of nickel carbonate in the presence of a fusion preventive agent that is a compound of at least one element selected from the group consisting of alkaline earth elements, aluminum, silicon and rare earth elements in an atmosphere of hydrogen, thereby reducing the nickel carbonate to metallic nickel.

Method for producing fine powder of metallic nickel comprised of fine spherical particles

Method for producing fine spherical particles of carbonate or hydroxide of nickel, cobalt or copper

A catalyst for ozone decomposition which comprises:

Catalysts and methods for ozone decomposition

Regeneration of an ozone decomposing reactor which comprises: a catalyst structure composed of a carrier having at least one passage extending therethrough for allowing an ozone containing fluid to pass through the catalyst structure and a catalyst and an electroconductive material carried in or on the carrier; and electrodes attached to the catalyst structure to electrify the structure, whereby to decompose ozone at elevated temperatures and regenerating deactivated structure by electrifying and heating. The carrier is either a ceramic honeycomb mold or a fiber board.

Ozone decomposing reactor regeneration

The present invention provides a deodorizing method for removing malodorant components by oxidative destruction with ozone in the presence of a catalyst comprising a first component, which is a metal oxide, and a second component which is at least one member selected from the group consisting of titanium dioxide, silver oxide, silica and gold, or a catalyst comprising manganese dioxide and clay. Also, the present invention provides a deodorizing catalyst having its active components carried in a layer, having a thickness of 10 to 200 .mu.m, on the carrier, thereby stably removing malodorant components at a high rate, even when the reaction conditions are changed.

Deodorizing catalyst

A catalyst for decomposing ozone comprising a carrier and a catalytic active substance having ozone resolvability carried thereon in a thickness of 10 to 200 .mu.m. Consequently, ozone can efficiently be removed. The invention also includes the catalytic active substance or ozone adsorption substance which is contained in the carrier, such that the combination of the carrier and its contained material has ozone resolvability or ozone adsorbing ability in itself. Accordingly, the combination of these two features allows the thickness of the catalytic active substance carried on a carrier surface to be reduced to the range from 5 to 100 .mu.m. Thus, improved productivity, durability of the catalyst and ozone removing efficiency are provided.

Catalyst for decomposing ozone

Catalysts for denitrization

There is provided a method of producing titanium oxides which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in a molar ratio of sulfuric acid to titanium tetrachloride of at least 0.5 adding an alklai to the resultant solution to produce titanium hydroxide; and drying and calcining the titanium hydroxide. A further method is provided which comprises: adding a solution of an alkali to an aqueous solution of titanium tetrachloride having a concentration of not more than 2.5 moles/l at temperatures of not less than 50.degree. C., thereby to substantially thermally hydrolyze the titanium tetrachloride and to produce titanium hydroxide; and drying and calcining the titanium hydroxide.

Method of producing titanium oxides

The present invention relates to a particulate removing catalyst filter in which an oxidizing catalyst is carried on the surface portions of an air-permeable substrate to a depth, based on the substrate and the catalyst, of up to 19% measured from the exposed surface of the catalyst through which the exhaust gas is adapted to be passed, and to a particulate removing catalyst filter in which a catalyst is carried on a thin wire net or metallic plate having a plurality of fine through-holes. The exhaust gas from a diesel engine is forcibly passed through the filter, thereby to remove particulates in the exhaust gas.

Particulate removing catalyst filter

There is disclosed an ozone decomposing reactor which comprises:

Ozone decomposing reactor

There is disclosed an ozone decomposing reactor which comprises: an air permeable carrier containing a catalyst and an electroconductive material therein or thereon; and electrodes attached to the sheet to electrify and heat the sheet, whereby to decompose ozone at elevated temperatures. A fibrous sheet or a foamed material is used as the air permeable carrier.

Ozone decomposing reactor and regeneration thereof

Catalyst for denitrization

There is disclosed a catalyst structure for ozone decomposition which comprises a thin porous carrier material which has many micropores in the direction of the thickness of the carrier material and has an ozone decomposition catalyst supported thereon. Also disclosed is a method of ozone decomposition using such a catalyst structure, in which preferably the catalyst structure comprises a thin porous carrier material which has many micropores not less than 30 .mu.m in diameter in the direction of the thickness of the carrier material and has an ozone decomposition catalyst supported thereon. The carrier material may be of an electrically resistant material, and may be electrified and heated while a gas containing ozone is forcibly passed therethrough.

Methods of ozone decomposition and catalyst structures used therein

Methods for denitrization

Growing community of inventors

Osaka, Japan

Kazuhiko Nagano