Tosoh Corporation

Toyota Jidosha Kabushiki Kaisha

Kabushiki Kaisha Toyota Chuo Kenkyusho

Akinori Eshita

Masao Nakano

Kazuhiko Sekizawa

Senshi Kasahara

Naoto Suzuki

Shinichi Matsumoto

Kenichi Takahashi

Koji Yokota

Kazunobu Ishibashi

Shiroh Kondoh

Kazumasa Suetsugu

Shunji Inoue

Takayuki Shoji

To provide electrolytic manganese dioxide excellent in cell performance in high rate discharge and middle rate discharge when used as a cathode material for alkaline manganese dry cells, and a method for its production. Electrolytic manganese dioxide, characterized in that the average size of mesopores is at least 6.5 nm and at most 10 nm, and the alkali potential is at least 290 mV and at most 350 mV; a method for its production and its application.

Electrolytic manganese dioxide, method for manufacturing same, and use thereof

To provide electrolytic manganese dioxide excellent in low rate characteristics and middle rate characteristics when used as a cathode material for alkaline manganese dry cells, and a method for its production. Electrolytic manganese dioxide of which the apparent density is at least 4.0 g/cmand at most 4.3 g/cm, and the mode particle size is at least 30 μm and at most 100 μm; a method for its production and its application.

Electrolytic manganese dioxide, method for producing same, and use of same

An object of the present invention is to provide electrolytic manganese dioxide to be used as a cathode active material for an alkali-manganese dry cell, which has a high alkali potential and is provided with a high reactivity and packing efficiency as a cathode for the cell, and which is excellent in the middle rate discharge characteristic, and electrolytic manganese dioxide excellent in the high rate discharge characteristic and the middle rate discharge characteristic, which will not cause corrosion of metal materials, and a method for its production. In the present invention, electrolytic manganese dioxide having an alkali potential of at least 280 mV and less than 310 mV, and FWHM of at least 2.2&#xb0; and at most 2.9&#xb0;, is used. It is preferred that of the electrolytic manganese dioxide, the (110)/(021) peak intensity ratio in the X-ray diffraction peaks is at least 0.50 and at most 0.80, and the (110) interplanar spacing is at least 4.00 &#x212b; and at most 4.06 &#x212b;. Further, electrolytic manganese dioxide wherein the JIS-pH (JIS K1467) is at least 1.5 and less than 2.6, the sodium content is at least 0.02 wt % and less than 0.10 wt %, the sulfate group content is less than 1.30 wt %, the median diameter is at least 30 &#x3bc;m and at most 50 &#x3bc;m, and the BET specific surface area is at least 20 m/g and at most 50 m/g, is preferred.

Electrolytic manganese dioxide, and method for its production and its application

A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen rich exhaust gas containing the same, comprising (i) a zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio of at least 15 and (ii) (a) silver and, optionally, (b) an alkali metal and/or an alkaline earth metal incorporated therein.

Catalyst for purifying exhaust gas

A catalyst, for purifying an exhaust gas, is a zeolite catalyst for removing nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing the nitrogen oxides, carbon monoxide and hydrocarbons, wherein the zeolite has an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 10 or more and contains nickel, or wherein the zeolite has an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of 15 or more, and contains nickel and a rare earth metal or an alkaline earth metal.

Method for purifying an oxygen-rich exhaust gas

A method for purifying an exhaust gas containing an excess amount of oxygen, to remove nitrogen oxides, carbon monoxide and hydrocarbons therefrom, by bringing a catalyst into contact with the exhaust gas, the catalyst comprising a zeolite ion-exchanged with (a) cobalt or (b) both cobalt and at least one metal selected from the group consisting of alkaline earth metals and rare earth metals, the zeolite being selected from the group consisting of ferrierite, ZSM-5, ZSM-11, ZSM-12 and ZSM-20, and having a silica-to-alumina molar ratio of from 15 to 1,000.

Method of purifying oxygen-excess exhaust gas

A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons, comprising (i) a zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio of at least 15 and (ii) (a) cobalt, (b) an alkaline earth metal and (c) silver, or nickel and/or zinc, or platinum and/or manganese, or copper and/or rhodium, incorporated thereinto.

Method for purifying exhaust gas

A method for cleaning an exhaust gas, entailing bringing the exhaust gas into contact with a crystalline aluminosilicate having a primary particle size of not less than 0.5 micron, containing one or more kinds of metal ions selected from the group of metals of Group Ib and Group VIII of the periodic table in an amount ranging from about 0.2 to 0.8 equivalent relative to one gram atom of aluminum, and having a mole ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of not less than about 20.

Method for exhaust gas cleaning

A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen-rich exhaust gas containing nitrogen oxides, carbon monoxide and hydrocarbons comprising (i) a zeolite having an SiO.sub.2 /Al.sub.2 O.sub.3 mole ratio of at least 15 and (ii) (a) cobalt, (b) a rare earth metal and (c) silver, or nickel and/or zinc, or platinum and/or manganese, or copper and/or rhodium, incorporated thereinto.

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Shinnanyo, Japan

Akinori Eshita