Tosoh Corporation

Hiroshi Miura

Kazumasa Suetsugu

Kazuhiko Sekizawa

Senshi Kasahara

Hidekazu Aoyama

Shin Kumagai

Masao Nakano

Hiroshi Ogawa

Shunji Inoue

Takayuki Shoji

Kazuo Sekitani

Shirou Nakamura

Hironobu Hosose

Shoji Adachi

To provide electrolytic manganese dioxide excellent in packing property and high-rate discharge characteristics when used as a cathode material for alkaline dry cells. Electrolytic manganese dioxide in which the half-value width of the (110) plane in XRD measurement using CuK&#x3b1; line as the radiation source is at least 1.8&#xb0; and less than 2.2&#xb0;, the peak intensity ratio of X-ray diffraction peaks (110)/(021) is at least 0.70 and at most 1.00, and the JIS-pH (JIS K1467) is at least 1.5 and less than 5.0; a method for producing the electrolytic manganese dioxide; and its application.

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

The invention provides electrolytic a manganese dioxide with a BET specific surface area of 20 to 60 m/g, and a volume of at least 0.023 cm/g for pores with pore diameters of 2 to 200 nm. Also provided is a method for producing an electrolytic manganese dioxide including a step of suspending a manganese oxide in a sulfuric acid-manganese sulfate mixed solution to obtain the electrolytic manganese dioxide, wherein a manganese oxide particles are continuously mixed with a sulfuric acid-manganese sulfate mixed solution, for a manganese oxide particle concentration of 5 to 200 mg/L in the sulfuric acid-manganese sulfate mixed solution. Still further provided is a method for producing a lithium-manganese complex oxide, including a step of mixing the electrolytic manganese dioxide with a lithium compound and heat treating the mixture to obtain a lithium-manganese complex oxide.

Electrolytic manganese dioxide and method for producing same, and method for producing lithium-manganese complex oxide

Disclosed is an electrolytic manganese dioxide having an alkali potential of at least 310 mV, a full width at half maximum of the (110) plane in the XRD measurement using the CuKline as the light source of from 2.2&#xb0; to 3.0&#xb0;, and a (110)/(021) peak intensity ratio in the X-ray diffraction spectrum of from 0.5 to 0.80. Also disclosed is a method for producing electrolytic manganese dioxide by electrolysis in an aqueous solution of a sulfuric acid/manganese sulfate mixture.

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

Disclosed is an electrolytic manganese dioxide having an alkali potential of at least 310 mV, a full width at half maximum of the (110) plane in the XRD measurement using the CuK&#x3b1; line as the light source of from 2.2o to 3.0o, and a (110)/(021) peak intensity ratio in the X-ray diffraction spectrum of from 0.5 to 0.80. Also disclosed is a method for producing electrolytic manganese dioxide by electrolysis in an aqueous solution of a sulfuric acid/manganese sulfate mixture.

An adsorbent for a hydrocarbon, comprising a calcined &bgr;-type zeolite showing a powder X-ray diffraction such that the sum of X-ray diffraction intensities at lattice spacings d&equals;1.15&plusmn;0.03 nm and d&equals;0.397&plusmn;0.01 nm, is at least 90% of the diffraction intensity at d&equals;0.346&plusmn;0.01 nm of Catalysis Society reference catalyst JRC-Z-HM-20(3).

Absorbent for a hydrocarbon, and exhaust gas-purifying catalyst

A method for removing nitrogen oxides from an oxygen-rich exhaust gas containing nitrogen oxides and hydrocarbons comprising bringing the oxygen-rich exhaust gas into contact with a catalyst comprising (1)(i) a zeolite containing an apatite compound and having an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least 15 and (ii) at least one active metal or (2)(ii) a zeolite containing an apatite compound and having an SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of at least 15, (ii) an alkaline earth metal and (iii) at least one active metal.

Method for removal of nitrogen oxides

A process for removing nitrogen oxides from oxygen rich exhaust gas containing nitrogen oxides and hydrocarbons using a catalyst composed of at least one active metal and zeolite having a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of at least 15, treated with a vapor of at least one silicon compound selected from alkylchlorosilanes, alkoxysilanes, alkoxyalkylsilanes, and silicon tetrachloride or treated with an alkoxysilane or silicon tetrachloride in an organic solvent.

Process for removing nitrogen oxides from oxygen rich exhaust gas

Nitrogen oxides are removed from an oxygen rich exhaust gas containing nitrogen oxides and hydrocarbons by bringing the oxygen rich exhaust gas into contact with a catalyst composed of phosphorus and at least one active metal contained in a zeolite having a molar ratio of SiO.sub.2 /Al.sub.2 O.sub.3 of at least 15.

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Shunan, Japan

Hiroshi Miura