Sakai Chemical Industry Co., Ltd.

National Institute for Research in Inorganic Materials

Matsushita Electric Works, Ltd.

Kazunobu Abe

Tadao Nakatsuji

Masashi Aoki

Toshikatsu Umaba

Kiyoshi Fukai

Kazuhiko Nagano

Minoru Yoneda

Hideto Mizutani

Hiroaki Rikimaru

Kazuhisa Hidaka

Shigefumi Kamisaka

Hiroshi Nakao

Shoichi Tamura

Hajime Uno

Tsutomu Hatanaka

Shinji Ohgama

Yasuhiko Terada

Shinichi Shirasaki

Hiroshi Hasegawa

Atsuki Terabe

Tadashi Takenaka

Kiyotaka Komori

Michimasa Tsuzaki

Seishiro Yamakawa

Masaru Mikami

Iwao Yamazaki

Toshihiro Sugaya

Akiyoshi Nozue

Koichiro Sakata

Kazumi Sugimoto

Tosiaki Matsuda

Takeshi Ito

Kayoko Segawa

Chiyo Honda

Takeshi Fukunaga

Hiroyoshi Urasumi

Satoshi Fujiki

The invention provides a surface-modified titanium dioxide particle inhibited in photocatalytic activity and reduced in amount of volatile water. The surface-modified titanium dioxide particle has on the surface a crystalline composite compound of at least one of alkaline earth metals selected from magnesium, calcium, barium and strontium complexed with titanium dioxide in an amount of 0.1-20% by weight based on the weight of the surface-modified titanium dioxide particle in terms of oxide of the alkaline earth metal. The surface-modified titanium dioxide particle is produced by heating a compound of an alkaline earth metal and a titanium dioxide particle at a temperature of 60&#xb0; C. or higher so that the alkaline earth metal is complexed with titanium dioxide to form a crystalline composite compound on the surface of the titanium dioxide particle in an amount of 0.1-20% by weight based on the weight of the surface-modified titanium dioxide particle in terms of oxide of the alkaline earth metal.

Surface-modified titanium dioxide particle and method for producing the same

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 multilayer piezoelectric composite comprising a bonded laminate each layer of which is composed of a green sheet of a low-temperature sintering lead zirconate titanate piezoelectric ceramic. The temperature coefficient of a frequency constant of at least one layer has a polarity opposite to the polarity of those of the other layers. The bonded laminate is sintered at a temperature which does not produce any or almost any interdiffusion between layers so that the absolute value of the temperature coefficient of a frequency constant of the bonded laminate is smaller than the absolute value of the temperature coefficient of a frequency constant of any or one of the layers.

Method of making a multilayer piezoelectric composite

A composite dielectric is formed with a matrix synthetic resin and particulate porous, inorganic dielectric dispersed in the matrix synthetic resin. The dielectric constant of this composite dielectric can be thereby elevated effectively without enlarging the dissipation factor (tan .delta.) of the composite dielectric.

Composite dielectric and printed-circuit use substrate utilizing the same

A process for producing a powder material for niobium-containing lead perovskite ceramics represented by the general formula:

Process for producing powder material for lead perovskite ceramic

A process for producing a peroxoniobic acid sol which comprises: adding a strong acid, hydrogen peroxide and water to at least one niobium compound selected from the group consisting of niobium hydroxide, niobium oxide and niobium pentachloride to provide an aqueous solution of peroxoniobic acid; and then maintaining the aqueous solution at a temperature of 5.degree.-50.degree. C.

Process for producing peroxoniobic acid sol

A composition for producing ceramic dielectrics which comprises: a mixture of barium titanate which has average particle size of 0.1-1.5 .mu.m is amounts of 98-60 mole % and a perovskite type barium titanate solid solution which has average particle size of 0.1-1.5 .mu.m and a Curie temperature of 50.degree.-115.degree. C. in amounts of 2-40 mole %; and

Ceramic dielectrics and compositions therefor

An .alpha.-olefin polymerization catalyst which comprises a perovskite type complex compound comprising a perovskite type compound represented by the formula

Method of producing a composite material comprising a perovskite complex

A molded catalyst for fitting into a reactor vessel having an inlet and an outlet for a reactant gas, the catalyst having openings therethrough parallel to the direction of a reactant gas which is introduced into the reactor vessel from the inlet, the catalyst comprising: a wear-resistant front surface facing the inlet of the reactor vessel and a continuation of the front surface extending therefrom, the both being the front portion of the catalyst, and the remaining part of the catalyst made so wear-susceptible as to have either:

Molded catalyst and method of catalytic gas reactions using the same

A molded catalyst for fitting into a reactor vessel having an inlet and an outlet for a reactant gas, the catalyst having openings therethrough parallel to the direction of a reactant gas which is introduced into the reactor vessel from the inlet, the catalyst comprising: a wear-resistant front portion facing the inlet of the reactor vessel, and the remaining portion of the catalyst made so wear-susceptible as to have either:

Molded catalyst for catalytic gas reactions

A process for producing a composition which includes a perovskite compound, the process comprising:

Process for producing a composition which includes perovskite compounds

A method is provided for producing a catalytic structure in the form of sheet or honeycomb for the gas phase reduction of nitrogen oxides. The method comprises: beating an inorganic fiber in water to form a slurry; forming the slurry into a sheet by paper-making means and drying the sheet; impregnating the sheet or a honeycomb structure manufactured therefrom which has a porosity of 60-85% with an impregnating slurry which contains titanium dioxide or its precursor in a concentration at least of 100 g/l and has a viscosity of 5-250 cps. at normal temperatures, drying, and when necessary calcining the structure; and then immersing the structure in a solution containing a catalytically active agent or its precursor, drying and calcining the structure, thereby to provide a porous catalytic structure having titanium dioxide and the catalytically active agent substantially uniformly dispersed and supported therein.

Method for producing a catalytic structure for the reduction of nitrogen

A method is provided for producing a catalyst and a carrier therefor in the form of sheet or honeycomb. The method comprises: beating a heat-resistant fiber such as asbesto fiber in water to form a slurry; mixing the slurry with a catalytically active agent, a carrier material therefor and/or their precursors to fix such materials in the fiber, thus forming a stock; and forming the stock into a sheet and drying the same. The sheet thus obtained may be formed into a honeycomb structure with an improved adhesive.

Method for producing a catalyst and a carrier therefor including

A method for packing catalysts comprising packing the catalysts having through-holes in the direction of the flow of the gas with plurality of them being arranged in the direction of the flow of the gas through the catalyst-packed layers, characterized by arranging the catalysts in such manner that the sections of the connecting parts in the direction of the flow of the gas do not lie on the same plane as at least one of the above sections of the connecting parts formed by the adjacent catalysts.

Growing community of inventors

Osaka, Japan

Kazunobu Abe