Abstract: 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.

Abstract: A catalyst for ozone decomposition which comprises:(a) at least one selected from the group consisting of clay and carbon;(b) manganese dioxide; and optionally(c) titanium dioxide; and/or(d) at least one oxide of a metal selected from the group consisting of Cu, Co, Fe, Ni and Ag.A further catalyst for ozone decomposition which comprises:(a) at least one oxide of a metal selected from the group consisting of alkali metals and alkaline earth metals;(b) manganese dioxide; and optionally(c) titanium dioxide; and/or(d) at least one selected from the group consisting of clay and carbon.

Abstract: 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; andelectrodes 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.

Abstract: A process for removing nitrogen oxides from an exhaust gas by bringing the exhaust gas containing nitrogen oxides into contact with at least one catalyst selected from a polyvalent metal phosphate, a polyvalent metal sulfate or an aluminate of a transition metal of the 4th period of the Periodic Table in an oxidizing atmosphere containing excess oxygen and in the presence of a hydrocarbon or an oxygen containing organic compound. There is also disclosed a process for removing nitrogen oxides from an exhaust gas which comprises bringing the exhaust gas into contact with the above catalyst and then with an oxidation catalyst.

Abstract: A catalyst for ozone decomposition which comprises:(a) at least one selected from the group consisting of clay and carbon;(b) manganese dioxide; and optionally(c) titanium dioxide; and/or(d) at least one oxide of a metal selected from the group consisting of Cu, Co, Fe, Ni and Ag.A further catalyst for ozone decomposition which comprises:(a) at least one oxide of a metal selected from the group consisting of alkali metals and alkaline earth metals;(b) manganese dioxide; and optionally(c) titanium dioxide; and/or(d) at least one selected from the group consisting of clay and carbon.

Abstract: 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.

Abstract: A process for producing a powder material for niobium-containing lead perovskite ceramics represented by the general formula:PbA.sub.x Nb.sub.1-x O.sub.3,wherein X=1/2 or 1/3, A represents at least one element selected from the group consisting of Fe, Co, Cr, Ni, Mn, Mg, Zn, Cd, Zr, In, Cu and Hf. A dried mixture of a sol or a suspension of a hydroxide a component A which has a lower activity than Pb and a niobic acid sol is first calcinated. A Pb compound is then added with the mixture and the resultant mixture is calcinated again.

Abstract: The present invention provides an exhaust gas treating method by which exhaust gas is passed through a catalyst layer at an areal velocity of 100 to 5000 m.sup.3 /m.sup.2 .multidot.hr to selectively produce carbon monoxide from particulates contained in the exhaust gas, so that nitrogen oxides contained in the exhaust gas are removed by the carbon monoxide thus produced. The exhaust gas treating method of the present invention can readily and securely remove particulates and nitrogen oxides contained in exhaust gas, i.e., two primary causes of air pollution, by merely passing the exhaust gas through a catalyst layer at a specific areal velocity.

Abstract: A denitrizing catalyst with comprises:(a) a zeolite represented by the general formula (I)H.sub.A M.sub.B [(AlO.sub.2).sub.X .multidot.(SiO.sub.2).sub.Y ].multidot.2H.sub.2 0wherein M is an alkali metal or an alkaline earth metal, and A+nB=X wherein n is a valency of the metal M, in amounts of 80-99.9% by weight; and(b) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, in amounts of 0.1-20% by weight.A further denitrizing catalyst which comprises a zeolite represented by the general formulaH.sub.A (M.sup.1).sub.B (M.sup.2).sub.c [(AlO.sub.2).sub.X .multidot.(SiO.sub.2).sub.Y ].multidot.2H.sub.Z Owherein M.sup.1 is an alkali metal or an alkaline earth metal, M.sup.2 is a metal selected from the group consisting of Ru, Rh, Pd, Ag, Pt, Au, Co, Cu, Cr and Ni, A+n.sub.1 B+n.sub.2 C=X wherein n.sub.1 and n.sub.2 are valecies of the metals M.sup.1 and M.sup.2, respectively.

Abstract: 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.

Abstract: 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.

Abstract: There is disclosed 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; andelectrodes attached to the catalyst structure to electrify the structure, whereby to decompose ozone at elevated temperatures.The carrier is either a ceramic honeycomb mold or a fiber board.

Abstract: There is disclosed an ozone decomposing reactor which comprises:an air permeable carrier containing a catalyst and an electroconductive material therein or thereon; andelectrodes 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.

Abstract: A denitrizing catalyst which comprises:(a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90% by weight as oxides;(b) at least one metal oxide selected from the group consisting of Co.sub.3 O.sub.4, Cu.sub.2 O, Cr.sub.2 O.sub.3, Mn.sub.2 O.sub.3, NiO, PbO, Bi.sub.2 O.sub.3, MoO.sub.2, Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, Fe.sub.2 O.sub.3, TiO.sub.2, WO.sub.3, MoO.sub.3, SnO.sub.2 and ZnO in amounts of 5-50% by weight as oxides; and(c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10% by weight as metals.Nitrogen oxides contained in waste gases are denitrized effectively by putting the gases into contact with the catalysts in the absence or presence of carbon monoxide as a reducing agent.

Abstract: 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(A) at least one of niobium oxides and tantalum oxides in amounts of 0.3-2 moles % in relation to 100 mole % of the mixture; and(B) at least one of cobalt oxides, nickel oxides, magnesium oxides, manganese oxides, copper oxides and oxides of a rare earth metal in amounts of 0.1-2 moles % in relation to 100 mole % of the mixture.The composition provides a ceramic dielectric which has a large relative permittivity and still has a small temperature dependence of relative permittivity within .+-.15% over a temperature range between -55.degree. C. and +125.degree. C. taking a relative permittivity at 20.degree. C. as a standard.

Abstract: 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.

Abstract: A process for producing microcrystalline barium ferrite platelets which comprises: forming an aqueous alkaline dispersion containing coprecipitates of hydroxides of barium ions, iron (III) ions, and optionally ions of a substituent element; heating the dispersion to a temperature of not less than 50.degree. C. and not more than the boiling point of the dispersion under an atmospheric pressure to convert the coprecipitates to precursors of the barium ferrite; calcining the precursors to provide microcrystalline barium ferrite platelets; the improvement comprising the step of adding a carbonating agent such as sodium carbonate to the aqueous alkaline dispersion before or after the heating of the aqueous dispersion to insolubilize water soluble barium ions therein, and the step of calcining the barium ferrite precursors in the presnece of sodium sulfate at temperatures of 700.degree.-900.degree. C., to provide microcrystalline barium ferrite platelets of about 0.03-0.1 .mu.

Abstract: An .alpha.-olefin polymerization catalyst which comprises a perovskite type complex compound comprising a perovskite type compound represented by the formulaABO.sub.3wherein A is at least one element selected from the group consisting of alkaline earth metals and Pb, and B is at least one element selected from the group consisting of Ti, Zr, Hf and Sn; the complex compound further containing at least one oxide of element selected from the group consisting of rare earth elements, transition elements, Bi, Sb and Sn doped in the perovskite type compound in an amount of 0.1-3 mol %.A composite material which comprises the catalyst having an .alpha.-olefin polymer deposited thereon, is useful as, for example, a dielectric ceramic material.

Abstract: A denitrizing catalyst which comprises:(a) an alkali metal oxide or an alkaline earth metal oxide in amounts of 50-90% by weight as oxides;(b) at least one metal oxide selected from the group consisting of Co.sub.3 O.sub.4, Cu.sub.2 O, Cr.sub.2 O.sub.3, Mn.sub.2 O.sub.3, NiO, PbO, Bi.sub.2 O.sub.3, MoO.sub.2, Al.sub.2 O.sub.3, SiO.sub.2, ZrO.sub.2, Fe.sub.2 O.sub.3, TiO.sub.2, WO.sub.3, MoO.sub.3, SnO.sub.2 and ZnO in amounts of 5-50% by weight as oxides; and(c) at least one metal or at least one oxide of metals selected from the group consisting of Ru, Rh, Pd, Ag, Pt and Au in amounts of 0.01-10% by weight as metals.Nitrogen oxides contained in waste gases are denitrized effectively by putting the gases into contact with the catalysts in the absence or presence of carbon monoxide as a reducing agent.

Abstract: There is provided a method of producing titanium-oxides which comprises: admixing an aqueous solution of titanium tetrachloride with sulfuric acid in amounts of at least 0.5 times is moles as the titanium tetrachloride; adding an alkali 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.