Abstract: A gas containing malodorous components is deodorized by passing the gas over a MnO.sub.2 based catalyst while the catalyst is heated by directly applying an electric current thereto, thereby catalytically oxidizing the malodorous components in the gas and effecting their removal.

Abstract: The catalyst according to the present invention can be utilized effectively as an ozone decomposing catalyst for catalytically decomposing to eliminate ozone contained in a gas and/or an ozone deodorizing catalyst for decomposing offensive odor ingredients contained in a gas by catalytic oxidation under the pretense of ozone, and it contains at least manganese carbonate as the essential component in the catalyst composition. Further, the catalyst contains, particularly preferably, MnO.sub.x (in which x=1.6-2.0) in addition to manganese carbonate and such a catalyst is obtained by applying a heat treatment to a catalyst raw material containing manganese carbonate in an oxidative atmosphere at 100.degree.-420.degree. C.

Abstract: The catalyst according to the present invention can be utilized effectively as an ozone decomposing catalyst for catalytically decomposing to eliminate ozone contained in a gas or as an ozone deodorizing catalyst for decomposing offensive odor ingredients contained in a gas by catalytic oxidation under the pretense of ozone, and it comprises a composition containing Mn oxide, metal Pd and/or Pd oxide as the essential ingredients formed as a thin film on a support. Further, the performance of the catalyst can be improved by using Mn oxide and Pd as the essential ingredient and using an alumina sol as a binder upon preparation.

Abstract: This invention relates to a catalyst for use in water treatment and to a method for the water treatment by the use of the catalyst. The catalyst comprises a first catalyst component e.g. the oxide of titanium, silicon, aluminum and zirconium, and a second catalyst component e.g. manganese, iron, cobalt, nickel, cerium, tungsten, copper, silver, gold, platinum, palladium, rhodium, ruthenium, and iridium or a sparingly water-soluble compound of the metal.

Abstract: The catalyst accordidng to the present invention can be utilized effectively as an ozone decomposing catalyst for catalytically decomposing to eliminate ozone contained in a gas or as an ozone deodorizing catalyst for deomposing offensive odor ingredients contained in a gas by catalytic oxidation under the pretense of ozone, and it comprises a composition containing Mn oxide, metal Pd and/or Pd oxide as the essential ingredients formed as a thin film on a support. Further, the performance of the catalyst can be improved by using Mn oxide and Pd as the essential ingredient and using an alumina sol as a binder upon preparation.

Abstract: A method of disposing of organic chlorine compounds by burning them in contact with a catalyst of composite oxides selected from titanium-silicon composite oxides, titanium-zirconium composite oxides, and titanium-silicon-zirconium composite oxides, whereby the resulting hydrogen chloride (HCl) is adsorbed by a basic absorbent.

Abstract: A process for producing aromatic or heterocyclic nitriles, which comprises reacting an alkyl-substituted aromatic hydrocarbon or an alkyl-substituted heterocyclic compound with ammonia and oxygen in the presence of a catalyst composition comprising (a) at least one composite oxide selected from the group consisting of a binary composite oxide comprising titanium and silicon, a binary composite oxide comprising titanium and zirconium and a ternary composite oxide comprising titanium, silicon and zirconium, and (b) an oxide of at least one metal selected from the group consisting of vanadium, molybdenum, tungsten, chromium, antimony, bismuth, phosphorus, niobium, iron, nickel, cobalt, manganese and copper.

Abstract: Efficient treatment of waste water is accomplished by subjecting the waste water to wet oxidation under continued supply of an oxygen containing gas at a temperature of not more than 370.degree. C. under a pressure enough for the waste water to retain the liquid phase thereof intact, in the presence of a catalyst containing a composite oxide of at least two metals selected from the group consisting of Ti, Si, and Zr and at least one metal selected from the group consisting of Mn, Fe, Co, Ni, W, Cu, Ce, Ag, Pt, Pd, Rh, Ru, and Ir or a compound of the one metal mentioned above.

Abstract: A catalyst for purifying exhaust gas, having deposited on a monolithic honeycomb carrier a catalyst composition comprising an alumina-modified cerium oxide obtained by impregnating a water-insoluble cerium compound with at least one member selected from the group consisting of water-soluble aluminum compounds and alumina hydrates and calcining the product of impregnation, at least one precious metal selected from the group consisting of platinum, palladium, and rhodium, and active alumina.

Abstract: A monolithic catalyst for purification of exhaust gases is produced by a process which comprises coating a monolithic support with an aqueous slurry composition comprising a powder of active alumina, at least one compound of a platinum-group element selected from the group consisting of platinum, palladium and rhodium, and a powder of cerium hydroxide.

Abstract: A process for producing a high-temperature resistant honeycomb catalyst, which comprises admixing cerium, zirconium, at least one metal selected from the group consisting of iron and nickel, at least one metal selected from the group consisting of platinum, palladium and rhodium, and optionally at least one metal selected from the group consisting of neodymium, lanthanum and praseodymium, each in the form of an aqueous solution or dispersion of a soluble or easily water-dispersible compound of the metal, with active alumina, drying the mixture, calcining it, dispersing the resulting catalyst composition in an aqueous medium, and depositing the dispersion on a monolithic honeycomb carrier. The resulting catalyst is useful for simultaneous conversion of hydrocarbons, carbon monoxide and nitrogen oxides in an exhaust gas.

Abstract: A method for the manufacture of a honeycomb carrier of enhanced resistance to thermal shocks, which method comprises applying a coat of water-soluble high-molecular organic compound to the surface of a ceramic honeycomb carrier of monolithic construction and subsequently depositing a catalyst component on the resultant coated carrier.

Abstract: Copper phthalocyanine of a novel crystal form which by measurement using CuK.alpha. radiation of .lambda. = 1.5418 A.U. shows an X-ray diffraction pattern having peaks at Bragg's angles 2.theta. equal to about 8.6.degree., 17.2.degree., 18.3.degree., 23.2.degree., 25.3.degree., 26.5.degree., and 28.8.degree..