Abstract: This invention provides a catalyst for purifying exhaust gases of a diesel engine, said catalyst comprising at least one element selected from nickel and cobalt and optionally a copper element. Further, this invention provides a catalyst for purifying exhaust gases of a diesel engine, said catalyst comprising a refractory three-dimensional structure and deposited thereon a catalyst component comprising the above elements and a refractory inorganic oxide. These catalysts can remove harmful ingredients contained in exhaust gases of a diesel engine, such as carbonaceous fine particles, unburned hydrocarbons, carbon monoxide, etc. by burning from low temperatures and suppress sulfate formation from sulfur dioxide.

Abstract: A process for producing a denitration catalyst comprising the following steps of immersing a base material composed of an inorganic fiber cloth in an aqueous slurry containing 5 to 20% by weight of at least one sol-form substance selected from the group consisting of silica sol, titania sol and zirconia sol, as a first component, 20 to 70% by weight of at least one inorganic oxide fine powder selected from the group consisting of those of titania, zirconia and cordierite, as a second component, and 1 to 3% by weight of at least one organic binder selected from the group consisting of polyvinyl alcohol, polyvinyl acetate and carboxymethyl cellulose, as a third component, removing superfluous liquid from the resulting base material, drying the base material, coating catalyst components onto the surface of the dried base material, and drying and calcining the resulting material, are proposed.

Abstract: The process is particularly well suited to the manufacture of composite materials, where a fibrous reinforcement texture is to be impregnated by a densifying matrix, and comprises the steps of:preparing a slurry containing a solid charge in the form of finely divided particles dispersed in a carrier liquid, which preferably contains an organic compound,placing a substrate inside an enclosure,creating a vacuum inside the enclosure, andcausing the slurry to pass through the substrate by means of a pressure difference.Uniformity of charge integration is ensured by forcing the slurry to pass through the substrate several times, in successively opposite directions. The concentration of solid charge in the slurry can be determined as a function of an intended charge percentage by volume in said substrate.

Abstract: A method of depositing a metal film on a silyl hydride surface of a solid such as silica gel, the solid normally having hydroxyl groups, the metal with a valence of zero being deposited on the surface by reaction of a metal ion in a solution with the hydrogens of the silyl hydrides. The above method is used to easily remove metal ions from a solution and also the method is a basis for determining the number of silyl hydride groups on the surface of the solid.

Abstract: A chromium-containing fluorination catalyst which comprises an activity-promoting amount of zinc or a compound of zinc, a process for increasing the activity of a chromium-containing fluorination catalyst by introducing an activity promoting amount of zinc or a compound of zinc to the catalyst and a process for the production of fluorinated hydrocarbons, in particular 1,1,1,2-tetrafluorethane which comprises reacting a hydrocarbon or a halogenated hydrocarbon, in particular 1-chloro-2,2,2-trifluoroethane with hydrogen fluoride in the vapour phase in the presence of the zinc-promoted chromium-containing catalyst.

Abstract: Thermally stable ceric oxide-based compositions, well suited as catalysts/catalyst supports for a wide variety of reactions, notably for the catalytic conversion of exhaust gases emanating from internal combustion engines, comprise particulates of immixture of a major amount of ceric oxide with at least one other metal oxide of magnesium, gallium, boron, scandium, or mixture thereof, and having a specific surface greater than 10 m.sup.2 /g after calcination at 800.degree. C.

Abstract: Aqueous cleaning compositions and methods of use are disclosed with a thickening agent including an alkyl ether sulfate surfactant forming about 0.1 to about 10% by wt. of the composition, a solvent selected from the class consisting of terpene derivatives including a functional group and tertiary alcohols forming about 0.01 to about 10% by wt. of the composition and an electrolyte component in an amount effective for enhancing thickening effects of the alkyl ether sulfate surfactant and solvent. The electrolyte component preferably includes a hypochlorite of an alkali metal and more preferably at least one additional multivalent electrolyte, the additional multivalent electrolyte most preferably being sodium carbonate. With the electrolyte component including a hypochlorite, additional electrolytes and the solvent are selected to be bleach stable, the solvent also preferably being a fragrance for the composition.

Abstract: A catalyst composition comprising a Group VIA metal, a Group VIII metal and an alumina, the catalyst composition containing the Group VIA metal and the Group VIII metal in a combined amount of 20 to 70% by weight based on the total of the Group VIA metal, the Group VIII metal and the alumina, being characterized by an X-ray diffraction pattern having no diffraction peak other than that of the alumina, and, after air-calcined at 550.degree. C. for three hours, being characterized by a TPR spectrum of the air-calcined catalyst composition in that the TPR spectrum gives a ratio of the area L of a low temperature reduction peak to the area H of a high temperature reduction peak, L/H, ranging from 0.1 to 0.45.

Abstract: An improvement in the oxidation catalyst used for the partial oxidation of n-butane and containing vanadium and phosphorus, zinc, lithium and molybdenum mixed oxides which comprises carrying out the crystallization step under static conditions which allows for more uniform conditions for crystal growth. The static conditions are maintained by refluxing the solvent during the period of crystallization.

Abstract: This invention is a catalytic element for use in the catalytic oxidation of ammonia. The element comprises a foraminous structure fabricated from a material consisting essentially of a metal selected from the group consisting of platinum, rhodium, palladium and alloys of mixtures thereof characterized by (a) a novel configuration whereby the initial product of the formula: curve to the flat ratio (C/F) multiplied by mesh count in inches (N) and wire diameter (d.sub.W), for said element is at least about 0.08 and (b) where, for a given hydrogen throughput, the conversion efficiency is a function of the curve to flat ratio (C/F), wire diameter (d.sub.W) and mesh count (N) combination and conversion efficiency is improved by increasing the mesh count (N) for a given wire diameter, increasing the wire diameter (d.sub.W) for a given mesh count, and increasing the curve to flat ratio (C/F) to a ratio of above 1.0. Preferably the initial product of the formula is greater than 0.2, more preferably 0.

Abstract: The alpha-halogenated carboxylic acids/esters are dehalogenated by reaction with hydrogen in the presence of a catalytically effective amount of (i) a Group VIII precious metal catalyst and (ii) either sulfur or a sulfur compound, or (iii) a novel precious metal/sulfur solid phase catalyst; the subject dehalogenation is especially adapted for enriching the monochloroacetic acid content of MCAA/DCAA mixtures.

Abstract: A tandem support structure for an exhaust gas purifying catalyst comprises a sleeve, a first honeycomb disposed on an upstream side of exhaust gases, and a second honeycomb disposed on a downstream side of exhaust gases at a position axially separated from the first honeycomb. The second honeycomb is fixed to the sleeve, and the first honeycomb is held by a holding member which axially extends in an upstream direction from said second honeycomb, without contacting the sleeve. Since an air layer exists between the first honeycomb and the sleeve, heat radiation from the first honeycomb is prevented and temperature rising characteristics of the first honeycomb are improved.

Abstract: Monolithic catalyst shaped articles adopted for the catalytic oxidation conversion of compounds of sulfur, e.g., HS, into sulfur dioxide, include a monolithic substrate containing a catalytically effective amount of at least one catalytically active element for oxidatively converting such compounds of sulfur into SO.sub.2.

Abstract: This invention relates to a method for controlling the conductance of heated structures used to initiate faster light-off in emission control systems such as used for automotive catalytic converters, diesel particulate filters and industrial stacks and other applications in which the exhaust gas stream temperature is too low to initiate fast light-off. The invention also relates to a method for minimizing the amount of conductive material used for making such structures.

Abstract: Disclosed is a process of preparing a catalyst supporting highly metal particles comprising, in the presence of carbon monoxide in a solution containing a metal-containing ion and a support on which metal particles produced by reduction of the metal-containing ion are supported, reducing by means of a reductant the metal-containing ion to the corresponding metal particles which are then supported on the support. According to the process of the present invention, because of the presence of the carbon monoxide which is supposed to have a function of depressing the deposition of a new metal particle present around the metal particles supported on the support, that is, the growth of the metal particles and another function of preventing the agglomeration among the metal particles supported, the catalyst of excellent properties having the metal particles supported and monodispersed on the support with the narrow particle size distribution can be prepared of which an average particle size is not more than 20 .ANG..

Abstract: A method of pretreating the connecting elements of a gas-tight sleeve-type pipe connection which includes a tight metal seat and abutting joint shoulders. The connection is effected by screwing threaded pipe ends into a sleeve having threaded portions. The pipes are of high-alloy steel and the connecting elements are of austenitic steels with chromium and nickel contents of greater than 20% by weight and molybdenum contents of greater than 2.5% by weight, as well as austenitic materials with nickel contents of greater than 50% and chromium and molybdenum contents of greater than 10% by weight. The connecting elements of the sleeve are coated with a metal layer. The method includes cleaning the connecting elements and subsequently applying as a lubricant on the connecting elements a metal-free, ceramic-based paste whose principal components are silicates, titanium oxide, and zinc sulfide as solid components, as well as vegetable oils and white oils.

Abstract: The invention relates to highly processable, hydrophobic aramid fibers of high modulus, improved surface frictional properties, scourability, low abrasion depositing, low fibrillation obtainable by surface reaction of an aromatic polyamide fiber with a surface reactant comprising a ketene dimer[R.sup.1 R.sup.2 C.sub.2 O][R.sup.1 R.sup.2 C.sub.2 O] (I).The invention further relates to a process for the production and the use of said fibers.

Abstract: An activated porous phosphorus/vanadium oxide catalyst adapted for the catalytic oxidation of a hydrocarbon to produce a carboxylic acid anhydride. The catalyst comprises shaped bodies having a B.E.T. surface area of at least about 15 m.sup.2 /g, an average vanadium oxidation state of between about 4.0 and about 4.5, a total pore volume of at least about 0.15 cc/g, a normalized apparent shaped body density of between about 1.25 and about 2.0 g/cc, and a crush strength of at least about 4 pounds. At least about 5% of the pore volume of the catalyst is constituted of pores having a diameter of at least about 0.8 microns, and at least about 4% of the pore volume is constituted of pores having a diameter of at least about 10 microns.

Abstract: Disclosed is a process of preparing a catalyst supporting highly metal particles comprising, in the presence of ethylene and/or acetylene in a solution containing a metal-containing ion and a support on which metal particles produced by reduction of the metal-containing ion are supported, reducing by means of a reductant the metal-containing ion to the corresponding metal particles which are then supported on the support. According to the process of this invention, because of the presence of the ethylene and/or acetylene which is supposed to have a function of depressing the deposition of new metal particles present around the metal particles supported on the support, that is, the growth of the metal particles and another function of preventing the agglomeration among the metal particles supported, the catalyst of the desired properties can be prepared.

Abstract: Process for preparing a catalyst for hydrosilylation reactions which comprises reacting (A) a rhodium complex Rh(R.sub.2 S).sub.3 X.sub.3, in which R represents alkyl and other specified hydrocarbon groups and X represents Cl or Br with (B) an organohydrogen polysiloxane in the presence of (C) an organosiloxane having silicon-bonded vinyl or allyl groups. The ratio of silicon-bonded hydrogen atoms provided by (B) to each Rh atom provided by (B) is in the range from 0.5:1 to 6.0:1.The invention also includes the use of the catalyst for reacting .ident.SiH with .ident.Si Alkenyl especially in compositions for the treatment of substrates such as paper and plastics.