Abstract: The invention relates to a micro-encapsulated self-repairing polymerizable composition that comprises at least one selected polymerizable compound to be integrated into organic, inorganic or composite materials for the self-repairing of damages incurred in the use conditions thereof, characterized in that micro-encapsulated polymerizable composition is integrated alone into said materials and, after the release of the microcapsule and in the absence of a catalyst, spontaneously polymerizes in the presence of a polymerization-triggering agent that is absent in said materials but naturally occurs during the use thereof, thus repairing said damages.

Abstract: The invention relates to a micro-encapsulated self-repairing polymerizable composition that comprises at least one selected polymerizable compound to be integrated into organic, inorganic or composite materials for the self-repairing of damages incurred in the use conditions thereof, characterised in that micro-encapsulated polymerizable composition is integrated alone into said materials and, after the release of the microcapsule and in the absence of a catalyst, spontaneously polymerises in the presence of a polymerisation-triggering agent that is absent in said materials but naturally occurs during the use thereof, thus repairing said damages.

Abstract: The invention relates to antimicrobial non-cross-linked polymers which are constituted of an ester and/or amide resin to which quaternary ammonium salts are bound by a covalent bond which is potentially reactive with water, the quaternary ammonium content being at least 1 M/kg, a well as to the use thereof for the preparation of a material having antimicrobial properties and to their methods of preparation.

Abstract: Particular mixed vanadium/other metal catalysts, well suited for the desulfurization of gaseous effluents containing contaminating amounts of objectionable sulfur compounds, typically via the Claus reaction and notably in the presence of oxygen, comprise a support substrate, e.g., titanium dioxide, having an active catalytic phase deposited thereon, such active catalytic phase being constituted of an electroneutral solid solution having the average composition:A.sub.4.+-.y V.sub.2.+-.x O.sub.9in which A is a metal other than vanadium, e.g., magnesium, calcium or zinc, 0.ltoreq.x.ltoreq.0.2 and 0.ltoreq.y.ltoreq.0.5.

Abstract: The desulfurization of gaseous effluents containing contaminating amounts of objectionable sulfur compounds, typically via the Claus reaction and notably in the presence of oxygen, utilizing a support substrate, e.g., titanium dioxide, having an active catalytic phase deposited thereon, such active catalytic phase being constituted of an electroneutral solid solution having the average composition:A.sub.4.+-.y V.sub.2.+-.x O.sub.9in which A is a metal other than vanadium, e.g., magnesium, calcium or zinc, 0.ltoreq.x.ltoreq.0.2 and 0.ltoreq.y.ltoreq.0.5.

Abstract: Particular mixed vanadium/other metal catalysts, well suited for the desulfurization of gaseous effluents containing contaminating amounts of objectionable sulfur compounds, typically via the Claus reaction and notably in the presence of oxygen, comprise a support substrate, e.g., titanium dioxide, having an active catalytic phase deposited thereon, such active catalytic phase being constituted of an electroneutral solid solution having the average composition:A.sub.4.+-.y V.sub.2.+-.x O.sub.9in which A is a metal other than vanadium, e.g., magnesium, calcium or zinc, 0.ltoreq.x.ltoreq.0.2 and 0.ltoreq.y.ltoreq.0.5.

Abstract: Multiple purpose catalysts adapted for the treatment of internal combustion engine exhaust gases comprise a particulate refractory oxide support, e.g., alumina particles, having an active catalytic phase deposited thereon, said active catalytic phase including zirconium, cerium and platinum, and optionally iridium, rhodium, palladium and other metal values.

Abstract: Multiple purpose catalysts adapted for the treatment of internal combustion engine exhaust gases comprise a particulate refractory oxide support, e.g., alumina particles, having an active catalytic phase deposited thereon, said active catalytic phase including zirconium, cerium and platinum, and optionally iridium, rhodium, palladium and other metal values.

Abstract: Carbon monoxide is reacted with water vapor and converted into hydrogen and carbon dioxide, in the presence of a thio-resistant catalyst which comprises an active phase deposited onto a support, said active phase comprising molybdenum, vanadium or tungsten, and a cobalt and/or nickel promoter therefor, and said support comprising cerium oxide or zirconium oxide. The reaction mixture advantageously includes carbon monoxide, hydrogen, water and compounds of sulfur, wherefrom hydrogen is selectively produced in increased amounts.

Abstract: Thermally stable, sulfur-resistant catalysts for the conversion of exhaust gases from internal combustion engines includes an inert, rigid support substrate, e.g., a cellular monolith, coated with a layer of porouse material, the porous material containing alumina, at least one rare earth oxide, and a spinel type compound having a specific surface of at least 50 m.sup.2 /g, and the support substrate having an effective amount of a catalytically active phase impregnated onto the porous coating thereof.

Abstract: Improvedly time-stable catalysts adopted for the treatment of internal combustion engine exhaust gases include a monolithic catalyst support impregnated with a plurality of catalytically active phases, one section of the support being impregnated with a first catalytically active phase and remaining section of the support being impregnated with a second catalytically active phase.

Abstract: Carbon monoxide is reacted with water vapor and converted into hydrogen and carbon dioxide, in the presence of a thio-resistant catalyst which comprises an active phase deposited onto a support, said active phase comprising molybdenum, vanadium or tungsten, and a cobalt and/or nickel promoter therefor, and said support comprising cerium oxide or zirconium oxide. The reaction mixture advantageously includes carbon monoxide, hydrogen, water and compounds of sulfur, wherefrom hydrogen is selectively produced in increased amounts.

Abstract: Carbon monoxide is reacted with water vapor and converted into hydrogen and carbon dioxide, in the presence of a thio-resistant catalyst which comprises an active phase deposited onto a support, said active phase comprising molybdenum, vanadium or tungsten, and a cobalt and/or nickel promoter therefor, and said support comprising cerium oxide or zirconium oxide. The reaction mixture advantageously includes carbon monoxide, hydrogen, water and compounds of sulfur, wherefrom hydrogen is selectively produced in increased amounts.

Abstract: The invention relates to a new hydrocarbon hydroconversion catalyst, which is a mixture of an amorphous matrix, a zeolite and at least one metal of Group VIII and optionally of Group VI, the zeolite having a SiO.sub.2 /Al.sub.2 O.sub.3 molar ratio of about between 8 and 70, a sodium content of less than 0.15% by weight, a unit mesh parameter a.sub..degree. of between 24.55 and 24.24.times.10.sup.-10 m, a sodium ion recovery capacity C.sub.Na, expressed in grams of sodium per 100 grams of modified zeolite, greater than 0.85, a specific surface area greater than 400 m.sup.2 g.sup.-1, a water vapor adsorption capacity at 25.degree. C. (with a P/Po ratio of 0.10) greater than 6% by weight, a pore distribution between 1 and 20% of the pore volume contained essentially in pores of diameters between 20 and 80.times.10.sup.-10m, the remaining pore volume being contained essentially in pores of diameters less than 20.times.10.sup.-10 m, the matrix being characterized by the following textural properties:S.gtoreq.

Abstract: A multifunctional pollution control catalyst for the treatment of exhaust gases from internal combustion engines is comprised of a catalyst support having an active catalytic phase deposited thereon, said active catalytic phase comprising catalytically effective amounts of (i) zirconium, (ii) cerium, (iii) palladium, (iv) iridium and/or rhodium, and, optionally, (v) iron.

Abstract: A composite active phase/support catalyst adapted for the treatment of internal combustion engine exhaust gases, the active phase of which comprising at least one metal from a first group comprising platinum, palladium, iridium, rhodium, ruthenium, rhenium, silver, gold or plurality thereof and at least one additional metal and the support therefor comprising binder/filler admixture, is facilely prepared by (i) intimately admixing the binder and filler support material with at least 50% by weight but less than all of said at least one first group metal, or precursor thereof, and/or of said at least one additional metal, (ii) forming the resulting admixture into catalyst shaped article, (iii) drying and optionally calcining said catalyst shaped article, (iv) incorporating the remainder of said at least one first group metal, or precursor thereof, and/or said at least one additional metal into said catalyst shaped article, and then (v) drying and activating the composite catalyst.

Abstract: The invention concerns a process for manufacturing a catalyst containing a carrier formed in major part of alumina and an active phase, the alumina carrier being obtained by admixing an alumina binding agent with a charge of alumina base.The process is characterized in that at least a portion of the active phase or of its precursor is introduced during the manufacture of the carrier so as to be present in the binding agent or in the charge before or during the admixture of the charge with the binding agent.The resultant catalyst may be used in reactions of hydrocarbons and carbon monoxide hydrogenation.

Abstract: The invention concerns a catalytic reforming process, operated in the presence of a catalyst containing a carrier formed in major part of alumina and an active phase, the alumina carrier being obtained by admixing an alumina binding agent with a charge of alumina base.At least a portion of the active phase or its precursor is introduced during the manufacture of the carrier, either in the binding agent or in the charge, during the admixture of the charge with a binding agent.

Abstract: Supported catalysts which are made by shaping catalyst carrier, with or without catalyst precursors, into balls, calcining the balls at 300.degree.-1000.degree. C., and crushing the calcined balls to particles whose average size is 0.2-0.8 times the average diameter of the balls. When the precursors are not present during the manufacture, they are added thereafter.

Abstract: A pollution control catalyst for a catalytic converter in the exhaust system of an internal combustion engine, which catalyst comprises a support impregnated with (i) at least one platinum group precious metal, and with (ii) cerium base metal, or a combination of cerium and at least one other base metal, is facilely prepared by (1) impregnating a catalyst support with precursor compounds of said cerium base metal, or of said cerium base metal and of at least one other base metal, (2) activating said impregnated support, under a neutral or oxidizing atmosphere, at a temperature ranging from 120.degree. to 800.degree. C.