摘要:
In the present invention, carbon monoxide in the hydrogen-containing gas is contacted with oxygen in the presence of a catalyst comprising platinum and at least one metal selected from the group consisting of cobalt, nickel, copper and manganese.
摘要:
There is disclosed a process for producing a hydrogen-containing gas, which comprises reacting methanol, steam and oxygen in the presence of (1) a catalyst comprising platinum and zinc oxide, wherein the content of the platinum is in the range of 5 to 50% by weight based on the total amount of the platinum and zinc oxide, or (2) a catalyst comprising platinum, zinc oxide and chromium oxide, wherein the atomic ratio of zinc to chromium (zinc/chromium) is in the range of 2 to 30, or (3) a catalyst comprising platinum, zinc oxide and at least one element selected from the group consisting of lead, bismuth and indium. Each of the catalysts has a high activity and is excellent in heat resistance and selectivity to steam-reforming reaction, and accordingly is capable of efficiently producing a reformed gas which is composed principally of hydrogen and is well suited for use in a fuel cell and the like by means of auto thermal reaction reaction, while lowering the concentration of carbon monoxide in a reformed hydrogen-containing gas.
摘要:
The present invention relates to a tooth bleaching material containing peroxyglutaric acid and/or peroxypolyacrylic acid as a bleaching ingredient, as well as a method of bleaching teeth which includes the step of applying the tooth bleaching material in the form of a dilute solution or without dilution onto surfaces of discolored teeth. In accordance with the present invention, there is provided a tooth bleaching material for bleaching and removing colored sediments (colored or discolored deposits) on teeth which does not essentially require irradiation with light, and is readily used with a high safety and further suitable as a domestic bleaching material, as well as a tooth bleaching method using the above tooth bleaching material.
摘要:
The present invention relates to a tooth bleaching material containing peroxyglutaric acid and/or peroxypolyacrylic acid as a bleaching ingredient, as well as a method of bleaching teeth which include the step of applying the tooth bleaching material in the form of a dilute solution or without dilution onto surfaces of discolored teeth. In accordance with the present invention, there are provided a tooth bleaching material for bleaching and removing colored sediments (colored or discolored deposits) on teeth which do not essentially require irradiation with light, and is readily used with a high safety and further suitable as a domestic bleaching material, as well as a tooth bleaching method using the above tooth bleaching material.
摘要:
This invention provides a method for high efficiency, high concentration production of hydrogen peroxide wherein oxygen and hydrogen are reacted in the reaction medium in the presence of a catalyst comprising a metallic or carrier supported platinum group metal catalyst onto which an organic halogen compound which is insoluble in water, which compound excludes compounds which contain no halogen other than fluorine, has been adsorbed or a platinum group metal catalyst supported on a carrier in which a halogenated organic compound, which compound excludes compounds that contain no halogen other than fluorine, has been adsorbed to the carrier prior to supporting the platinum group metal. Since it is not necessary for halogen ions to be present in the reaction medium as it was in the prior art, the problems of deterioration due to the dissolution of the catalyst and of corrosion of the structural materials of the reaction vessel are alleviated.
摘要:
There is disclosed a process for producing a hydrogen-containing gas, which comprises reacting methanol, steam and oxygen in the presence of a catalyst comprising palladium, zinc and at least one metal selected from the group consisting of chromium, gallium, copper, indium, bismuth and platinum. That is to say, the process include the following four aspects: (I) a process which comprises reacting methanol, steam and oxygen in the presence of a catalyst comprising palladium, zinc, and either or both of chromium and gallium; (II) a process which comprises reacting methanol, steam and oxygen in the presence of a catalyst comprising palladium, zinc, copper and chromium; (III) a process which comprises reacting methanol, steam and oxygen in the presence of a catalyst comprising palladium and zinc, or chromium added thereto optionally, and either or both of indium and bismuth; and (IV) a process which comprises reacting methanol, steam and oxygen in the presence of a catalyst comprising zinc oxide, palladium and platinum. The use of the above steam-reforming catalyst having a high activity, high selectivity and sufficient durability makes it possible to produce a hydrogen-containing gas which is composed principally of hydrogen and minimized in CO concentration in an industrially advantageous manner through an auto thermal reformer where methanol, steam and oxygen are reacted with one another.
摘要:
A dispersion of reactive polymer particles obtained by polymerization of monomer in an organic liquid which dissolves the monomer but does not dissolve a polymer formed from the monomer, in the presence of a dispersion stabilizer composed of a high molecular weight polymer; characterized in that (i) said dispersion stabilizer is a high molecular weight polymer which is obtained by polymerization of an ethylenically unsaturated monomer and soluble in the above organic liquid and which contains a chemically reactive group (A); that (ii) said polymer particles are particles of a high molecular weight polymer which are obtained by polymerization of an ethylenically unsaturated monomer and contain a complementary chemically reactive group (B) capable of mutually reacting with the chemically reactive group (A); and that (iii) the chemically reactive group (A) and the chemically reactive group (B) are present stably in the dispersion. This dispersion is useful in coating compositions such as an adhesive, coating, etc.
摘要:
It is intended to provide an organic peracid polymer composition which is stable, odorless and has sufficient water solubility and is suitably used as a bactericide, a bleaching agent and a cleaning agent. By mixing and dissolving an organic acid polymer, hydrogen peroxide and an inorganic acid and maintaining the mixture for a period ranging from 1 hour to 1 month at a temperature ranging from 10 to 80° C., the organic peracid polymer-containing composition containing an organic peracid polymer (2 to 50% by weight) and, in some cases, the hydrogen peroxide (2 to 50% by weight) and the inorganic acid (0.1 to 10% by weight) is obtained.
摘要:
Oxygen and hydrogen are catalytically reacted in an acidic reaction medium in the presence of a platinum group metal catalyst to prepare hydrogen peroxide using as a carrier for the platinum group metal catalyst a composite oxide containing cerium. The process need not halogen ions in the acidic reaction medium and enables preparation of hydrogen peroxide in high concentration on an industrial scale advantageously.
摘要:
A method for producing a high concentration of hydrogen peroxide by reacting oxygen and hydrogen directly in a reaction medium containing a promoter such as a halogen containing compound using a platinum group metal catalyst supported on a solid acid carrier or a solid super acid carrier.