摘要:
Disclosed is a method for producing iridium oxide coatings, comprising the following steps: a) colloidal IrOx, wherein x represents a number from 1 to 2, is applied to a surface; b) the coated surface is dried; and c) the surface is burned at a temperature ranging between 300 and 1000 ° C. Steps a) to c) can be repeated until the desired layer thickness has been obtained. Using colloidal IrOx as an initial component for producing IrOx coatings prevents toxic gases from forming during burning process.
摘要翻译:公开了一种制备氧化铱涂层的方法,包括以下步骤:a)将胶体IrO x x,其中x表示1至2的数字施加到表面; b)将涂布表面干燥; 和c)表面在300和1000℃之间的温度下燃烧。可以重复步骤a)至c),直到获得所需的层厚度。 使用胶态IrO x x作为生产IrO x涂层的初始组分可防止在燃烧过程中形成有毒气体。
摘要:
The invention relates to heterogeneous catalysts which are particularly easy to produce. Said heterogeneous catalysts are generated by immobilizing preformed monometallic or multimetallic metal oxide particles in situ on an oxidic or non-oxidic carrier, wherefore metal oxide colloids which are stabilized by hydroxide ions and immobilized on carriers contained in the suspension are generated from conventional, water-soluble metal salts by means of hydrolysis and condensation. The inventive method makes it possible to produce fuel cell catalysts, for example.
摘要:
The invention relates to a process for the quasi-ionic polymerization of acrylic acid derivatives, in which the polymerization is initiated by using special mercaptosilanes as initiators in the presence of nucleophilic or electrophilic catalysts.
摘要:
The object of the invention is a method for the electrochemical preparation of metal colloids with particle sizes of less than 30 nm, characterized in that one or more metals of groups Ib, IIb, III, IV, V, VI, VIIb, VIII, lanthanoides, and/or actinoides of the periodic table are cathodically reduced in the presence of a stabilizer, optionally with a supporting electrolyte being added, in organic solvents or in solvent mixtures of organic solvents and/or water within a temperature range of between -78.degree. C. and +120.degree. C. to form metal colloidal solutions or redispersible metal colloid powders, optionally in the presence of inert substrates and/or soluble metal salts of the respective metals.The invention further relates to soluble or redispersible colloids as well as application on substrates and immobilization thereof, in particular for the preparation of catalysts.
摘要:
A process for anionic polymerization of acrylic and/or methacrylic acid derivatives or their ammonium salts with easily produced initiators. Specifically, the initiators are ammonium salts of resonance-stabilized nitrogen anions. The introduction of such initiators provides a maximum amount of structural variation, while inducing the controlled anionic polymerization of monomers at room temperature. The anionic polymerization is also applicable to acrylonitrile or methacrylonitrile or their derivatives. The polymerization process of the present invention provides polymers with definite molecular weight and limited molecular weight distribution.
摘要:
The invention relates to new optically active .alpha.-amino aldehydes of the formulae ##STR1## in which R.sub.1 represents an optionally substituted alkyl, alkenyl, aralkyl or aryl radical, andR.sub.2 and R.sub.3, independently of one another, denote an optionally substituted alkyl, alkenyl, cycloalkyl or aralkyl group, together form an optionally substituted phenylene-(1,2)-bis-methylene radical, or R.sub.2 is an optionally substituted, alkyl, cycloalkyl or aralkyl radical, and R.sub.3 forms together with R.sub.1 a 1,3-propylene radical.a process for the preparation thereof, and the use thereof for the stereoselective preparation of optically active .beta.-amino alcohols.
摘要:
The present invention relates to novel chiral 1,1′-ferrocenylene diphosphonites and the synthesis thereof, in addition to complexes of said compounds with metals from groups VIIb, VIIIb and Ib of the Periodic Table and to the use thereof for enantioselective hydrogenation of olefins, ketones and imines, or enantioselective hydroboration and 1,4-addition to activated olefins.
摘要:
A lithographic method for the generation of nanostructures on surfaces, characterized in that either stabilized nanometer-sized transition metal clusters or colloids of metals of groups 4, 5, 6, 7, 8, 9, 10, 11 or 12 of the Periodic Table, their stabilized metal oxide or metal sulfide analogues, polynuclear metal carbonyl clusters having stoichiometrically defined compositions, or polynuclear metal clusters having stoichiometrically defined compositions or having bridges consisting of main group elements, respectively in the form of a solution, are coated on a surface as a film which is imagewise exposed with an electron beam, wherein defined structures in the nanometer range are generated on the surface after washing off the unexposed portions of the film, optionally followed by annealing.
摘要:
A process for the preparation of immobilized lipases through reaction on a silica matrix containing non-hydrolyzable organic substituents attached through Si--C bonds.
摘要:
A method is described for the oxidation of organic compounds in which the organic compound that is to be oxidized is brought to reaction in an aqueous solution in the presence of cytochrome P 450, and wherein perfluorinated organic compound is added to the aqueous reaction mixture as activator.