Abstract: The invention concerns a method of removing substances present in water, in particular halogen-oxygen compounds which remain in the water as residues of disinfecting or are formed as by-products of oxidative water treatment. According to the invention, the substances present in water are removed by catalytic reduction in the presence of hydrogen on a supported precious metal catalyst.

Abstract: A process for regenerating a supported noble metal catalyst and also a process for catalytic treatment of wastewater containing, in particular, organohalogen contaminants, in which the process for regenerating the catalyst is a part of the overall wastewater treatment process.

Abstract: In a catalytic treatment process for effluents containing organic and inorganic compounds, a noble metal catalyst on a support is used. The support preferably is produced according to the sol-gel process.

Abstract: A process is described for producing a superconducting thick layer on a base material by thermally spraying a powder containing bismuth, lead, strontium, calcium and copper in oxidic form. First a powdered starting mixture is prepared which has a composition corresponding to the formula:Bi.sub.1.90-x Pb.sub.x Sr.sub.2-y Ca.sub.2.2-z Cu.sub.3.5-q O.sub.v,in which0.1.ltoreq.x.ltoreq.0.7,0.ltoreq.y.ltoreq.0.4,-0.5.ltoreq.z.ltoreq.+0.5,0.ltoreq.q.ltoreq.1.2 andv is the oxygen content calculated from the starting materials. Then the powder is heated for not less than 1 hour at a temperature of not less than 750.degree. C. in an oxygen-containing atmosphere and cooled again. The powder pre-reacted in this way is applied to a thermally stable substrate in a layer thickness of 0.5 to 7 mm by means of a burner by plasma-jet spraying or by flame spraying. The layer applied is then sintered for a time of not less than 40 hours at a temperature of 842.degree. to 848.degree. C. The layer is cooled to a temperature of 550.

Abstract: Enzymes are immboilized on an inorganic carrier which is a round, macropermeable agglomerate having a mulberry-type structure formed from spherical microporous .alpha.-aluminum oxide hydroxide particles. An organic polycondensate having free organic functional groups as enzyme binding sites penetrates the agglomerate. The .alpha.-aluminum oxide hydroxide particles of the agglomerate retain essentially their form prior to agglomeration. The polycondensate is prepared by reacting a polyimine with a dialdehyde or an epoxy compound. Preferably, the polyimine is polyethyleneimine, the dialdehyde is glutardialdehyde and the epoxy compound is an epoxy-functional silicon resin, an aliphatic diepoxide or an aliphatic triepoxide. The agglomerate is prepared by granulating the .alpha.-aluminum oxide hydroxide particles in the presence of the polyimine to form the agglomerate having the polyimine dispersed throughout and then reacting the polyimine with the dialdehyde or the epoxy compound.

Abstract: It is possible, by means of a flame-spraying or plasma-spraying technique adjusted to suit the particular properties of a plastic, not only to provide nonreinforced plastics with a uniform coating, but also to achieve an excellent hydrophilic surface wettability at the same time.

Abstract: Disclosed is process for the preparation of alumina-containing particles, comprising the steps of (a) mixing an aluminum oxide hydrosol containing a hydrate of alumina or activated alumina and an additive component selected from a high molecular weight natural organic material which is insoluble in aqueous solution up to a temperature of 50.degree. C. and carbon with a solution of hydrolyzable base to form a mixture; (b) introducing the mixture in dispersed form into a water-immiscible liquid having a temperature of from about 60 to 100.degree. C., whereby gel particles are formed; (c) aging the gel particles in the liquid at the temperature and subsequently in an aqueous ammonia solution; (d) recovering the aged particles; and (e) calcining the recovered particles.