Neue heterogenisierte Komplexkatalysatoren und heterogene Katalysatoren auf Organopolysiloxan-Basis Abschlussbericht

The synthesis of immobilized metal complex catalysts via polycondensation of ligand functionalized metal complexes and the preparation of heterogeneous supported metal catalysts via adsorption/precipitation of metal salts on suitably functionalized polysiloxane supports are reported. The catalysts can be produced as microspheres for use in suspension, or as spheres having diameters of up to 2.0 mm, which are to be used in fixed-bed applications. Characteristic features of these catalysts are their high porosity, i.e. high pore volumes (2-3 ml/g), large pore diameters (> 20nm) and high BET surface areas. Applications of these catalysts in organic synthesis include selective hydrogenation of steroids, #alpha#, #beta#-unsaturated aldehydes, fatty acids, high molecular weight olefins, nitroaromatics and hydroformylation of especially long-chain olefins or unsaturated oligomers. The outstanding behavior of these unique catalysts is explained by their tailor-made chemical and structural composition and by the control of the physical characteristics, as are particle- and pore-size distribution, during synthesis of these materials. Whereas the availability of the immobilized metal complex catalysts is in the few kg-range, the synthesis of the supported precious metal catalysts on organopolysiloxane carriers has been scaled-up, to have them available in small technical quantities. (orig.)SIGLEAvailable from TIB Hannover: F95B1537+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Entwicklung eines Verfahrens zur Vermeidung von Verdampfungsverlusten von Legierungselementen beim Elektronenstrahlueberlaufschmelzen. Teilprojekt: Vorversuche im Elektronenstrahlofen und Entwicklung optimaler Prozessparameter Abschlussbericht

The attractive metallurgical capabilities of electron beam melting are oftenly jeopardized by uncontrollable selective evaporation losses of alloying elements. Procedures have been developed to avoid this disadvantage. Ni-Base-Alloys were melted under a slag of CaO-Al_2O_3 inside the EB-furnace. Cr-evaporation in IN 713 C could be lowered by 2/3. The remelted material was cleaner by 50% regarding nonmetallic inclusions. The experimental results of a pilot plant equipment could be reproduced on a production scale at Leybold-Durferrit, the project partner. In EB-melting of Platinum Group Metals the evaporating material is nearly completely hold back by condensation inside a water cooled copper-hood. Losses can be kept below 0,1% of throughput. This is an important result regarding EB-melting for platinum-metals too. Several applications are listed. (orig.)SIGLEAvailable from TIB Hannover: F95B2384+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Pruefstand und AMA-Fahrzeugtests zur Gewinnung von Leistungsdaten katalytischer Abgasreinigungssysteme unter europaeischen Testbedingungen Abschlussbericht. Abschlussdatum: 28.2.79

TIB: RN 8908 (79-033)+MF / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Evaluierung von getraegerten Edelmetallkatalysatoren, die aus Metallorganosolen praepariert wurden - Traegerfixierung und Einsatz fuer katalytische Reaktionen Abschlussbericht

SIGLEAvailable from TIB Hannover: DtF QN1(54,22) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Entwicklung neuer Flussmittel und Lotpasten zur Eliminierung von Waschprozessen mit FCKW in der Elektronikfertigung Zusammenfassender Abschlussbericht

Chlorofluorocarbons (CFCs) have been used for cleaning circuit boards after the soldering process in electronics manufacturing. The R and D-project aimed at the elimination of CFC-cleaning processes in electronics manufacturing. Therefore the development of new fluxes with low solid content was necessary which can remain on the boards after soldering because of their low residues. Basic research was performed on water-soluble solder pastes and on solder pastes for protective atmosphere soldering. Several new fluxes and solder pastes arised from the project. They are available on the marked or marked introduction is prepared. By using these new developed products the CFC-cleaning processes after soldering are no longer necessary. A method for testing and selecting solder pastes for reflow soldering of SMD-circuits has been developed and is available for industrial application. With the aim of avoiding CFC-cleaning processes in electronics manufacturing the project had an important environmental impactAvailable from TIB Hannover: D.Dt.F. QN1(7,50) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman