Minderung organischer Luftschadstoffemissionen durch Sorption/Katalyse. Teilvorhaben 5: Herstellung stabiler katalytischer Traegerwerkstoffe Schlussbericht

The removal of waste gases which contain harmful chlorinated hydrocarbons by catalytic cracking is interesting concerning of its low energy consumption. However, there are very high demands on the catalytic systems, especially on the supports regarding its acid resistance because the final products are among other things hydrogen chloride or unwelcome chloric gas. That's why porous sintered glass, ceramic pellets and wash-coated honeycombs with intermixed porous glass in microballs as well as pellets or porous glass only were used as supports. While the porous sintered glass and the supports of a ceramic base showed a very wide or bidisperse pore size distribution, the pellets of porous glass showed a very narrow one. The preparation of acid sites on the surface of the porous glass was subsequently performed by thermal treatment, chemical treatment with aluminium-salt-solution as well as by combination of both procedures. By NMR- measurement a tetrahedral coordination of the aluminium ion could be proved. Supports with double oxid layers, above all the combination Cr203/Al203 showed a noticeable increase of their catalytic activity. The creep behaviour is investigated in the moment by the Ritter company. (orig.)Available from TIB Hannover: F95B656+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman