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1997 (1)
1994 (1)
1Author    B. N. Sivasankar, S. GovindarajanRequires cookie*
 Title    Studies on Bis-hydrazine Complexes of Metal Propionates and Mixed Metal Propionates  
 Abstract    Metal propionate hydrazinates, M (C H 3C H 2 C O O)2 (N 2H4) 2 where M = Mn, Co, Ni, Zn or Cd, and mixed metal propionate hydrazinates with cobalt, M i^ Q ^ ^ C H ^ C I-^ C O O ^ ^ I-L t^ where M = Mg, Mn, Ni, Zn or Cd, have been prepared and characterized by analytical, magnetic, spectral, thermal and X-ray diffraction studies. The thermal decomposition of the former com plexes yields the metal oxides while the latter mixed metal complexes give the corresponding metal cobaltites as the final residue. Formation of metal cobaltites has been confirmed by TG weight loss, IR spectra and X-ray diffraction. 
  Reference    Z. Naturforsch. 49b, 950—9 (1994); received January 12 1994 
  Published    1994 
  Keywords    Metal Propionate Hydrazinates, Mixed M etal Propionate Hydrazinates, Mixed Metal Oxides, Cobaltites 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0950.pdf 
 Identifier    ZNB-1994-49b-0950 
 Volume    49 
2Author    Carsten Schinzer3, RiyadhA. Saym, HassanM. Asfour0Requires cookie*
 Title    Hydrogenation of Toluene over Lao.sSro^Fej.xCoxO^ Perovskite Catalysts  
 Abstract    The hydrogenation of toluene over perovskites of composition Lao.gSro.iFei-x Cox0 3 _ z (x = 0.0, 0.2, 0.5, 0.8 and 1.0) is reported. The catalyst material has been prepared by the coprecipitation method using maleic acid as the complexing agent. The activity for the gas phase reaction of toluene and hydrogen at temperatures between 50 °C to 300 °C is reported for as-prepared and activated materials. The conversion has been found to be nearly temperature-independent over the as-prepared per­ ovskites with a maximum o f 40% conversion found for a composition Lao.8Sro.2Feo.5Coo.5O 2.86-Activation by an oxygen treatment at 500 °C was successful to enhance the activity of the Co-rich perovskites. All of these catalysts show a complete conversion of toluene at 100 °C, but activity decreases by time due to a reduction of the catalyst material. Again, Lao.8Sro.2Feo.5Coo.5O2.86 exhibits the slowest loss of activity. A model for its special properties is mainly attributed to the p-type conduction behaviour. The conversion behaviour of the perovskite type catalysts investigated here is compared to the results obtained with noble-metal supported catalysts and it can be concluded, that the perovskites exhibit higher conversion rates, maximum temperatures and higher cracking onset temperatures than these. 
  Reference    Z. Naturforsch. 52b, 927—934 (1997); received April 11 1997 
  Published    1997 
  Keywords    Perovskites, Mixed Metal Oxides, Stability, Catalytic Hydrogenation, Catalytic Reduction 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0927.pdf 
 Identifier    ZNB-1997-52b-0927 
 Volume    52