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1998 (2)
1Author    Bor-Jih Lee, Shigeo Kitsukawa, Hidemoto Nakagawa, Shukuji Asakura, Kenzo FukudaRequires cookie*
 Title    The Partial Oxidation of Methane to Methanol with Nitrite and Nitrate Melts  
 Abstract    The effect of reduced oxygen species on the partial oxidation of methane to methanol was examined with nitrite melts. The experimental results support the suggestion that the formation of methanol or C2 compounds depends on different reduced oxygen species, as observed in our previous work using nitrate melts. It has been suggested that the partial oxidation of methane proceeds to CH3OH or C2 compounds via parallel pathways. This suggestion was verified by increasing the oxygen concentration to carry out the partial oxidation of methane in 25 mol% NaNC>3 -75 mol% KNO3 melts. A methanol selectivity of 8.2% and a methanol yield of 0.43% were observed with CH4/O 2 = 15/1 at 575 °C, whereas with CH4/O 2 = 7/1 methanol selectivity and yield increased to 23.7% and 1.1%, respectively. The results further confirm the contribution of the superoxide ion O 2-on methanol formation. 
  Reference    Z. Naturforsch. 53b, 679—682 (1998); received February 26 1998 
  Published    1998 
  Keywords    Superoxide Ion, Nitrite, Nitrate, Partial Oxidation, Methanol 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0679.pdf 
 Identifier    ZNB-1998-53b-0679 
 Volume    53 
2Author    Z. NaturforschRequires cookie*
 Title    The Promotive Properties of Alkali Metal Nitrate Melts for the Partial Oxidation of Methane to Methanol  
 Abstract    B o r-Jih L ee, S higeo K itsu k aw a, S h u k u ji A sa k u ra * , K en z o F u k u d a D epartm ent (Na, K)N 0 3 melts of various ratios were used as prom oters for the partial oxidation of methane to methanol. Experiments were perform ed in a flow reactor system under atmo­ spheric pressure and at various tem peratures in the range of 525-600 °C. The influence of reaction temperature, melt composition, and reduced oxygen species on m ethane conversion and methanol selectivity were investigated systematically. The major reaction products were CH 3O H, CO, C 0 2, and trace amounts of C2H 6 and C2H 4. A m ethane conversion of 1.8-12.4% and a methanol selectivity of 0.4-14.1% were obtained under these reaction condi­ tions. Binary melts could achieve higher m ethanol selectivity than a single melt. The amounts of reduced oxygen species 0 2~ and 0 22-were estimated from thermochemical data according to the ion equilibrium in molten nitrates. The promotive effect of nitrate melts was confirmed and the results indicate that superoxide 0 2~ plays an im portant role for methanol formation. 
  Reference    Z. Naturforsch. 53b, 249—255 (1998); received O ctober 7 1997 
  Published    1998 
  Keywords    Partial Oxidation, Conversion, Selectivity, Molten Salt, Reduced Oxygen Species 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0249.pdf 
 Identifier    ZNB-1998-53b-0249 
 Volume    53