Partial oxidation of methane to synthesis gas over (Ca,Sr) (Ti,Ni) oxides

✍ Scribed by K. Takehira; T. Hayakawa; H. Harihara; A.G. Andersen; K. Suzuki; M. Shimizu

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 461 KB
• Volume: 24
• Category: Article
• ISSN: 0920-5861
• DOI: 10.1016/0920-5861(95)00031-a

✦ Synopsis

Ni catalysts supported on perovskite were in situ prepared from Cal _ xSrxTil _ yNiyO precursors and were tested in the oxidation of CH4 by increasing reaction temperature from room temperature to 800°C. Nit originally separated from the perovskite structure under sol-gel preparation conditions was reduced to Ni metal during the CH4 oxidation and thus formed Ni metal supported on perovskite showed high activity for synthesis gas production at 800°C. This process involves first the oxidation of a part of CH4 to H20 and CO2 followed by the reforming reaction of CH4 with H20 and CO2. When the catalyst of y = 0.2 was used, high Sr contents afforded high activity for the CH4 oxidation and the highest activity to synthesis gas was obtained with x = 0.2. In the catalysts of x = 0.2, those of y > 0.1 showed high activity for the synthesis gas production, that of y = 0.05 required pretreatment with CI-L for acquiring the activity and a further decrease in the Ni content resulted in no activity. Ni catalyst prepared by impregnation over the perovskite carrier showed a high activity, while those prepared by mixing metal oxides were not active. It is thus most likely that perovskite structure possesses an important role as the carrier in Ni catalysts.