Abstract
An internally circulating fluidized-bed (ICFB) reactor (i.d.eff = 1.9 cm, Hriser = 10 and 20 cm, respectively) was applied to investigate the catalytic partial oxidation of methane to synthesis gas over Ni/α-Al2O3 (Ni loading, 1 and 5 wt %; particle diameter, 71−160 and 250−355 μm). The experiments were performed at 800 °C by applying a methane to oxygen ratio of 2:1. The contact times in the draft tube (≪ 0.1 g·s·mL-1) were sufficient to obtain nearly thermodynamic equilibrium values for the methane conversion (XCH4,eq = 92%) and selectivities to hydrogen (SH2,eq = 97%) and carbon dioxide (SCO,eq = 97%). The achieved results indicate the general suitability of an ICFB reactor for the partial oxidation of methane to synthesis gas. However, stable and controllable reactor operation with sufficient solids circulation through the draft tube was possible only over a narrow range of gas velocities (0.75−1.50 m·s-1). Furthermore, the conversion and selectivities were strongly influenced by the temperature distr...
Published Version
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