Kinetic and reaction engineering studies of dry reforming of methane over a Ni/La/Al{sub 2}O{sub 3} catalyst
- Sintef Applied Chemistry, Oslo (Norway)
- Ruhr-Univ. Bochum (Germany). Lehrstuhl fuer Technische Chemie
Kinetic studies of CO{sub 2} reforming of methane over a highly active Ni/La/{alpha}-Al{sub 2}O{sub 3} catalyst were performed in an atmospheric microcatalytic fixed-bed reactor. The reaction temperature was varied between 700 and 900 C, while partial pressures of CO{sub 2} and CH{sub 4} ranged from 16 to 40 kPa. From these measurements kinetic parameters were determined; the activation energy amounted to 90 kJ/mol. The rate of CO{sub 2} reforming was described by applying a Langmuir-Hinshelwood rate equation. The developed kinetics was interpreted with a two-phase model of a fluidized bed. The predictions for a bubbling-bed reactor operated with an undiluted feed (CH{sub 4}:CO{sub 2} = 1:1) at 800 C showed that, on an industrial scale, significantly longer contact times (H{sub mf} = 7.8 m, m{sub cat}/V{sub STP} = 31.8 g{center_dot}s{center_dot}ml) are necessary for achieving thermodynamic equilibrium (X{sub CH{sub 4}} = 88.2%, X{sub CO{sub 2}} = 93.6%). The performance of the reactor was strongly influenced by the interphase gas exchange: the highest space time yields were obtained for small particles (D{sub p} = 80 {micro}m).
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 603777
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 36, Issue 12; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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