Kinetics of ammonia decomposition in hot gas cleaning

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Reduction in the amount of ammonia in fuel gas from biomass gasification was studied. Experiments were carried out in a fixed-bed reactor dt 200-1000 degrees C, 21 atm. A kinetic model for ammonia decomposition was developed. The partial pressure of hydrogen in the fuel gas was a key factor to model ammonia decomposition. Activation energies in the empty reactor, on carbon, and in a sand bed were similar, 130-140 kJ/mol. The frequency factors for carbon and sand were 10 times as large as for the empty reactor. The activation energy for a Ni-based catalyst was 111-113 kJ/mol. Carbon deposit deactivated the Ni-based catalyst. High temperature was found to be essential for avoiding carbon fouling and for achieving high ammonia removal efficiency. Estimation of the ammonia reduction for fuel gas showed that a moderate amount of ammonia could be removed by use of the Ni-based pellets at 800 degrees C.


  • Wuyin Wang
  • N Padban
  • ZC Ye
  • Arne Andersson
  • Ingemar Bjerle
Enheter & grupper

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Kemiteknik
Sidor (från-till)4175-4182
TidskriftIndustrial & Engineering Chemistry Research
Utgåva nummer11
StatusPublished - 1999
Peer review utfördJa