Abstract
Alumina-supported Ni and/or Ru catalysts were prepared and their ability to decompose ammonia in simulated coal-derived gas fuel from 250 to 900 °C using a conventional fixed-bed flow reactor at atmospheric and high pressure (0.9 MPa) was tested. The surface properties of the catalysts were investigated using BET, CO chemisorption, XRD, and TPD after NH 3 adsorption. Supported Ni catalyst promoted NH 3 decomposition to N 2 above 700 °C with and without oxygen addition in the fuel. Supported Ni catalyst had the potential to decompose NH 3 to N 2 from 400 to 550 °C with the addition of a small amount of oxygen in the fuel, while the addition of Ru significantly reduced the potential. Ni selectively promotes NH 3 oxidation to N 2 at low temperature, while Ru selectively promotes H 2 oxidation to H 2 O .
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