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Catalytic combustion of ammonia over platinum: Multiple temperature regimes and intricate pressure dependence
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DOI：10.1016/j.combustflame.2026.115035.png)
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Abstract
En 中文
This study experimentally investigates the reaction kinetics of catalytic NH3 combustion over polycrystalline Pt catalysts at temperatures up to 700 K and pressures of 1–6 bar, using wire microcalorimetry, product analysis, and in situ spectroscopic experiments. Three distinct temperature-dependent reaction stages were identified, characterized by shifts in selectivity among N2, N2O, NO and NO2, resulting in a non-monotonic heat release at any given pressure. Beyond the temperature effects, a complex pressure dependence was observed: elevated pressures delayed light-off and alternately suppressed or promoted reactivity depending on temperature, leading to a non-monotonic pressure dependence of heat release rate in certain temperature ranges. Product distributions also exhibited pressure-dependent trends, with deeper oxidation to N2O and NO2 favored at higher pressures. In contrast, the formation of N2/NO shifted from monotonically decreasing/increasing with pressure at temperatures below ∼600 K to increasing/decreasing at higher temperatures. These findings reveal intricate temperature- and pressure-dependent kinetics in catalytic NH3 combustion, providing insights for the design of practical ammonia-based energy conversion and emission control systems.
Keywords:
catalytic NH3 combustion
platinum catalysts
reaction kinetics
temperature dependence
pressure dependence
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6.2
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9.5K
Citations:
4.2W
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