Ammonia Production via a Two-Step Al2O3/AlN Thermochemical Cycle. 1. Thermodynamic, Environmental, and Economic Analyses

The production of ammonia via a two-step cyclic process is proposed as an alternative to its conventional production by the Haber−Bosch process. The first endothermic step is the production of AlN by carbothermal reduction of Al2O3 in a N2 atmosphere at above 1500 °C. The second exothermic step is t...

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Veröffentlicht in:Industrial & engineering chemistry research 2007-03, Vol.46 (7), p.2042-2046
Hauptverfasser: Gálvez, M. E, Halmann, M, Steinfeld, A
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Halmann, M
Steinfeld, A
description The production of ammonia via a two-step cyclic process is proposed as an alternative to its conventional production by the Haber−Bosch process. The first endothermic step is the production of AlN by carbothermal reduction of Al2O3 in a N2 atmosphere at above 1500 °C. The second exothermic step is the steam-hydrolysis of AlN to produce NH3 and reform Al2O3; the latter is recycled to the first step. Both reaction steps proceed at 1 bar, without added catalysts, and bypass the energy-intensive production of hydrogen, resulting in significant fuel and cost savings. Furthermore, the endothermic reduction step could be carried out using concentrated solar energy as the source of high-temperature process heat, eliminating concomitant CO2 emissions derived from fossil-fuelled processes.
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title Ammonia Production via a Two-Step Al2O3/AlN Thermochemical Cycle. 1. Thermodynamic, Environmental, and Economic Analyses
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