Thermodynamic evaluation of hydrogen production modes during pyrolysis of ammonia in a filtration combustion moving bed reactor

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Abstract

A new process has been proposed for pyrolysis of ammonia in a filtration combustion moving bed reactor to produce hydrogen. The process can be implemented in reactors with energy recovery with separate supply of reagents (including swiss-roll reactor, etc.). The mass-energy balance of the process was calculated. The analysis of pyrolysis products was carried out under the condition of thermodynamic equilibrium with varying temperature and pressure. The system pressure varied from 1 to 10 bar. The temperature range from 300 to 1100 K was considered. It has been shown that ammonia pyrolysis ends at a temperature of 620 K at atmospheric pressure. An increase in pressure in the system led to a slight increase in the temperature of ammonia pyrolysis. The portion of hydrogen that needs to be burned to cover the energy for heating and pyrolysis of the initial ammonia in the case of an adiabatic reactor was 0.13. From one mole of ammonia it is possible to obtain 1.31 moles of hydrogen.

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About the authors

E. A. Salgansky

FRC Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

Author for correspondence.
Email: sea@icp.ac.ru
Russian Federation, Chernogolovka

M. V. Salganskaya

FRC Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

Email: sea@icp.ac.ru
Russian Federation, Chernogolovka

I. V. Sedov

FRC Problems of Chemical Physics and Medicinal Chemistry of the Russian Academy of Sciences

Email: sea@icp.ac.ru
Russian Federation, Chernogolovka

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2. Fig. 1. Scheme of a filtration combustion reactor with a moving bed of coolant with separate supply of reagents.

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3. Fig. 2. Dependences of the volumetric content of gaseous products of ammonia pyrolysis (1 – NH3, 2 – H2, 3 – N2) on temperature at different pressures: a – 1, b – 5, c – 10 bar.

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4. Fig. 3. Dependence of the temperature of complete pyrolysis of ammonia (T*) on pressure (P).

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