Solar-Thermal Ammonia Production Via a Nitride Looping Cycle [Slides]
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Georgia Institute of Technology, Atlanta, GA (United States)
Solar Thermal Ammonia Production has the potential to synthesize ammonia in a green, renewable process that can greatly reduce the carbon footprint left by conventional Haber-Bosch reaction. Ternary nitrides in the family A3BxN (A=Co, Ni, Fe; B=Mo; x=2,3) have been identified as a potential candidate for NH3 production. Experiments with Co3Mo3N in Ammonia Synthesis Reactor demonstrate cyclable NH3 production from bulk nitride under pure H2. Production rates were fairly flat in all the reduction steps with no evident dependence on the consumed solid-state nitrogen, as would be expected from catalytic Mars-van Krevelen mechanism. Material can be re-nitridized under pure N2. Bulk nitrogen per reduction step average between 25 – 40% of the total solid-state nitrogen. Selectivity to NH3 stabilized at 55 – 60% per cycle. Production rates (NH3 and N2) become apparent above 600 °C at P(H2) = 0.5 – 2 bar. Optimal point of operation to keep selectivity high without compromising NH3 rates currently estimated at 650 °C and 1.5 - 2 bar. The next steps are to optimize production rates, examine effect of N2 addition in NH3 synthesis reaction, and test additional ternary nitrides.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; USDOE National Nuclear Security Administration (NNSA)
- DOE Contract Number:
- NA0003525
- OSTI ID:
- 2004385
- Report Number(s):
- SAND2022--11576C; 709173
- Country of Publication:
- United States
- Language:
- English
Similar Records
Metal nitride materials for solar-thermal ammonia production [Slides]
DFT Investigation of Ammonia Formation via a Langmuir–Hinshelwood Mechanism on Mo-Terminated δ-MoN(0001)