Solar Ammonia Production via Novel Two-step Thermochemical Looping of a Co3Mo3N/Co6Mo6N pair [Slides]
- Arizona State Univ., Tempe, AZ (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Ternary nitrides in the family A3BxN (A=Co, Ni, Fe; B=Mo; x=2,3) identified and synthesized. Experiments with Co3Mo3N in Ammonia Synthesis Reactor demonstrate cyclable NH3 production from bulk nitride under pure H2. Production rates were approx. constant in all the reduction steps with no evident dependence on the consumed solid-state nitrogen up to formation of 661. Material can be re-nitridized under pure N2 (or 10% H2/N2). Bulk N utilization per reduction step averaged between 25 – 40% of the total (2-3 hours). Rate equations and parameters extracted from data. NH3 selectivity exceeds gas phase equilibrium at higher temperatures (in a large excess of H2). Selectivity begins to decrease significantly above 650 C, N2 production rapidly increases above 650 C seemingly due to reaction that is zero order in H2 (thermal reduction of the nitride?). Poised to begin the systematics studies of relationships between materials and reactions.
- 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:
- 2005302
- Report Number(s):
- SAND2022--13452C; 710420
- Country of Publication:
- United States
- Language:
- English
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