(685d) Engineered Bifunctional Alloys for Chemical Looping Ammonia Synthesis
AIChE Annual Meeting
2022
2022 Annual Meeting
Catalysis and Reaction Engineering Division
Nitrogen Chemistry: Thermal/photo/plasma N2 reduction
Friday, November 18, 2022 - 9:00am to 9:20am
To evaluate this hypothesis, we used a theoretical framework to identify bifunctional alloys of hydrogen and nitrogen fixers, and an experimental framework to validate its performance in the following chemical loop:
Mx + H2 = MxH2, |
(R1) |
3My + N2 = M3yN2, |
(R2) |
3MxH2 + M3yN2 = 3Mx + 3My + 2NH3, |
(R3) |
where Mx and My represent a nitrogen and hydrogen fixing carrier, respectively. Bifunctional alloys of Mx and My were identified in the following series of steps diagramed in Figure 1. The proposed framework identified over 900 thermodynamically feasible bifunctional materials to synthesize ammonia in the chemical loop of R1-R3, of which less than 300 would make a stable alloy. From an extensive literature survey, many of the materials identified are supported in the literature as either being a catalyst, promoter, or support for ammonia synthesis. The theoretical framework developed in this work expanded the solution domain of potential solid carriers for CLAS over 150-fold, which can be used to accelerate development of a practical solution.