scholarly journals Nitrogenase Bioelectrocatalysis: ATP-Independent Ammonia Production Using a Redox Polymer/MoFe Protein System

ACS Catalysis ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 6854-6861 ◽  
Author(s):  
Yoo Seok Lee ◽  
Mengwei Yuan ◽  
Rong Cai ◽  
Koun Lim ◽  
Shelley D. Minteer
Keyword(s):  
Ammonia Production ◽  
Redox Polymer ◽  
Mofe Protein ◽  
Protein System

scholarly journals Electroenzymatic Nitrogen Fixation Using a MoFe Protein System Immobilized in an Organic Redox Polymer

2020 ◽  
Vol 59 (38) ◽  
pp. 16511-16516 ◽  
Author(s):  
Yoo Seok Lee ◽  
Adrian Ruff ◽  
Rong Cai ◽  
Koun Lim ◽  
Wolfgang Schuhmann ◽  
...  
Keyword(s):  
Nitrogen Fixation ◽  
Redox Polymer ◽  
Mofe Protein ◽  
Protein System

scholarly journals Excitation-Rate Determines Product Stoichiometry in Photochemical Ammonia Production by CdS Quantum Dot-Nitrogenase MoFe Protein Complexes

ACS Catalysis ◽  
2020 ◽  
Vol 10 (19) ◽  
pp. 11147-11152
Author(s):  
Katherine A. Brown ◽  
Jesse Ruzicka ◽  
Hayden Kallas ◽  
Bryant Chica ◽  
David W. Mulder ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Protein Complexes ◽  
Ammonia Production ◽  
Excitation Rate ◽  
Mofe Protein ◽  
Cds Quantum Dot

Chemical Transformation of Fe, Air & Water to Ammonia: Variation of Reaction Rate with Temperature, Pressure, Alkalinity and Iron

2018 ◽  
Author(s):  
Ping Peng ◽  
Fang-Fang Li ◽  
Xinye Liu ◽  
Jiawen Ren ◽  
jessica stuart ◽  
...  
Keyword(s):  
Particle Size ◽  
Reaction Rate ◽  
Electrolyte Concentration ◽  
Iron Concentration ◽  
Reaction Medium ◽  
Iron Particle ◽  
Intermediate Step ◽  
Ammonia Production ◽  
Pure Nitrogen ◽  
Alkaline Reaction

The rate of ammonia production by the <u>chemical </u>oxidation of iron, N<sub>2</sub>(from air or as pure nitrogen) and water is studied as a function of (1) iron particle size, (2) iron concentration, (3) temperature, (4) pressureand (5) concentration of the alkaline reaction medium. The reaction meduium consists of an aqueous solution of equal molal concentrations of NaOH and KOH (Na<sub>0.5</sub>K<sub>0.5</sub>OH). We had previously reported on the <u>chemical </u>reaction of iron and nitrogen in alkaline medium to ammonia as an intermediate step in the <u>electrochemical </u>synthesis of ammonia by a nano-sized iron oxide electrocatlyst. Here, the intermediate <u>chemical </u>reaction step is exclusively explored. The ammonia production rate increases with temperature (from 20 to 250°C), pressure (from 1 atm to 15 atm of air or N<sub>2</sub>), and exhibits a maximum rate at an electrolyte concentration of 8 molal Na<sub>0,5</sub>K<sub>0,5</sub>OH in a sealed N<sub>2</sub>reactor. 1-3 µm particle size Fe drive the highest observed ammonia production reaction rate. The Fe mass normalized rate of ammonia production increases with decreasing added mass of the Fe reactant reaching a maximum observed rate of 2.2x10<sup>-4</sup>mole of NH<sub>3</sub>h<sup>-1</sup>g<sup>-1</sup>for the reaction of 0.1 g of 1-3 µm Fe in 200°C 8 molal Na<sub>0.5</sub>K<sub>0.5</sub>OH at 15 atm. Under these conditions 5.1 wt% of the iron reacts to form NH<sub>3</sub>via the reaction N<sub>2</sub>+ 2Fe + 3H<sub>2</sub>O ®2NH<sub>3</sub>+ Fe<sub>2</sub>O<sub>3</sub>.

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