Synthesis of Ammonia Directly from Air and Water via a Single-Chamber Reactor Using Lanthanum Chromite-Based Composite as an Electrocatalyst

2021 ◽  
Vol 32 ◽  
pp. 35-44
Author(s):  
Ibrahim A. Amar ◽  
Mohammed M. Ahwidi
Keyword(s):  
Noble Metal ◽  
Ammonia Synthesis ◽  
Direct Synthesis ◽  
Formation Rate ◽  
Lanthanum Chromite ◽  
Ammonia Production ◽  
Faradaic Efficiency ◽  
Single Chamber ◽  
Promising Technology ◽  
Ammonia Formation

Carbon-free electrosynthesis of ammonia using water (H2 source) and air (N2 source) is promising technology to reduce the global CO2 emission resulting from the industrial ammonia production process (Haber-Bosch). In this study, electrocatalysis activity of non-noble metal perovskite-based catalyst (La0.75Sr0.25Cr0.5Fe0.5O3-δ-Ce0.8Gd0.18Ca0.02O2-δ, LSCrF-CGDC) for ammonia synthesis directly from air and water was explored. Ammonia was successfully from wet air (3%H2O) synthesized in a single-chamber type reactor. The highest ammonia formation rate and Faradaic efficiency of about 1.94×10-11 mol s-1 cm-2 and 2.01% were achieved at 375 oC and 1.2 V, respectively. The observed ammonia formation rate is higher than reported for an expensive noble metal-based catalyst (Ru/MgO). The obtained results indicated that the direct synthesis of ammonia from air and water is a promising technology for green and sustainable ammonia synthesis.

Electrocatalytic Activity of Lanthanum Chromite-Based Composite Cathode for Ammonia Synthesis from Water and Nitrogen

2021 ◽  
Vol 1160 ◽  
pp. 65-74
Author(s):  
Ibrahim A. Amar ◽  
Mohammed M. Ahwidi
Keyword(s):  
Noble Metal ◽  
Electrocatalytic Activity ◽  
Ammonia Synthesis ◽  
Formation Rate ◽  
Sol Gel ◽  
Composite Cathode ◽  
Perovskite Oxide ◽  
Synthesis Process ◽  
Lanthanum Chromite ◽  
Faradaic Efficiency

The electrocatalytic ammonia synthesis using water (along with nitrogen) as a hydrogen source is proposed as an alternative green and clean technology to the energy-intensive and CO2-emitting process (Haber-Bosch) for ammonia production. Besides, a selective electrocatalyst for ammonia synthesis versus the competing hydrogen evolution remains elusive. This study aims to investigate the electrocatalytic activity of non-noble metal Co and Fe-free perovskite oxide-based composite cathode (La0.75Sr0.25Cr0.5Mn0.5O3-δ-Ce0.8Gd0.18Ca0.02O2-δ) towards ammonia synthesis from H2O and N2. The electrocatalyst was synthesized via a sol-gel process and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Ammonia was successfully with a maximum formation rate of 2.5 × 10-10 mol s-1 cm-2 and Faradaic efficiency of 0.52% at 400 oC and applied voltage of 1.4 V. The results demonstrated that the proposed non-noble metal-based electrocatalyst is a promising material for the carbon-free ammonia synthesis process.

Effective electrode design and the reaction mechanism for electrochemical promotion of ammonia synthesis using Fe-based electrode catalysts

2021 ◽  
Vol 5 (1) ◽  
pp. 188-198
Author(s):  
Chien-I. Li ◽  
Hiroki Matsuo ◽  
Junichiro Otomo
Keyword(s):  
High Temperature ◽  
Reaction Mechanism ◽  
Ammonia Synthesis ◽  
Formation Rate ◽  
Electrochemical Promotion ◽  
Electrode Design ◽  
Fe Catalyst ◽  
High Ammonia ◽  
Very High ◽  
Ammonia Formation

Effective electrode design is investigated and a very high ammonia formation rate via EPOC is achieved using the Fe catalyst at high temperature.

Ruminal ammonia formation in relation to the protein requirement of sheep: III. Ruminal ammonia formation with various diets

1954 ◽  
Vol 44 (3) ◽  
pp. 270-273 ◽  
Author(s):  
E. F. Annison ◽  
Margaret I. Chalmers ◽  
S. B. M. Marshall ◽  
R. L. M. Synge
Keyword(s):  
Ammonia Production ◽  
Protein Requirement ◽  
Groundnut Meal ◽  
Rich Material ◽  
Protein Rich ◽  
Ammonia Formation

1. Ruminal ammonia concentrations were measured in sheep receiving basal diets of hay and meals with various supplementary sources of protein. Ammonia production from groundnut meal was great and from maize products slight. Herring meal behaved in an intermediate way.2. The extent of ammonia production from a given amount of protein-rich material was decreased when the amount of starch or cereal meal fed at the same time was increased.

A review on research progress in the direct synthesis of hydrogen peroxide from hydrogen and oxygen: noble-metal catalytic method, fuel-cell method and plasma method

2016 ◽  
Vol 6 (6) ◽  
pp. 1593-1610 ◽  
Author(s):  
Yanhui Yi ◽  
Li Wang ◽  
Gang Li ◽  
Hongchen Guo
Keyword(s):  
Hydrogen Peroxide ◽  
Fuel Cell ◽  
Noble Metal ◽  
Direct Synthesis ◽  
Research Progress ◽  
Pd Catalyst ◽  
Catalytic Method ◽  
Plasma Method ◽  
Cell Method ◽  
Plasma Methods

The direct synthesis of H2O2 from H2 and O2 using Pd catalyst, fuel cell and plasma methods have been reviewed systematically.

Ethanol direct synthesis from dimethyl ether and syngas on the combination of noble metal impregnated zeolite with Cu/ZnO catalyst

2014 ◽  
Vol 232 ◽  
pp. 22-26 ◽  
Author(s):  
Peng Lu ◽  
Guohui Yang ◽  
Yuki Tanaka ◽  
Noritatsu Tsubaki
Keyword(s):  
Dimethyl Ether ◽  
Noble Metal ◽  
Direct Synthesis

Ammonia synthesis at intermediate temperatures in solid-state electrochemical cells using cesium hydrogen phosphate based electrolytes and noble metal catalysts

2017 ◽  
Vol 42 (43) ◽  
pp. 26843-26854 ◽  
Author(s):  
Shota Kishira ◽  
Geletu Qing ◽  
Shuya Suzu ◽  
Ryuji Kikuchi ◽  
Atsushi Takagaki ◽  
...  
Keyword(s):  
Solid State ◽  
Noble Metal ◽  
Ammonia Synthesis ◽  
Metal Catalysts ◽  
Electrochemical Cells ◽  
Hydrogen Phosphate ◽  
Noble Metal Catalysts

Electrocatalytic activity of CoFe1.9Mo0.1O4-Ce0.8Gd0.18Ca0.02O2-δ composite cathode for ammonia synthesis from water and nitrogen

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ibrahim A. Amar ◽  
Mohammed M. Ahwidi
Keyword(s):  
Applied Voltage ◽  
Formation Rate ◽  
Sol Gel ◽  
Area Measurement ◽  
Content Type ◽  
Factors Affecting ◽  
Bet Specific Surface Area ◽  
Surface Area Measurement ◽  
Ammonia Formation ◽  
Double Chamber

Purpose This paper aims to investigate the electrocatalytic activity of CoFe1.9Mo0.1O4-Ce0.8Gd0.18Ca0.02O2-δ composite (CFMo-CGDC) for the direct synthesis of ammonia from H2O and N2 under atmospheric pressure. Designs CoFe1.9Mo0.1O4 nanoparticles (CFMo NPs) were synthesized via a sol-gel method. CFMo NPs were characterized using X-ray diffraction (XRD), Brunauer–Emmet–Teller (BET) specific surface area measurement and scanning electron microscope (SEM). Double-chamber reactor was used to synthesize ammonia using H2O and N2 as precursors. The factors affecting the ammonia formation rate (applied voltage and temperature) were studied. Findings CoFe1.9Mo0.1O4 nanoparticles (CFMo NPs) were synthesized via a sol-gel method. CFMo NPs were characterized using XRD, Brunauer–Emmet–Teller (BET) specific surface area measurement and SEM. Double-chamber reactor was used to synthesize ammonia using H2O and N2 as precursors. The factors affecting the ammonia formation rate (applied voltage and temperature) were studied. Originality/value The usage of CFMo-CGDC composite as an electrocatalyst for the synthesis of ammonia directly from H2O and N2.

Defect-rich fluorographene nanosheets for artificial N2 fixation under ambient conditions

2019 ◽  
Vol 55 (29) ◽  
pp. 4266-4269 ◽  
Author(s):  
Jinxiu Zhao ◽  
Jiajia Yang ◽  
Lei Ji ◽  
Huanbo Wang ◽  
Hongyu Chen ◽  
...  
Keyword(s):  
N2 Fixation ◽  
Formation Rate ◽  
Ambient Conditions ◽  
Faradaic Efficiency ◽  
Metal Free

Defect-rich fluorographene behaves as a metal-free catalyst for the artificial conversion of N2 to NH3 at ambient conditions. In 0.1 M Na2SO4, it achieves a faradaic efficiency (FE) of 4.2% with an NH3 formation rate (RNH3) of 9.3 μg h−1 mgcat.−1 at −0.7 V vs. RHE, with strong long-term electrochemical durability.

The direct synthesis of a bio-lubricant by the oligomerization of methyllinoleate via castor oil

2019 ◽  
Vol 21 (24) ◽  
pp. 6658-6666 ◽  
Author(s):  
Wenjie Xue ◽  
Lei Shi ◽  
Xinqing Chen ◽  
Minghuang Qiu ◽  
Cunhui Zhou ◽  
...  
Keyword(s):  
Noble Metal ◽  
Castor Oil ◽  
Direct Synthesis ◽  
Maximum Yield ◽  
Mo Catalyst

A non-noble metal (Mo) catalyst for the oligomerization of methyllinoleate via castor oil was successfully prepared to directly synthesize bio-lubricatant oil. The obtained oligomers were produced at a maximum yield of 70.8%.

scholarly journals Over 56.55% Faradaic efficiency of ambient ammonia synthesis enabled by positively shifting the reaction potential

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Mengfan Wang ◽  
Sisi Liu ◽  
Tao Qian ◽  
Jie Liu ◽  
Jinqiu Zhou ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Faradaic Efficiency ◽  
Reaction Potential
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