Recent progress in electrochemical synthesis of ammonia from nitrogen: strategies to improve the catalytic activity and selectivity

2021 ◽  
Author(s):  
Bing Yang ◽  
Weilu Ding ◽  
Honghua Zhang ◽  
Suojiang Zhang
Keyword(s):  
Catalytic Activity ◽  
Electrochemical Synthesis ◽  
Recent Progress ◽  
Catalytic Systems ◽  
Electrochemical Synthesis Of Ammonia

A systematic summary of strategies to improve the performance of electrochemical NRR catalysts and NRR catalytic systems.

Catalytic Activity of Binary and Triple Systems Based on Redox Inactive Metal Compound, LiSt and Additives of Monodentate Ligands-Modifiers: DMF, HMPA and PhOH, in Selective Ethylbenzene Oxidation with Dioxygen

2016 ◽  
Vol 10 (3) ◽  
pp. 259-270
Author(s):  
Ludmila Matienko ◽  
◽  
Larisa Mosolova ◽  
Vladimir Binyukov ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Triple System ◽  
Metal Compound ◽  
Ethylbenzene Oxidation ◽  
Catalytic Systems ◽  
Triple Systems ◽  
Lithium Compound ◽  
Mechanism Of Catalysis ◽  
Monodentate Ligands

Mechanism of catalysis with binary and triple catalytic systems based on redox inactive metal (lithium) compound {LiSt+L2} and {LiSt+L2+PhOH} (L2=DMF or HMPA), in the selective ethylbenzene oxidation by dioxygen into -phenylethyl hydroperoxide is researched. The results are compared with catalysis by nickel-lithium triple system {NiII(acac)2+LiSt+PhOH} in selective ethylbenzene oxidation to PEH. The role of H-bonding in mechanism of catalysis is discussed. The possibility of the stable supramolecular nanostructures formation on the basis of triple systems, {LiSt+L2+PhOH}, due to intermolecular H-bonds, is researched with the AFM method.

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

Hydrogen peroxide decomposition on a two-component CuO-Cr2O3 catalyst

1988 ◽  
Vol 53 (8) ◽  
pp. 1636-1646 ◽  
Author(s):  
Viliam Múčka ◽  
Kamil Lang
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Activity ◽  
Extreme Values ◽  
Catalytic Properties ◽  
Active Components ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Peroxide Decomposition ◽  
Two Component ◽  
Catalytically Active

Some physical and catalytic properties of the two-component copper(II)oxide-chromium(III)oxide catalyst with different content of both components were studied using the decomposition of the aqueous solution of hydrogen peroxide as a testing reaction. It has been found that along to both basic components, the system under study contains also the spinel structure CuCr2O4, chromate washable by water and hexavalent ions of chromium unwashable by water. The soluble chromate is catalytically active. During the first period of the reaction the equilibrium is being established in both homogeneous and heterogeneous catalytic systems. The catalytic activity as well as the specific surface area of the washed solid is a non-monotonous function of its composition. It seems highly probable that the extreme values of both these quantities are not connected with the detected admixtures in the catalytic system. The system under study is very insensitive with regard to the applied doses of gamma radiation. Its catalytic properties are changed rather significantly after the thermal treatment and particularly after the partial reduction to low degree by hydrogen. The observed changes of the catalytic activity of the system under study are very probably in connection with the changes of the valence state of the catalytically active components of the catalyst.

Ru-doped barium strontium titanates of the cathode for the electrochemical synthesis of ammonia

2019 ◽  
Vol 339 ◽  
pp. 115010 ◽  
Author(s):  
Hwan Kim ◽  
Yong Sik Chung ◽  
Taewook Kim ◽  
Heechul Yoon ◽  
Jae Gi Sung ◽  
...  
Keyword(s):  
Electrochemical Synthesis ◽  
Barium Strontium ◽  
Electrochemical Synthesis Of Ammonia

scholarly journals Electrochemical synthesis of ammonia using a proton conducting solid electrolyte and nickel cermet electrode

2017 ◽  
Vol 125 (4) ◽  
pp. 252-256 ◽  
Author(s):  
Naohiro SHIMODA ◽  
Yusuke KOBAYASHI ◽  
Yutaka KIMURA ◽  
Go NAKAGAWA ◽  
Shigeo SATOKAWA
Keyword(s):  
Solid Electrolyte ◽  
Electrochemical Synthesis ◽  
Proton Conducting ◽  
Electrochemical Synthesis Of Ammonia

Chromium Oxynitride Electrocatalysts for Electrochemical Synthesis of Ammonia Under Ambient Conditions

Small Methods ◽  
2018 ◽  
Vol 3 (6) ◽  
pp. 1800324 ◽  
Author(s):  
Yao Yao ◽  
Qi Feng ◽  
Shangqian Zhu ◽  
Jiadong Li ◽  
Yuze Yao ◽  
...  
Keyword(s):  
Electrochemical Synthesis ◽  
Ambient Conditions ◽  
Electrochemical Synthesis Of Ammonia

Anion-exchange-membrane-based electrochemical synthesis of ammonia as a carrier of hydrogen energy

2018 ◽  
Vol 35 (8) ◽  
pp. 1620-1625 ◽  
Author(s):  
Jong Hyun Park ◽  
Hyung Chul Yoon ◽  
Jong-Nam Kim ◽  
Chan-Hee Jeong ◽  
Eun-Young Jeong ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Electrochemical Synthesis ◽  
Anion Exchange Membrane ◽  
Hydrogen Energy ◽  
Electrochemical Synthesis Of Ammonia ◽  
Exchange Membrane

S-Doped three-dimensional graphene (S-3DG): a metal-free electrocatalyst for the electrochemical synthesis of ammonia under ambient conditions

2020 ◽  
Vol 49 (7) ◽  
pp. 2258-2263 ◽  
Author(s):  
Jin Wang ◽  
Shuang Wang ◽  
Jinping Li
Keyword(s):  
Electrochemical Synthesis ◽  
Three Dimensional ◽  
Ambient Conditions ◽  
3D Graphene ◽  
Metal Free ◽  
Electrochemical Synthesis Of Ammonia

3D-graphene provide abundant space for N2, and the carbon–sulfur bonds provides a continuous supply of electrons for N2 reduction. A remarkably large NH3 yield of 38.81 μgNH3 mgcat−1 h−1 and FE of 7.72% for N2 reduction was obtained.

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