Reduced nitrogen hydride complexes of a cofacial metallodiporphyrin and their oxidative interconversion. An analysis of ammonia oxidation and prospects for a dinitrogen electroreduction catalyst based on cofacial metallodiporphyrins

1992 ◽  
Vol 114 (21) ◽  
pp. 8074-8080 ◽  
Author(s):  
James P. Collman ◽  
James E. Hutchison ◽  
Matthew S. Ennis ◽  
Michel Angel Lopez ◽  
Roger Guilard
Keyword(s):  
Ammonia Oxidation ◽  
Hydride Complexes ◽  
Nitrogen Hydride ◽  
Reduced Nitrogen

scholarly journals Nitrification Process in a Nuclear Wastewater with High Load of Nitrogen, Uranium and Organic Matter under ORP Controlled

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1607
Author(s):  
Mariano Venturini ◽  
Ariana Rossen ◽  
Patricia Silva Paulo
Keyword(s):  
Ammonia Oxidation ◽  
High Load ◽  
Nuclear Fuels ◽  
Monod Model ◽  
Nernst Equation ◽  
Nitrification Process ◽  
Real Wastewater ◽  
High Concentrations ◽  
Wastewater Samples ◽  
Very High

To produce nuclear fuels, it is necessary to convert uranium′s ore into UO2-ceramic grade, using several quantities of kerosene, methanol, nitric acid, ammonia, and, in low level, tributyl phosphate (TBP). Thus, the effluent generated by nuclear industries is one of the most toxic since it contains high concentrations of dangerous compounds. This paper explores biological parameters on real nuclear wastewater by the Monod model in an ORP controlled predicting the specific ammonia oxidation. Thermodynamic parameters were established using the Nernst equation to monitor Oxiders/Reductors relationship to obtain a correlation of these parameters to controlling and monitoring; that would allow technical operators to have better control of the nitrification process. The real nuclear effluent is formed by a mixture of two different lines of discharges, one composed of a high load of nitrogen, around 11,000 mg/L (N-NH4+-N-NO3−) and 600 mg/L Uranium, a second one, proceeds from uranium purification, containing TBP and COD that have to be removed. Bioprocesses were operated on real wastewater samples over 120 days under controlled ORP, as described by Nernst equations, which proved to be a robust tool to operate nitrification for larger periods with a very high load of nitrogen, uranium, and COD.

Manganese‐Catalyzed Ammonia Oxidation into Dinitrogen under Chemical or Electrochemical Conditions

ChemPlusChem ◽  
2021 ◽  
Author(s):  
Hiroki Toda ◽  
Kaito Kuroki ◽  
Ryoichi Kanega ◽  
Shogo Kuriyama ◽  
Kazunari Nakajima ◽  
...  
Keyword(s):  
Ammonia Oxidation

Ruthenium(II) Complexes with N-Heterocyclic Carbene-Phosphine Ligands for the N-Alkylation of Amines with Alcohols

2021 ◽  
Author(s):  
Ming Huang ◽  
Yinwu Li ◽  
Xiao-Bing Lan ◽  
Jiahao Liu ◽  
Cunyuan Zhao ◽  
...  
Keyword(s):  
Metal Hydride ◽  
Phosphine Ligands ◽  
Hydride Complexes ◽  
Borrowing Hydrogen ◽  
Hydrogen Autotransfer

Metal hydride complexes are key intermediates for N-alkylation of amines with alcohols by borrowing hydrogen/hydrogen autotransfer (BH/HA) strategy. Reactivity tuning of metal hydride complexes could adjust the dehydrogenation of alcohols...

scholarly journals How Surface Species Drive Product Distribution during Ammonia Oxidation: An STM and Operando APXPS Study

ACS Catalysis ◽  
2021 ◽  
pp. 8261-8273
Author(s):  
Oleksii Ivashenko ◽  
Niclas Johansson ◽  
Christine Pettersen ◽  
Martin Jensen ◽  
Jian Zheng ◽  
...  
Keyword(s):  
Ammonia Oxidation ◽  
Product Distribution ◽  
Surface Species

scholarly journals Synthesis and Catalytic Reactivity of Cobalt Pincer Nitrosyl Hydride Complexes

2021 ◽  
Author(s):  
Jan Pecak ◽  
Sarah Fleissner ◽  
Luis F. Veiros ◽  
Ernst Pittenauer ◽  
Berthold Stöger ◽  
...  
Keyword(s):  
Hydride Complexes ◽  
Nitrosyl Hydride ◽  
Catalytic Reactivity

scholarly journals Activation of ammonia and hydrazine by electron rich Fe(ii) complexes supported by a dianionic pentadentate ligand platform through a common terminal Fe(iii) amido intermediate

2021 ◽  
Author(s):  
Lucie Nurdin ◽  
Yan Yang ◽  
Peter G. N. Neate ◽  
Warren E. Piers ◽  
Laurent Maron ◽  
...  
Keyword(s):  
Transition Metal ◽  
Ammonia Oxidation ◽  
Oxidation Processes ◽  
Pentadentate Ligand

Synopsis: a highly reactive Fe(iii)–NH2 complex is generated via activation of ammonia or hydrazine in reactions of relevance to fundamental steps in ammonia oxidation processes mediated by an abundant, first row transition metal.

scholarly journals Straw mulching and nitrogen application altered ammonia oxidizers communities and improved soil quality in the alkaline purple soil of southwest China

AMB Express ◽  
2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Songhe Chen ◽  
Rencai Gao ◽  
Xiaoling Xiang ◽  
Hongkun Yang ◽  
Hongliang Ma ◽  
...  
Keyword(s):  
Soil Quality ◽  
Ammonia Oxidation ◽  
Management Strategies ◽  
Rflp Analysis ◽  
Available Phosphorus ◽  
Purple Soil ◽  
Ammonia Oxidizers ◽  
Nitrogen Application ◽  
Available Nitrogen ◽  
Straw Mulching

AbstractMicrobe-mediated ammonia oxidation is a key process in soil nitrogen cycle. However, the effect of maize straw mulching on the ammonia oxidizers in the alkaline purple soil remains largely unknown. A three-year positioning experiment was designed as follows: straw mulching measures as the main-plot treatment and three kinds of nitrogen application as the sub-plot treatment. We found the contents of soil organic carbon (SOC), total nitrogen (TN), available potassium (AK), available nitrogen (AN), available phosphorus (AP), and NH4+-N were increased after straw mulching and nitrogen application in alkaline purple soil, so did the amoA genes abundance of ammonia-oxidizing archaeal (AOA) and bacterial (AOB). Terminal restriction fragment length polymorphism (T-RFLP) analysis revealed that Thaumarchaeote (448-bp T-RF) was dominated the AOA communities, whereas Nitrosospira sp (111-bp T-RF) dominated the AOB communities. The community compositions of both AOA and AOB were altered by straw mulching and nitrogen application in alkaline purple soil, however, the AOB communities was more responsive than AOA communities to the straw mulching and nitrogen application. Further analysis indicated that SOC and AP were the main factors affecting the abundance and community compositions of AOA and AOB in alkaline purple soil. The present study reported that straw mulching and nitrogen strategies differently shape the soil ammonia oxidizers community structure and abundance, which should be considered when evaluating agricultural management strategies regarding their sustainability and soil quality.

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