Formation of biogenic iron-oxide nodules in reducing sediments as an analogue of near-field redox reaction products

2006 ◽  
Vol 31 (10-14) ◽  
pp. 593-599 ◽  
Author(s):  
H. Dora Yoshida ◽  
K. Yamamoto ◽  
Y. Murakami ◽  
K. Matsuoka
Keyword(s):  
Iron Oxide ◽  
Redox Reaction ◽  
Near Field ◽  
Reaction Products ◽  
Biogenic Iron

Biogenic iron oxide nanoparticles and activated sodium persulphate for hydrocarbon remediation in contaminated soil

2021 ◽  
pp. 101719
Author(s):  
Oladotun P. Bolade ◽  
Anuoluwa A. Akinsiku ◽  
Oluwatobi S. Oluwafemi ◽  
Akan B. Williams ◽  
Nsikak U. Benson
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Contaminated Soil ◽  
Oxide Nanoparticles ◽  
Biogenic Iron

Research into Thermocatalytic Propane-to-Propylene Synthesis Using Iron-Containing Composite Carbon Materials

2021 ◽  
pp. 100-114
Author(s):  
E.B. Markova ◽  
A.G. Cherednichenko ◽  
L.S. Akhmedova ◽  
Yu.M. Averina ◽  
Yu.M. Serov
Keyword(s):  
Carbon Nanotubes ◽  
Iron Oxide ◽  
Service Life ◽  
Oil And Gas ◽  
Carbon Matrix ◽  
Propane Conversion ◽  
Reaction Products ◽  
Chemical Production ◽  
Catalytic Systems ◽  
Propylene Selectivity

The development of modern thermocatalytic technologies for processing oil and gas raw materials is one of the promising areas for the advancement of chemical production. New highly efficient catalytic systems with the required technical characteristics and long service life play an essential role in solving these issues. The paper focuses on obtaining propylene by selective propane dehydrogenation. In the course of the experiments, composite iron-containing catalysts were synthesized, in which the active component is iron oxide in combination with an inert carbon matrix. FAS activated carbon and carbon nanotubes were used as the matrix. As a result of the synthesis on the catalyst surface it was possible to obtain catalytic centers that transfer electrons by changing the degree of iron oxidation when converting the starting materials into the target reaction products. Findings of research show that the obtained iron-containing catalysts significantly increase the efficiency of the process in comparison with the efficiency of thermal cracking of propane. Thus, the Fe3+/FAS catalyst showed a conversion rate of the initial reagent of 68 % and a propylene selectivity of about 42 %. Further transition to catalytic systems based on singlelayer and double-layer carbon nanotubes modified with iron oxide (Fe3+/CNTI and Fe3+/CNTII) made it possible to obtain propane conversion up to 37--40 % with a decrease in propylene selectivity to 29--30 %. Studies of the service life of the synthesized catalytic systems and the possibility of their regeneration show that, with account for the regeneration, the activity of the catalysts and the main technical characteristics of the propane-to-propylene cracking process remain unchanged for 10 working cycles

Hydrogen Storage and Release by Redox Reaction of Iron Oxide Medium with Mo and Zr Additives

2011 ◽  
Vol 347-353 ◽  
pp. 3317-3320 ◽  
Author(s):  
Young Ho Kim ◽  
Han Sol Je ◽  
Eun Jee Kang ◽  
Su Gyung Lee ◽  
Chu Sik Park
Keyword(s):  
Iron Oxide ◽  
Hydrogen Storage ◽  
Atmospheric Pressure ◽  
Redox Reaction ◽  
Hydrogen Reduction ◽  
Fixed Bed ◽  
Urea Solution ◽  
Redox Cycles ◽  
Chemical Hydrogen Storage ◽  
Theoretical Amount

Chemical hydrogen storage and release of iron-based oxide mediums were investigated by hydrogen reduction and water splitting oxidation (Fe3O4 + 4H2 ⇌ 3Fe + 4H2O). In this study, all metal oxide mediums were prepared by coprecipitation method using urea solution as precipitant. The redox reactions of the mediums were conducted using a fixed bed quartz reactor under atmospheric pressure. The theoretical amount of hydrogen storage that can be obtained from the redox reaction of iron oxide is calculated to be 4.8wt% on the basis of 1g-Fe. However, in case of using the iron oxide medium without additives, the medium was rapidly deactivated due to the agglomeration of Fe metals in the hydrogen reduction step of repeated redox cycles. In this study, therefore, Mo and Zr additives were added to iron oxide to improve the reactivity of the medium and to prevent the agglomeration of that. As a result, the reactivity for oxidation of the mediums was largely improved with the addition of Mo additive. It was concluded that change in the valence of Mo cations affected the redox behavior of the mediums.

scholarly journals The influence of carbon additive on the electrochemical behaviors of Fe2O3/C electrodes in alkaline solution

2018 ◽  
Vol 56 (1) ◽  
pp. 24
Author(s):  
Trinh Tuan Anh ◽  
Doan Ha Thang ◽  
Bui Thi Hang
Keyword(s):  
Iron Oxide ◽  
Electrochemical Properties ◽  
Alkaline Solution ◽  
Redox Reaction ◽  
Composite Electrode ◽  
Binder Content ◽  
Fe2o3 Nanoparticles ◽  
Active Materials ◽  
Electrochemical Behaviors ◽  
Air Battery

Acetylene Black (AB) and Fe2O3 nanoparticles were used as the additive and active materials, respectively for preparing Fe2O3/AB composite electrode. The effects of carbon additive and binder content on the electrochemical properties of Fe2O3/AB electrodes in alkaline solution were investigated to find the suitable anode for the Fe/air battery. The results of electrochemical measurements showed that both the AB additive and binder content significantly affected on the electrochemical behaviors of Fe2O3/AB electrodes. AB additive improves in redox reaction of iron oxide.

Effect of Redox Reaction Products on the Luminescence Switching Behavior in CePO4:Tb Nanorods

2013 ◽  
Vol 117 (19) ◽  
pp. 10031-10038 ◽  
Author(s):  
Guozhu Chen ◽  
Haiguang Zhao ◽  
Federico Rosei ◽  
Dongling Ma
Keyword(s):  
Redox Reaction ◽  
Switching Behavior ◽  
Reaction Products

The Decolorizing of High Iron Containing Soda-Lime Silicate Glass by Annealing Process

2016 ◽  
Vol 702 ◽  
pp. 130-134 ◽  
Author(s):  
Ekarat Meechoowas ◽  
Parida Jampeerung ◽  
Kanit Tapasa ◽  
Tepiwan Jitwatcharakomol
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Iron Oxide ◽  
Redox Reaction ◽  
Soda Lime ◽  
Annealing Process ◽  
Silicate Glasses ◽  
High Iron ◽  
Vis Spectroscopy ◽  
Soda Lime Silicate Glass

The tableware soda-lime silicate glasses, contained with 0.06 wt% of iron oxide, which were annealed at different times and temperatures, were investigated by UV-Vis spectroscopy. The glasses were produced from high iron sand. The iron content was twice as high in the glasses as it is in normal tableware glasses. The redox reaction of iron around glass transition temperature, Fe2+(green) ↔ Fe3+(yellow), was found in the annealing process, according to the redox reaction of iron with polyvalent ions in the glass, nFe3+ + Ma+ ↔ nFe2+ + M(a+-n) where M is the polyvalent ion in glass. In this study, the glasses were prepared by melting in a platinum crucible. After casting, they were annealed with variable times and temperatures. The results of color in CIE L*a*b* system and Fe2+/Fe3+ ratio of glasses showed the effect of the annealing process on the redox reaction of iron. The decolorizing was found during the annealing process. The results of this work led to the method for controlling the effect of iron oxide in the glass and the possibility to use high iron sand to produce tableware glasses.Tableware glass, Iron oxide, Redox reaction, Decolorizing

Utilization of tea resources with the production of superparamagnetic biogenic iron oxide nanoparticles and an assessment of their antioxidant activities

2021 ◽  
Vol 278 ◽  
pp. 123962
Author(s):  
Rajiv Periakaruppan ◽  
Xuan Chen ◽  
Kuberan Thangaraj ◽  
Anburaj Jeyaraj ◽  
Hoang Ha Nguyen ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Antioxidant Activities ◽  
Oxide Nanoparticles ◽  
Biogenic Iron
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