Surface Iron Species in Palladium–Iron Intermetallic Nanocrystals that Promote and Stabilize CO 2 Methanation

2020 ◽  
Vol 132 (34) ◽  
pp. 14542-14550
Author(s):  
Laihao Luo ◽  
Menglin Wang ◽  
Yi Cui ◽  
Ziyuan Chen ◽  
Jiaxin Wu ◽  
...  
Keyword(s):  
Iron Species ◽  
Surface Iron ◽  
Iron Intermetallic

scholarly journals Frontispiz: Surface Iron Species in Palladium–Iron Intermetallic Nanocrystals that Promote and Stabilize CO 2 Methanation

2020 ◽  
Vol 132 (34) ◽  
Author(s):  
Laihao Luo ◽  
Menglin Wang ◽  
Yi Cui ◽  
Ziyuan Chen ◽  
Jiaxin Wu ◽  
...  
Keyword(s):  
Iron Species ◽  
Surface Iron ◽  
Iron Intermetallic

scholarly journals Frontispiece: Surface Iron Species in Palladium–Iron Intermetallic Nanocrystals that Promote and Stabilize CO 2 Methanation

2020 ◽  
Vol 59 (34) ◽  
Author(s):  
Laihao Luo ◽  
Menglin Wang ◽  
Yi Cui ◽  
Ziyuan Chen ◽  
Jiaxin Wu ◽  
...  
Keyword(s):  
Iron Species ◽  
Surface Iron ◽  
Iron Intermetallic

Surface Iron Species in Palladium–Iron Intermetallic Nanocrystals that Promote and Stabilize CO 2 Methanation

2020 ◽  
Vol 59 (34) ◽  
pp. 14434-14442 ◽  
Author(s):  
Laihao Luo ◽  
Menglin Wang ◽  
Yi Cui ◽  
Ziyuan Chen ◽  
Jiaxin Wu ◽  
...  
Keyword(s):  
Iron Species ◽  
Surface Iron ◽  
Iron Intermetallic

Tracking high-valent surface iron species in the oxygen evolution reaction on cobalt iron (oxy)hydroxides

2021 ◽  
Author(s):  
Seunghwa Lee ◽  
Aliki Moysiadou ◽  
You-Chiuan Chu ◽  
Hao Ming Chen ◽  
Xile Hu
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Renewable Electricity ◽  
Iron Species ◽  
Iron Oxyhydroxides ◽  
Surface Iron ◽  
Cobalt Iron ◽  
High Valent

The oxygen evolution reaction (OER) is the bottleneck reaction of water splitting, which can be used to generate green hydrogen from renewable electricity. Cobalt iron oxyhydroxides (CoFeOxHy) are among the...

Enhanced CH4 and CO Oxidation over Ce1–xFexO2−δ Hybrid Catalysts by Tuning the Lattice Distortion and the State of Surface Iron Species

2019 ◽  
Vol 11 (21) ◽  
pp. 19227-19241 ◽  
Author(s):  
Danyang Li ◽  
Kongzhai Li ◽  
Ruidong Xu ◽  
Xing Zhu ◽  
Yonggang Wei ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Lattice Distortion ◽  
The State ◽  
Iron Species ◽  
Hybrid Catalysts ◽  
Surface Iron

scholarly journals Possibilities of predicting undesirable iron intermetallic phases in secondary Al-alloys

2021 ◽  
Vol 55 ◽  
pp. 797-804
Author(s):  
Ivana Švecová ◽  
Eva Tillová ◽  
Lenka Kuchariková ◽  
Vidžaja Knap
Keyword(s):  
Intermetallic Phases ◽  
Al Alloys ◽  
Iron Intermetallic

scholarly journals Turbidity Changes during Carbamazepine Oxidation by Photo-Fenton

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 894
Author(s):  
Natalia Villota ◽  
Cristian Ferreiro ◽  
Hussein A. Qulatein ◽  
Jose M. Lomas ◽  
Jose Ignacio Lombraña
Keyword(s):  
Ferric Hydroxide ◽  
Coordination Complexes ◽  
Strong Increase ◽  
H2o2 Concentration ◽  
Iron Species ◽  
Ph Values ◽  
Carboxylic Groups ◽  
Main Decomposition ◽  
High Turbidity ◽  
Catalyst Dosage

The objective of this study is to evaluate the turbidity generated during the Fenton photo-reaction applied to the oxidation of waters containing carbamazepine as a function of factors such as pH, H2O2 concentration and catalyst dosage. The results let establish the degradation pathways and the main decomposition byproducts. It is found that the pH affects the turbidity of the water. Working between pH = 2.0 and 2.5, the turbidity is under 1 NTU due to the fact that iron, added as a catalyst, is in the form of a ferrous ion. Operating at pH values above 3.0, the iron species in their oxidized state (mainly ferric hydroxide in suspension) would cause turbidity. The contribution of these ferric species is a function of the concentration of iron added to the process, verifying that the turbidity increases linearly according to a ratio of 0.616 NTU L/mg Fe. Performing with oxidant concentrations at (H2O2) = 2.0 mM, the turbidity undergoes a strong increase until reaching values around 98 NTU in the steady state. High turbidity levels can be originated by the formation of coordination complexes, consisting of the union of three molecules containing substituted carboxylic groups (BaQD), which act as ligands towards an iron atom with Fe3+ oxidation state.

scholarly journals Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

Soil Systems ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 22
Author(s):  
Sara Gonzalez-Rodriguez ◽  
Maria Luisa Fernandez-Marcos
Keyword(s):  
Laboratory Experiments ◽  
Sorption Isotherms ◽  
Soil Samples ◽  
Mineral Surfaces ◽  
Volcanic Soils ◽  
Iron Species ◽  
Freundlich Model ◽  
Equatorial Africa ◽  
Relevant Role ◽  
Icp Mass Spectrometry

Sorption of oxyanions by soils and mineral surfaces is of interest due to their role as nutrients or pollutants. Volcanic soils are variable charge soils, rich in active forms of aluminum and iron, and capable of sorbing anions. Sorption and desorption of vanadate, arsenate, and chromate by two African andosols was studied in laboratory experiments. Sorption isotherms were determined by equilibrating at 293 K soil samples with oxyanion solutions of concentrations between 0 and 100 mg L−1 V, As, or Cr, equivalent to 0−2.0 mmol V L−1, 0−1.3 mmol As L−1, and 0−1.9 mmol Cr L−1, in NaNO3; V, As, or Cr were determined by ICP-mass spectrometry in the equilibrium solution. After sorption, the soil samples were equilibrated with 0.02 M NaNO3 to study desorption. The isotherms were adjusted to mathematical models. After desorption with NaNO3, desorption experiments were carried out with a 1 mM phosphate. The sorption of vanadate and arsenate was greater than 90% of the amount added, while the chromate sorption was much lower (19–97%). The sorption by the Silandic Andosol is attributed to non-crystalline Fe and Al, while in the Vitric Andosol, crystalline iron species play a relevant role. The V and Cr sorption isotherms fitted to the Freundlich model, while the As sorption isotherms conformed to the Temkin model. For the highest concentrations of oxyanions in the equilibrating solution, the sorbed concentrations were 37–38 mmol V kg−1, 25 mmol As kg−1, and 7.2–8.8 mmol Cr kg−1. The desorption was low for V and As and high for Cr. The comparison of the sorption and desorption isotherms reveals a pronounced hysteresis for V in both andosols and for Cr in the Silandic Andosol. Phosphate induced almost no V desorption, moderate As desorption, and considerable Cr desorption.

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