A study of iron modification of the alumina-supported Pt/SO4/ZrO2 catalysts for isomerization of n-hexane

A series of FeOx-MnO2-CeO2 catalysts were synthesized by the surfactant-templated coprecipitation method and applied for HCHO removal. The influence of Fe/Mn/Ce molar ratio on the catalytic performance was investigated, and the FeOx-MnO2-CeO2 catalyst exhibited excellent catalytic activity, with complete HCHO conversion at low temperatures (40 °C) when the molar ratio of Fe/Mn/Ce was 2/5/5. The catalysts were characterized by N2 adsorption and desorption, XRD, H2-TPR, O2-TPD and XPS techniques to illustrate their structure–activity relationships. The result revealed that the introduction of FeOx into MnO2-CeO2 formed a strong interaction between FeOx-MnO2-CeO2, which facilitated the improved dispersion of MnO2-CeO2, subsequently increasing the surface area and aiding pore development. This promotion effect of Fe enhanced the reducibility and produced abundant surface-active oxygen. In addition, a great number of Oα is beneficial to the intermediate decomposition, whereas the existence of Ce3+ favors the formation of oxygen vacancies on the surface of the catalyst, all of which contributed to HCHO oxidation at low temperatures.

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Effect of Iron Modification on the Adsorption Property of Nitrogen Monoxide on Zeolite Y

Journal of the Ceramic Society of Japan ◽

10.2109/jcersj.106.79 ◽

1998 ◽

Vol 106 (1229) ◽

pp. 79-83 ◽

Cited By ~ 1

Author(s):

Yukichi SASAKI ◽

Toshiyuki SUZUKI ◽

Isao TATEYAMA ◽

Yukari ISIKAWA ◽

Akira SAJI ◽

...

Keyword(s):

Zeolite Y ◽

Adsorption Property ◽

Nitrogen Monoxide ◽

Iron Modification

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Electromagnetic Performance due to Tooth-tip Design in Fractional-slot PM Brushless Machines

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v6.i4.pp860-868 ◽

2015 ◽

Vol 6 (4) ◽

pp. 860

Author(s):

Mohd Luqman Mohd Jamil ◽

Zulfikri Zaki Zolkapli ◽

Auzani Jidin ◽

Raja Nor Firdaus Raja Othman ◽

Tole Sutikno

Keyword(s):

Double Layer ◽

Great Influence ◽

Single Layer ◽

Torque Ripple ◽

Element Analysis ◽

Cogging Torque ◽

Torque Density ◽

Iron Modification ◽

Winding Machine ◽

Electromagnetic Performance

Permanent Magnet (PM) machines are favorable as an alternative to other machine topologies due to simpler construction and high torque density. However, it may result hight torque ripple due to an influence of cogging torque and electronic commutation. In this paper, comparisons of phase back-emf, static torque and cogging torque due to influence of tooth-tip asymmetry in 12-slot/10-pole double-layer and 12-slot/10-pole single layer winding machines are carried out using 2D Finite-Element Analysis. At rated condition, the stator asymmetry has great influence on the torque performance as there is significant reduction of torque ripple in 12-slot/10-pole mahine equipped with single layer winding than one equipped with double layer winding machine. It si confirmed that an optimum torque performance is desirable via stator iron modification in PM machines.

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INTRAFORM CAST-IRON MODIFICATION. IMPACT STUDIES OF SILICON CARBIDE MODIFIERS ON CRYTALLIZATION OF GREY IRON. REPORT 1

Izvestiya Ferrous Metallurgy ◽

10.17073/0368-0797-2014-6-20-24 ◽

2015 ◽

Vol 57 (6) ◽

pp. 20

Author(s):

V. A. Poluboyarov ◽

Z. A. Korotaeva ◽

A. A. Zhdanok ◽

V. A. Kuznetzov ◽

N. V. Stepanova

Keyword(s):

Silicon Carbide ◽

Cast Iron ◽

Impact Studies ◽

Iron Modification ◽

Grey Iron

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Iron Modification of Biochar Developed from Tectona grandis Linn. F. for Adsorptive Removal of Tetracycline from Aqueous Solution

Analytical Chemistry Letters ◽

10.1080/22297928.2021.1934113 ◽

2021 ◽

Vol 11 (3) ◽

pp. 360-375

Author(s):

Anushree Srivastava ◽

Hemen Dave ◽

Shivesh Kumar Azad ◽

Madhu Kumari ◽

Sharad Karwal ◽

...

Keyword(s):

Aqueous Solution ◽

Tectona Grandis ◽

Adsorptive Removal ◽

Iron Modification

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Mechanical Behaviour of Nanostructured Iron Fabricated by Severe Plastic Deformation under Diffusion Flow of Nitrogen

Materials Science Forum ◽

10.4028/www.scientific.net/msf.503-504.645 ◽

2006 ◽

Vol 503-504 ◽

pp. 645-650 ◽

Cited By ~ 5

Author(s):

A.I. Yurkova ◽

A.V. Byakova ◽

A.V. Belots'ky ◽

Yu.V. Milman ◽

Sergey N. Dub

Keyword(s):

Grain Size ◽

Young’S Modulus ◽

Mechanical Behaviour ◽

Young's Modulus ◽

Grain Structure ◽

Triple Junctions ◽

Fine Grained ◽

Friction Treatment ◽

Iron Modification ◽

Nanocrystalline Iron

Specific features of mechanical behaviour of ultra fine grained iron subjected to friction treatment with nitriding (FN) were clarified by comparison with that induced by friction treatment (FT) with air. Mechanical parameters such as Young’s modulus, nanohardness, and plasticity characteristic δA were found to be of high sensitive both to the scale of grain structure and to iron modification by nitrogen. Young’s modulus tends to decrease and Hall-Petch low fails to describe correlation between grain structure and hardness for submicro-grained and nanocrystalline iron. Hall-Petch coefficient, ky, decreases as grain size decreases within submicro-grained and, then, nano grained sections and it takes even negative value in nano grained section modified by nitrogen. Parameter δA is found to be dependent on combination of hardness and Young’s modulus, resulting in its variation with decreasing the grain size. The presence of secondary nanocrystalline Fe4N phase fundamentally changes mechanical behaviour of nanocrystalline iron, leading to strengthening the grain boundaries and triple junctions.

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