Block‐Copolymers Enable Direct Reduction and Structuration of Noble Metal‐Based Films

Noble metal coordination xerogels films (mesostructured with block-copolymers) exibit solubility switch during X-ray irradiation. Differently from other sol-gel systems, this is attributed to the film deconstruction during irradiation. These materials...

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Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100153336 ◽

1989 ◽

Vol 47 ◽

pp. 272-273

Author(s):

Sooho Kim ◽

M. J. D’Aniello

Keyword(s):

Electron Microscopy ◽

Particle Size ◽

Noble Metal ◽

Catalyst Deactivation ◽

Analytical Electron Microscopy ◽

Microscopy Study ◽

Metal Particles ◽

Automotive Exhaust ◽

Exhaust Catalysts ◽

Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

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Interlayer confinement synthesis of Ir nanodots/dual carbon as an electrocatalyst for overall water splitting

Journal of Materials Chemistry A ◽

10.1039/d0ta09358k ◽

2020 ◽

Author(s):

Yaru Li ◽

Yu-Quan Zhu ◽

Weili Xin ◽

Song Hong ◽

Xiaoying Zhao ◽

...

Keyword(s):

Water Splitting ◽

Noble Metal ◽

High Efficiency ◽

Overall Water Splitting ◽

Highly Dispersed

Rationally designing low-content and high-efficiency noble metal nanodots offers opportunities to enhance electrocatalytic performances for water splitting. However, the preparation of highly dispersed nanodots electrocatalysts remains a challenge. Herein, we...

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Wet-chemical synthesis of noble metal-based nanostructures with controlled phase

10.32657/10356/144404 ◽

2020 ◽

Author(s):

◽

Qinbai Yun

Keyword(s):

Chemical Synthesis ◽

Noble Metal ◽

Wet Chemical Synthesis ◽

Wet Chemical

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ON THE PROCESSING OF HEMATITE RAW MATERIALS AT THE KRYVOROZHSK MINING AND PROCESSING PLANT OF OXIDIZED ORE ON TECHNOLOGY OF DIRECT RECOVERY ITmk3

Metallurgicheskaya i gornorudnaya promyshlennost ◽

10.33101/s005-59768574 ◽

2018 ◽

pp. 32-37

Author(s):

P.I. Loboda ◽

Younes Razaz ◽

S. Grishchenko

Keyword(s):

Magnetic Properties ◽

Cast Iron ◽

Iron Content ◽

Raw Materials ◽

Direct Reduction ◽

Processing Plant ◽

High Iron Content ◽

High Iron ◽

Direct Restoration ◽

First Time

Purpose. To substantiate the efficiency of processing hematite raw materials at the Krivoy Rog Mining and Processing Plant of Oxidized Ores using the direct reduction technology itmk3®. Metodology. Analysis of the results of the itmk3® direct restoration technology developed by Kobe Steel Ltd., Japan and Hares Engineering GmbX, Austria, with a view to using it to process Krivbass hematite ores into granulated iron (so-called “nuggets”). Findings. The involvement in the production of hematite ores (oxidized quartzite) of Krivbass with high iron content, but with low magnetic properties for their processing into granular cast iron is grounded. Originality. The use of itmk3® direct reduction technology from Kobe Steel Ltd., Japan and Hares Engineering GmbH, Austria for the processing of Krivbass hematite ores into granular cast iron is justified for the first time. Practical value. The efficiency of the use of hematite ores (oxidized quartzite) has been substantiated, which can significantly reduce the costs in the mining cycle for the economical production of metallurgical products.

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