【Progress in the Study of Microwave Pyrolysis Technology and Its Influencing Factors】 Full article: https://lnkd.in/gFWnHeWU (Authored by Hui Fang, et al., from Anhui University of Technology (China), etc.) #Microwave_pyrolysis is an important chemical conversion technology with a wide range of applications, and it can be used in metallurgy for the extraction of metals, in chemistry for the preparation of complex compounds, and in sustainable energy for the production of fuels. This paper summarizses the influencing factors of microwave pyrolysis, including microwave power, pyrolysis temperature and #microwave_absorber, etc., and reviews the development status of #catalysts (molecular sieve catalyst, carbonaceous material catalyst, metal oxide/salt catalyst) in microwave pyrolysis technology, describing the influence of catalysts on the yield and quality of pyrolysis products. #Renewable_Energy
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Editorial Assistant-Scientific Research Publishing. Paper Submission contact: wendywang_scirp@163.com
【Progress in the Study of Microwave Pyrolysis Technology and Its Influencing Factors】 Full article: https://lnkd.in/g84iXavw (Authored by Hui Fang, et al., from Anhui University of Technology (China), etc.) #Microwave_pyrolysis is an important chemical conversion technology with a wide range of applications, and it can be used in metallurgy for the extraction of metals, in chemistry for the preparation of complex compounds, and in sustainable energy for the production of fuels. This paper summarizses the influencing factors of microwave pyrolysis, including microwave power, pyrolysis temperature and #microwave_absorber, etc., and reviews the development status of #catalysts (molecular sieve catalyst, carbonaceous material catalyst, metal oxide/salt catalyst) in microwave pyrolysis technology, describing the influence of catalysts on the yield and quality of pyrolysis products. #Renewable_Energy
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Check out our latest publication in Chemistry of Materials! This paper discusses U+5 chalcogenide materials properties. https://lnkd.in/etQqE32g
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📰 Research and Development of New High-Entropy Alloys for Hydrogen Storage ✍ Dagmara Varcholova, Lenka Oroszová, Katarína Kušnírová and Karel Saksl Hydrogen is a key element in the changing #energy sector and presents an accessible alternative to conventional #fossil fuel sources. In this work, a system of ten high-#entropy #alloys was prepared based on the Hume-Rothery rules. One of the biggest advantages of these alloys is their storage capacity, which reaches the highest value among all known alloys intended for #hydrogen storage. Alloys based on Al-Ti-Nb-Zr elements with different atomic fractions show interesting accumulation capabilities with fast absorption kinetics and low specific gravity. Each alloy in this study underwent high-pressure gravimetric absorption and desorption tests. The main goals of this work were to prepare alloys with the lowest-possible specific gravity and the highest-possible storage capacity. One alloy from our system shows storage capacity values similar to commercial alloys, without any rare-earth elements. Read the paper at https://lnkd.in/gmb5hrq8. #mdpiproceedings #metallurgy
Research and Development of New High-Entropy Alloys for Hydrogen Storage
mdpi.com
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New paper out on microstructure of electrochemically plated lithium and sodium metal - Nature Materials (2024) https://lnkd.in/en2nQt53 Hard and excellent work by the "Tillies" 😁 now finally published. Till Fuchs-Kühn and Till Ortmann developed a workflow for imaging of lithium and sodium metal by EBSD, together with other team members at JLU. Key ingredients are a strictly cryogenic and complete inert gas chain during processing - even cross sections can now be imaged. Thus, "anode-free" grown lithium and sodium can be imaged, and even operando experiments are at hand. Have a look - we were surprised how big the Li and Na grains are. Thanks also to a great collaboration with the groups of Jeff Sakamoto and Linda Nazar at UCSB and U Waterloo.
Imaging the microstructure of lithium and sodium metal in anode-free solid-state batteries using electron backscatter diffraction - Nature Materials
nature.com
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I am thrilled to share our latest research paper titled "Hydrogen Reduction of Iron Ore Pellets: A Surface Study using Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS)" by Aidin Heidari and a team. This study delves into surface transformations during the hydrogen reduction of iron ore pellets, leveraging the advanced capabilities of APXPS to observe these changes under realistic conditions. Key findings from our research include: - Enhanced reduction rates of iron ore pellets with increased gas flow rate and pressure. - DRI pellets achieved about 90% metallization with hydrogen, surpassing BF pellets which only reached around 9% under similar conditions. - BF pellets attained approximately 20% metallization with a hydrogen-carbon monoxide mixture, whereas DRI pellets exhibited no reduction with this gas combination. - Reoxidation in BF pellets using a CO–H₂ mixture due to an increase in the partial pressure of H₂O–CO₂. These discoveries offer valuable insights into the reduction processes of iron ore pellets in hydrogen-rich atmospheres, contributing significantly to the advancement of more efficient and sustainable metallurgical processes. Explore the full study for further details: https://lnkd.in/dNS64WEv Aidin Heidari Samuli Urpelainen Timo Fabritius Marko H. Mohammed ALAOUI MANSOURI Esko Kokkonen
Hydrogen reduction of iron ore pellets: A surface study using ambient pressure X-ray photoelectron spectroscopy
sciencedirect.com
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Our article, "Disentangling Competitive and Synergistic Chemical Reactivities During the Seeded Growth of High-Entropy Alloys on High-Entropy Metal Sulfide Nanoparticles", was recently accepted into JACS and is now available online! Thanks to the invaluable guidance of my mentor Joe Veglak and PI Dr. Raymond Schaak, I have learned so much from being on this project. https://lnkd.in/e92zmB_Z Over the last fifty years, inorganic nanocrystals have emerged as pivotal materials in catalysis, energy and electronics technology. Low-temperature, colloidal (solution-based) methods enable the facile synthesis of novel nanocrystal materials. However, colloidal syntheses rely on elegant manipulation of chemical reactivities to achieve the desired products. Here, we study the nucleation of high entropy alloy nanocrystals, which are "solid solutions" of five or more metal elements, upon preexisting metal sulfide nanocrystal seeds. These materials have superior properties when compared to their individual end members, but are complex synthetic targets. To understand the reactivity landscape of such systems, we have synthesized a library of 36 nanocrystal heterostructures, from which we identified the fundamental chemical principles and reaction conditions guiding seeded growth. Ultimately, our results contributed key insights about controlling colloidal reaction pathways and nanocrystal composition and morphology.
Disentangling Competitive and Synergistic Chemical Reactivities During the Seeded Growth of High-Entropy Alloys on High-Entropy Metal Sulfide Nanoparticles
pubs.acs.org
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Pesquisadora nível Doutorado CAPES| Especialista em Eletrorrecuperação de metais| Química | Doutorado em Engenharia Metalúrgica COPPE-UFRJ
In April 2024, I published the article "Effect of Additives and Cl− Ions on the Physical and Chemical Properties of Cobalt Deposits Obtained by Electrowinning" in the journal Metallurgical and Materials Transactions B. This study is part of my ongoing PhD project. **Abstract:** The optimization of the cobalt electrowinning process is crucial for improving the quality of metallic deposits, as cobalt plays a fundamental role in the manufacturing of high-tech materials. The effects of additives such as sodium lauryl sulfate (SLS), boric acid, and Cl− ions on the physical and chemical properties of cobalt deposits obtained by electrowinning are scarcely covered in the literature. This study investigated the effect of additive concentrations on current efficiency (CE), specific energy consumption (SEC), and the physical and chemical properties of cobalt deposits (crystalline phases, grain and crystallite sizes, morphology, purity, and microhardness) produced through electrodeposition tests in the presence of a cobalt sulfate solution at 200 A/m², 60 °C, and pH 4. The results indicated that the presence of 0.05 g/L SLS in the solution led to the best values for CE (95.5%) and SEC (1.80 kWh/kg), as well as the production of uniform deposits. Cracks were identified in the cross-sectional area of the metallic deposits under all evaluated conditions, with the detection of oxygen in these areas, except for Cl− ions. Higher concentrations of SLS and boric acid resulted in the production of deposits with low microhardness and less fragility, attributed to the increased crystallite and grain sizes. The predominant crystalline phase for all deposits was hexagonal close-packed (HCP), but the presence of SLS and Cl− ions led to significant percentages of the face-centered cubic (FCC) phase. Furthermore, increasing Cl− ion concentration led to an increase in residual deformations in the crystalline structure of cobalt deposits, while increasing SLS and boric acid concentrations led to a decrease in these residual deformations. https://lnkd.in/dFJ9TEq8
Effect of Additives and Cl− Ions on the Physical and Chemical Properties of Cobalt Deposits Obtained by Electrowinning - Metallurgical and Materials Transactions B
link.springer.com
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Metals or alloys with low melting points are used as dopants for supported metal catalysts or as electronic and structural promoters. We found that they also improve the stability of zeolite catalysts. Read about that in our paper in Nature Communications. https://lnkd.in/evdCRPhR
Liquid metals for boosting stability of zeolite catalysts in the conversion of methanol to hydrocarbons - Nature Communications
nature.com
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| Materials sciences professional with 15 yrs expertise in Structure-Property Correlation studies | Project management | Research & Innovation management | Analytical/Research Facility Operations | Electron-microscopy |
The power of #electronmicroscopy to battery materials. Love this paper where intricate work of dealing with Li and Na is provided.
New paper out on microstructure of electrochemically plated lithium and sodium metal - Nature Materials (2024) https://lnkd.in/en2nQt53 Hard and excellent work by the "Tillies" 😁 now finally published. Till Fuchs-Kühn and Till Ortmann developed a workflow for imaging of lithium and sodium metal by EBSD, together with other team members at JLU. Key ingredients are a strictly cryogenic and complete inert gas chain during processing - even cross sections can now be imaged. Thus, "anode-free" grown lithium and sodium can be imaged, and even operando experiments are at hand. Have a look - we were surprised how big the Li and Na grains are. Thanks also to a great collaboration with the groups of Jeff Sakamoto and Linda Nazar at UCSB and U Waterloo.
Imaging the microstructure of lithium and sodium metal in anode-free solid-state batteries using electron backscatter diffraction - Nature Materials
nature.com
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Noble metals, such as gold, are the key to reducing the environmental impact of chemical manufacturing. In our latest work, we demonstrate for the first time that oxidation reactions can occur efficiently on a bulk gold surface. Furthermore, using tip-enhanced Raman spectroscopy (TERS), we prove that the activation of molecular oxygen on the bulk gold surface is mediated by water. A great example of how TERS can contribute to the mechanistic understanding of catalytic chemistry. Check out the full open-access paper here: https://lnkd.in/e7iZix_E - with Zhen-Feng Cai #raman #ramanspectroscopy #catalysis #oxidationchemistry #ters #nanoscience #nanoimaging #surfacechemistry
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