Rhenium (Re)
Rhenium is a silvery-white metal, with one of the highest melting points of all metals. With an average concentration of 1 ppb, rhenium is one of the rarest elements in …
Effect of carbon on the reducibility of rhenium in Pt …
U.S. Department of Energy Office of Scientific and Technical Information. Search terms: Advanced search options. ...
What metals aren't dissolved in/attacked by aqua regia?
Rhenium $ce{Re}$ reacts slowly at room temperature $ce{->HReO4}$. This will further react with $ce{HCl -> ReCl4 + Cl2}$.$^{[2]}$ ... {Pt}$ and $ce{Au}$ react fine. This is direct evidence that for other metals a protective layer should form. The layer varies from metal to metal, but usually is either an oxide (or oxide hydrate), or a ...
Thermodynamic description of the aluminum–rhenium system
Phase relationships in the Al–Re binary system have been thermodynamically reassessed by using the CALPHAD technique to take into account the most recent experimental data in the Al-rich part. A new version of the Al–Re phase diagram considering the congruent melting of the Al11Re4 as well as the modified temperatures and nature of …
Effect of Re on product yields and deactivation
Increase in aromatic yields and decrease in cracking yields was observed up to 0.6 wt.% rhenium loading (Re/Pt weight ratio = 2.0). Further increase of Re caused …
Rhenium Market Growth Rate 2020 | (Molymet,Freeport …
3.3 Global Rhenium Production Capacity, Revenue, Price and Gross Margin (2015-2020) 3.4 North America Rhenium Production 3.4.1 North America Rhenium Production Growth Rate (2015-2020)
Rhenium | XPS Periodic Table | Thermo Fisher Scientific
Rhenium, a silver, lustrous metal, has one of the highest melting points of all elements, with only tungsten and platinum being higher. Trace amounts of the element rhenium were discovered spectroscopically in platinum ores in the minerals columbite, gadolinite, molybdenite,and in platinum ores by the German chemists I. Tacke-Noddack, W ...
Platinum-rhenium interaction: A temperature-programmed …
Abstract. A study of Pt, Re, and Pt Re on γ-alumina catalysts was made by temperature-programmed reduction (TPR). As observed by others, an interaction occurs with Pt and Re when Pt Re catalysts are preoxidized at 300 °C or below; Re reduces at lower temperatures compared to Re Al 2 O 3. At 500 °C preoxidation, TPR profiles of Pt …
relation between reaction time and 1-(1-a) 1/3
Download scientific diagram | relation between reaction time and 1-(1-a) 1/3 from publication: Kinetics research on rhenium of the waste platinum-rhenium catalyst under pressure oxygen leaching ...
Platinum-rhenium interaction: A temperature …
Abstract. A study of Pt, Re, and Pt Re on γ-alumina catalysts was made by temperature-programmed reduction (TPR). As observed by others, an interaction occurs …
Platinum-rhenium interaction: A temperature-programmed …
A study of Pt, Re, and Pt Re on γ-alumina catalysts was made by temperature-programmed reduction (TPR). As observed by others, an interaction occurs with Pt and Re when Pt Re catalysts are preoxidized at 300 °C or below; Re reduces at lower temperatures compared to Re Al 2 O 3.At 500 °C preoxidation, TPR profiles of Pt …
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Normalised XANES for CoRe1.6 compared to reference
Experimental material was the waste platinum-rhenium catalyst; the kinetics of rhenium in PT rhenium catalyst failed by pressure oxygen leaching was studied. The effects of leaching pressure ...
JHQ OHDFKLQJ Rhenium from Reline Deep Eutectic …
Abstract: Experimental material was the waste platinum-rhenium catalyst; the kinetics of rhenium in PT rhenium catalyst failed by pressure oxygen leaching was studied. The effects of leaching pressure, temperature, sulfuric acid acidity, stirring speed and particle size on the kinetics of rhenium leaching were investigated in this paper.
Номин Холдинг — Википедиа нэвтэрхий толь
5,800+. Цахим хуудас. https:// "Номин Холдинг" ХХК нь 1992 онд "Номин-5" ХЭАА нэртэйгээр байгуулагдаж, 1996 онд "Номин Трейд" ХХК, 2002 онд "Номин Холдинг" ХХК болон өргөжин Борлуулалт ...
Discovery, properties and applications of rhenium and its …
Rhenium's hexagonal close-packed crystal structure (space group: P 6 3 / mmc) is stable up to the melting point. Therefore, a change from ductile to brittle is excluded. The corrosion resistance of rhenium is sufficient. Its oxidation at moderately high temperatures leads to the formation of ReO 2 and Re 2 O 7.
Effect of Re on product yields and deactivation
Rhenium in Pt–Re/Al 2 O 3 catalyst is known to exist in two types of active sites, namely, (1) Pt–Re ensembles and (2) support (Al 2 O 3) interacted rhenium [13]. …
Reducilbility of rhenium in Pt-Re/Al {sub 2}O {sub 3} …
@article{osti_111017, title = {Reducilbility of rhenium in Pt-Re/Al{sub 2}O{sub 3} reforming catalysts a temperature programmed reduction-X-ray absorption near-edge structure study}, author = {Michel, C G and Bambrick, W E and Ebel, R H}, abstractNote = {Temperature programmed reduction (TPR) experiments were performed on Pt …
The fraction of bimetallic phase determined at the Re
Experimental material was the waste platinum-rhenium catalyst; the kinetics of rhenium in PT rhenium catalyst failed by pressure oxygen leaching was studied. The effects of leaching pressure ...
Fan Xingxiang's research works | Honghe University, …
Experimental material was the waste platinum-rhenium catalyst; the kinetics of rhenium in PT rhenium catalyst failed by pressure oxygen leaching was studied. The effects of leaching pressure ...
Periodic Table
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
Rhenium
Rhenium is one of the rarest elements and its rarity, of no more than 0.4 parts per billion in the Earth's crust, makes it the 77th most abundant element. Rhenium has the 3rd …
Platinum-rhenium-alumina catalysts : III. Catalytic properties
Abstract. The activity of Pt Re catalysts on α- or γ-alumina has been determined for various reactions. In no case is the activity of bimetallic catalysts the sum of the activity of platinum and rhenium of which the catalyst is composed. Curves of activity as a function of the composition of the catalyst exhibit one or two maxima in benzene ...
Surface area measurement of platinum/rhenium/alumina
Surface area measurement has been used to examine the effects of catalyst pretreatment on reduced Pt/Re/Al 2 O 3 catalysts. The results indicate significant alloy formation in reduced Pt/Re/ Al 2 O 3 for all drying temperatures of 500 °C or less. While the surface amount of alloyed Pt-Re is insensitive to the drying temperature, the surface …
Effect of heat treatment on thermoelectric properties of …
In the 1980s, Grant discovered that platinum/platinum rhodium (Pt/Pt-Rh) TFTCs could be used at 1000 °C, but the oxidation of rhodium would cause temperature drift of the thermocouples. 3 Nickel chromium/nickel silicon ... 95% tungsten - 5% rhenium (W-5Re) and 74% tungsten - 26% rhenium (W-26Re) were sputtered as the positive film …
Discovery, properties and applications of rhenium …
Cryptocurrencies as an Investment Vehicle: The Asymmetric …
On the other hand, there is unidirectional causality from Bitcoin to rhenium. Accordingly, increases in Bitcoin price are cause of decreases in rhenium price. When the asymmetric causality test results evaluated together, it may be said that to construct a portfolio from Bitcoin, osmium, rhenium and ruthenium will provide benefit to the investors.
Rhenium
Rhenium is a silvery-white metal. It has the third highest melting points of all elements. It is also the third densest element. Isotopes. Rhenium has one stable isotope which is rhenium-185. Rhenium that is found in nature is made up of 37.4% rhenium-185 and 62.6% rhenium-187. Rhenium has 33 known radioisotopes. They range from rhenium …
Role of rhenium in Pt-Re-Al
The inclusion of Re in Pt-Re-Al 2 O 3 reforming catalysts to improve the lifetime is known, but how rhenium functions and how it is disposed in the catalyst remain unclear. These fundamental questions have been attempted in this study by the use of proton-induced X-ray emission and Rutherford backscattering spectrometry (together with electron microscopy …
Supported Pt and Re-Pt on alumina prepared by sol-gel …
@article{osti_501861, title = {Supported Pt and Re-Pt on alumina prepared by sol-gel synthesis with in situ water formation: Role of rhenium}, author = {Rezgui, S and Jentoft, R and Gates, B C}, abstractNote = {Sol-gel chemistry offers flexible methods for the preparation of porous metal oxides such as the transition aluminas used as catalyst …