The skewed catalyst containing more rhenium than platinum is thought to have a higher hydrogenolysis activity because of its higher Re' concentration [ 10 ] . After presulfidation, the sulfur was preferentially located on rhenium atoms because of the well-known differences in the electronic affinity of platinum, rhenium and sulfur as has ...

There are some methods for recovery of platinum, rhenium and other nobel metals from catalysts [1-10] .One effective method for recovery of Pt and Re from spent catalysts …

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 …

When an aqueous solution (pH 13.2) containing platinum(IV) (10.9 mM) and rhenium(VII) (11.5 mM) was irradiated with 60 mW cm −2 light for 3 h, 95% of initial platinum content was recovered in the precipitate in its zerovalent state with high …

Rhenium-containing products included ammonium perrhenate (APR), metal powder, and perrhenic acid. The major uses of rhenium were in superalloys used in high-temperature turbine engine components and in petroleum-reforming catalysts, representing an estimated 80% and 15%, respectively, of end uses. Bimetallic platinum-rhenium catalysts were used

The silicate sample solution containing 0.1 μg Zn in 0.5 mol L−1 HBr containing 0.15% ascorbic acid (AA) is passed through a 1 mL column with 0.33 mL TEVA resin.

PDF | A variety of processing technologies exist for recovery from both primary and secondary sources of rhenium. Currently, there …

Future ruthenium drugs. In conclusion, ruthenium compounds have shown highly promising anticancer activity in cells, animals and humans. To date, two compounds are being evaluated in phase II clinical trials. However, a major limitation in ruthenium drug discovery is their unknown mode of action. This leads to three possible strategies for ...

Selective precipitation recovery of rhenium from aqueous solutions containing a coexisting metal (molybdenum, tungsten, or aluminum) by means of …

The presence of platinum-containing precipitate in the reaction system may affect the growth of the rhenium-containing particles. The total mass balance for the two-stage treatment was calculated according to Eqs. (4), (5) for platinum and rhenium, respectively, where n Pt is Pt molar amount and n Re is Re molar amount.

Rhenium. Rhenium (element #75, symbol Re) is a rare, silvery-white metallic element. Rhenium is found as a trace element in platinum ores and in the mineral columbite. It is very dense and has a melting …

Rhenium is a chemical element with the symbol Re and atomic number 75. It is a silvery-white, rare metal that belongs to the group of transition metals.Rhenium has a high melting point and is one of the densest elements known. It is primarily used as an alloying agent in the production of superalloys, which are used in high-temperature …

Element Rhenium (Re), Group 7, Atomic Number 75, d-block, Mass 186.207. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. ... following only platinum, iridium and osmium and it is one of the highest melting point elements exceeded only by tungsten and carbon. ... Until quite recently no mineral containing ...

Abstract. The transformations of 3-carene oxide at rhenium-containing catalysts were studied. The introduction of rhenium into the catalytic system significantly increases the reaction rate and leads to the formation of compounds not previously encountered in the products from the isomerization of 3-carene oxide, i.e., 3-carene, 3(10), 4-caradiene, …

Pointing the Chemical Properties of Rhenium. The electronic configuration is Xe X e 4f14 5d5 6s2. 75 is the atomic number of Rhenium. 3185°C, 5765°F and 3458 K is the Melting point. Atomic mass is 186.23 g.mol -1. The Relative atomic mass is 186.207. The Boiling point is 5590°C, 10094°F, and 5863 K.

2. Platinum-tungsten-rhenium Alloy. Platinum-tungsten-rhenium alloy is a platinum-based ternary alloy containing tungsten and rhenium. A small amount of rhenium can improve the resistivity and tensile strength, and reduce the temperature coefficient of resistance. Platinum-tungsten-rhenium alloy can be used as resistance strain material, …

The platinum and rhenium can then be selectively leached in concentrated (5 mol/L) sulphuric acid solutions containing sodium chloride and a potassium persulfate oxidant (K 2 S 2 O 8) [32]. By using this approach, it was reported that the recovery levels of rhenium and platinum are as high as 95.5% and 97%, respectively [ 32 ].

The rhenium metal pellet price averaged $1,100 per kilogram in 2022, a 15% increase from the annual average price in 2021. Prepared by Désirée E. Polyak [(703) 648–4909, [email protected]] RHENIUM. In 2022, apparent consumption in the United States was 8% less than that in 2021. During 2022, the United States continued to rely on imports for ...

Bertrand introduced mixed metal complexes of platinum and rhenium bound to a modified bis[2-(hydroxyphenyl) ... (CO) 3] + N-heterocyclic carbene complexes containing unsubstituted benzimidazol-2-ylidene and phenanthroline, with MIC values against Gram-positive bacteria between 0.7–2 µg/mL . The mechanism of action of these …

It is also one of the densest elements, following only platinum, iridium and osmium and it is one of the highest melting point elements exceeded only by tungsten and carbon. …

DOI: 10.17516/1998-2836--13-19 Corpus ID: 100051584; Redox Properties of Binuclear Rhenium-Platinum Vinylidene Complexes with Phosphorus Containing Ligands @article{Burmakina2016RedoxPO, title={Redox Properties of Binuclear Rhenium-Platinum Vinylidene Complexes with Phosphorus Containing Ligands}, author={Galina V. …

catalysts consist of platinum (usually 0.3-0.6 wt.%) Supported on γ -alumina, which is activated by HCl. or HF in order to increase its acidic activity (Cl or F content of 0.5-1%). In addition to ...

The rhenium containing systems and corresponding binary compounds are described and considered there in accordance to the groups of elements from 1 to 17. ...

When an aqueous solution (pH 13.2) containing platinum(IV) (10.9 mM) and rhenium(VII) (11.5 mM) was irradiated with 60 mW cm −2 light for 3 h, 95% of initial platinum content was recovered in the precipitate in its zerovalent state with high selectivity (the recovery efficiency was 24 times that of rhenium), while 96% of the initial rhenium ...

The rhenium metal pellet price averaged $980 per kilogram in 2021, a 5% decrease from the annual average price in 2020. In 2021, apparent consumption in the United States decreased by 6% compared with that in 2020. During 2021, the United States continued to rely on imports for much of its supply of rhenium. Canada, Chile, Japan, and …

Trirhenium nonachloride (aka rhenium trichloride), Re 3 Cl 9, is a dark-red hygroscopic solid that is insoluble in ordinary solvents. Re 3 Cl 9 can be prepared by …

A new reforming process employs a new rhenium-platinum catalytic composite having a rhenium to platinum weight ratio in the range of not less than 2 to about 5, whereby longer relative cycle length is obtained when reforming a naphtha having less than about 0.5 ppm by weight of sulfur than if the rhenium-platinum ratio is outside of such range.

Heterobimetallic platinum-rhenium species recently reported are of two types: either incorporating Pt(II) coordination complexes [41,42,43] or redox-active Pt(IV) ... (CO) 3] + N-heterocyclic carbene complexes containing unsubstituted benzimidazol-2-ylidene and phenanthroline, with MIC values against Gram-positive bacteria between …

a material containing both platinum and rhenium is a class of materials called superalloys. Creep-resistant rhenium-containing nickel and cobalt base superalloys were developed to provide high temperature performance in severe environments, such as those encountered in gas turbine engines and in blades for gas turbine generators.

Dehydrogenation with a catalytic composite containing platinum,rhenium and tin AU7318900A (en) * : : Asahi Kasei Kabushiki Kaisha: Catalysts for hydrogenation of carboxylic acid DE10009817A1 (en) * : : Basf Ag: Catalyst used in hydrogenation of carbonyl compounds to alcohols, useful e.g. as solvent …

Rhenium. Rhenium (element #75, symbol Re) is a rare, silvery-white metallic element. Rhenium is found as a trace element in platinum ores and in the mineral columbite. It is very dense and has a melting temperature of 3186 degrees C (5767 degrees F). Rhenium does not form minerals of its own, but does occur as a trace element in the minerals ...

The process comprises the reforming of naphtha fractions to produce high octane gasoline using a catalyst containing platinum and rhenium in association with a porous solid carrier, preferably alumina. The catalyst composition is disclosed as comprising from 0.01 to 3.0 weight percent platinum and 0.01 to 5.0 weight percent rhenium. The ...

71. This paper presents the development of TROPEA alloy, a new platinum-containing nickel-based superalloy designed for single crystal applications. The target was to design an alloy competitive against commercial superalloys which combines high environmental resistance and mechanical strength at elevated temperatures.