The Oxidation State of Rhenium and Its Role in …
The influence of rhenium in prolonging the lifetime of platinum-rhenium catalysts has variously been ascribed to (i) the formation of an alloy which is less active than pure platinum for dehydrogenation (6–9); (ii) the presence of Re 4+ which is active for the hydrogenation of carbon deposits (10, 11); or (iii) the stabilisation of platinum crystallites against sintering (12, 14).
Rhenium
It is also used with the Platinum to serve as make a catalyst for reforming catalytic. Experience. Depending on the price of Rhenium at any given point, the effluent discharged by reforming plants, containing nearly. 70 ppm of rhenium; 13 ppm Platinum, is interesting to treat economically. ELSA has developed, thanks to its technology, a recovery of Rhenium and Platinum to 92% which is ...
Hydroconversion of n-heptane on catalysts …
INTRODUCTION Rhenium is considered one of the most effective promotors for platinum in naphtha reforming catalysts [1] supported on alumina. The Pte/alumina catalysts have also proved to be successful in the deeper saturative hydrogen- ation of aromatic rings at low temperatures [7,81. However, the Pte com- bination has recently been used in catalysts containing hydrogen mordenite [9] and …
The State of the Metal Phase in Supported …
The platinum-ruthenium system, studied with a thermal conductivity cell instead of a thermobalance as in the platinum-rhenium system, has corroborated the usefulness of this method. When the hydrogen titrations are performed at a linearly increasing temperature, the oxygen chemisorbed by the platinum is titrated at room temperature, the oxygen chemisorbed by the alumina supported pure ruthenium …
rhenium platinum ntaining - MC Machinery
2017-09-28 One example of 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.
Method of concentrate receiving, containing …
A method of refining aluminium oxide-platinum catalysts, mainly containing rhenium, by first roasting the waste catalyst in an atmosphere of air in order to remove from its surface organic deposits and burning sulfur and soot, the dissolution of the calcine in the hydrofluoric acid deposition from the resulting solution of rhenium and platinum in the form of insoluble sulfides using ...
Rhenium – a valuable and rare element
We provice analytical services and competent advice on logistics and waste issues. Individual solutions rhenium metal management such as financing and leasing is part of our portfolio. Besides Rhenium, Heraeus offers ruthenium and platinum-containing compounds used in turbine blade production. Contact our rhenium experts for further information. We look forward to advising you.
platinum-rhenium - Deutsch-Übersetzung – Linguee Wörterbuch
Viele übersetzte Beispielsätze mit "platinum-rhenium" – Deutsch-Englisch Wörterbuch und Suchmaschine für Millionen von Deutsch-Übersetzungen.
METHOD FOR PLATINUM RECOVERY FROM …
28.09.2017 · One example of 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.
Learn About Rhodium, a Rare Platinum Group Metal
Rhodium and platinum-rhodium catalysts are used in the production of oxo-alcohol manufacturing as well as to produce nitric oxide, a raw material for fertilizers, explosives, and nitric acid. Glass production accounts for a further 3 percent to 6 percent of rhodium consumption each year.
Features of an Electron State and Catalytic …
Features of an Electron State and Catalytic Properties of the L-type Platinum-Containing Zeolite. ... Therefore it is to be noted that the modification of the platinum-containing KL-zeolite with rhenium or tungsten intensifies the electron-acceptor properties of the catalysts. A similar phenomenon may promote a change in the adsorption of hydrocarbons on metal-zeolite contacts resulting in a ...
rhodium | Definition, Properties, Uses, & Facts | …
Rhodium chemistry centres chiefly on the +1 and +3 oxidation states; a few compounds of the other positive oxidation states through +6 are recognized. Rhodium forms the dirhodium tetraacetate, Rh 2 (O 2 CCH 3) 4 and various derivatives containing two additional ligands—e.g., water, pyridine, or triphenylphosphine—in oxidation state +2. Complexes in oxidation state +1 chiefly contain carbon ...
Catalytic reforming with rhenium-platinum …
26.10.1982 · The preferred weight ratio of rhenium to platinum is in the range of from about 21/4 to about 31/2. Except for the increased rhenium-platinum weight ratio, the new catalytic composite may be made in the same manner as has been known heretofore for making catalysts having a lower rhenium-platinum ratio. The amount of platinum may be in the range of from about 0.1 to about 2 percent, …