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اسلاید 1: Thermodynamic of Adsorption of Rhenium with Anion Exchange Resin
اسلاید 2: Rhenium - Chemical element with the symbol of Re and atomic number 75- It is a silvery-white, heavy and one of the rarest elements in the. Earths crust -Rhenium resembles manganese chemically and is obtained as a by-product of molybdenum and copper refinement. Rhenium shows in its compounds a wide variety of oxidation states ranging from −1 to +7.
اسلاید 3: Applications of Rhenium -Rhenium is added to high-temperature superalloys that are used to make jet engine parts, making 70% of the worldwide. - The alloys normally contain 3% or 6% of rhenium production.Another major application is in platinum-rhenium catalysts, which are primarily used in making lead-free, high-octane .gasoline
اسلاید 4: Applications of Rhenium(catalyst)Rhenium in the form of rhenium-platinum alloy is used as catalyst for catalytic reforming, which is a chemical process to convert petroleum refinery naphthas with low octane ratings into high-octane liquid products. Worldwide, 30% of catalysts used for this process contain rhenium. The olefin metathesis is the other reaction for which rhenium is used as catalyst. Normally Re2O7 on alumina is used for this process. Rhenium catalysts are very resistant chemical poisoning from nitrogen, sulfur and phosphorus, .
اسلاید 5:
اسلاید 6: Perrhenate-The perrhenate ion is ReO4− and a perrhenate is a compound containing this ion. Salts of perrhenic acid are known as perrhenates. The perrhenate anion is tetrahedral, as shown by spectroscopy.-The perrhenate anion is also used as a weakly coordinating anion. It is a weaker base than Cl− or Br− but stronger than ClO4− or BF4−.-Structurally the behavior of ReO4− resembles that of perchlorate, ClO4−: perrhenate and perchlorate salts are often isomorphous.َ
اسلاید 7: Potassium perrhenate -KReO4 is common and is the basis of the recovery of rhenium compounds from natural ores and laboratory residues
اسلاید 8: Ammonium perrhenateThe crystal structure of ammonium perrhenate with orientationally ordered ammonium ions (blue) and ReO4 (grey) tetrahedra
اسلاید 9: Ammonium perrhenate-Ammonium perrhenate (APR) is the ammonium salt of perrhenic acid, NH4ReO4. This is the most common form in which rhenium is traded. Rhenium content of APR is typically 69.0 - 69.4%Reactions-Pure rhenium powder can be produced from APR by reducing it with hydrogen2 NH4ReO4 + 7 H2 → 2 Re + 8 H2O + 2 NH3
اسلاید 10: Anion resin-AmberlitePurolite- -Vario
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