Search results
Results From The WOW.Com Content Network
Rhenium can form in many oxidation states, and compounds are known for every oxidation state from -3 to +7 except -2, although the oxidation states +7, +4, and +3 are the most common. [1] Rhenium is most available commercially as salts of perrhenate, including sodium and ammonium perrhenates. These are white, water-soluble compounds. [2]
These salts are prepared by oxidation of rhenium compounds with nitric acid followed by neutralization of the resulting perrhenic acid. [2] [3] [4] Addition of tetrabutylammonium chloride to aqueous solutions of sodium perrhenate gives tetrabutylammonium perrhenate, which is soluble in organic solvents. [5]
The olefin metathesis is the other reaction for which rhenium is used as catalyst. Normally Re 2 O 7 on alumina is used for this process. [73] Rhenium catalysts are very resistant to chemical poisoning from nitrogen, sulfur and phosphorus, and so are used in certain kinds of hydrogenation reactions. [23] [74] [75]
The AOL Help site is your starting point for getting support from AOL. Support may come via phone, chat, social media or help articles, depending on the question or issue you have.
Rhenium(IV) oxide or rhenium dioxide is the inorganic compound with the formula ReO 2. This gray to black crystalline solid is a laboratory reagent that can be used as a catalyst . It adopts the rutile structure.
December 4, 2024 at 2:48 PM Three U.S. Army soldiers stationed in Texas have been charged in an alleged human smuggling operation involving noncitizens from Mexico and Guatemala, federal officials ...
A strong 7.0 magnitude earthquake has struck off the coast of northern California, according to the US Geological Survey. A tsunami warning was initially issued along the coasts of both northern ...
A Sudanese woman identified only as Hania, 18, told Human Rights Watch she was pregnant in February 2024 when RSF fighters burst into her home in Habila, South Kordofan state, and abducted her ...