Cu Y Zeolite
Open-knowledge reference entry
Cu-Y zeolites (CuY, CuFAU, copper faujasite) are copper-containing high-silica derivatives of the faujasite mineral group which in turn is a member of the zeolite family. Cu-Y zeolites are synthesized through aqueous or gaseous ionic exchange unlike the naturally occurring faujasites: faujasite-Ca, faujasite-Mg, and faujasite-Na. The exchanged copper atom can vary in oxidation states, but the most studied Cu-Y zeolite variants include Cu(I) or Cu(II) cations. Due to their high catalytic potential, they are utilized as desulfurization agents and in the production of nitrogen gas from nitrogen monoxide.
History
Copper based type Y zeolites were first described as a means of hydrocracking in a patent filed in 1963, and were soon implemented in industrial hydrocracking processes. They eventually began to find use in other industries as the usage of zeolites increased as a whole, such as removal of carbon monoxide from gas. In 1972, a patent was filed describing the production of Cu-Y zeolites from sodium-based zeolites, helping to further spread its use in the industry. The first documented use of Cu-Y zeolites for desulfurization was in 1977, in which a variety of zeolites including the Cu-Y variant were used to remove hydrogen sulfide from gases. From then on, various methods were developed utilizing Cu-Y zeolites in desulfurization of hydrocarbons, reducing their environmental impact when used as fuel.
Properties
Many experiments have been done to understand the properties of Cu-Y zeolites.
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