Journal of Petroleum & Environmental Biotechnology

Uptake of excess oxygen by fully indium-exchanged Zeolite Y to form cyclo-ozone rings and peroxides

World Congress on Petrochemistry and Chemical Engineering

November 18-20, 2013 Hilton San Antonio Airport, TX, USA

Karl Seff

Accepted Abstracts: J Pet Environ Biotechnol

Abstract:

Just as barium metal heated in air in the temperature range 300 to 500 oC forms barium peroxide, the In 5 7+ ion (centered tetrahedral) in zeolite Y forms cyclo -ozone rings, one nestled in each of its ?faces,? upon heating in oxygen. Furthermore, each ring bonds to three other oxygen atoms to give all cis -1,2,3-trioxo- cyclo -ozone, which, via these three outermost oxygen atoms, binds covalently to oxide ions of the zeolite framework. Elsewhere in the crystal structure it is seen that some of the normal zeolite framework oxygen atoms have become peroxide ions, bridging between framework silicon and/or aluminum atoms in a mu -peroxo (sideways) manner. Additional indium peroxide structure is seen within the supercage. This material is stable at high temperatures-it is prepared at 350 oC and has survived evacuation at that temperature. Its structure was determined by single- crystal diffraction methods using synchrotron radiation, and is one of the most complex ever determined in this laboratory. Anhydrous fully In-exchanged zeolite Y, prepared by reacting fully Tl + -exchanged zeolite Y with In metal at 350 oC, is not a simple material: it contains In + , In2 + , and In 5 7+ ions. Such novel chemistry occurring within a zeolite can (1) help to understand existing applications of In exchanged zeolites in catalysis and (2) lead to new ones.

Biography :

Karl Seff earned his B.S. in chemistry at U.C. Berkeley in 1959, his Ph.D. from M.I.T. in physical chemistry in 1964, and was on the research staff at U.C.L.A. from 1965-1967. Since 1968 he has been a member of the Chemistry Department at the University of Hawaii; he served as its chair from 2000-2003. He has published more than 260 papers in refereed books and journals. Using laboratory techniques and crystallography, he studies the chemistry that can occur within zeolite cavities.