Photoassisted catalytic oxidation of isopropyl alcohol by uranyl-exchanged zeolites

Oxidation of 2-propanol ligands during collision-induced dissociation of a gas-phase uranyl complex

“…As noted earlier, Suib et al [37,38] reported the photoassisted catalytic oxidation of 2-propanol to acetone by uranyl ion exchanged into the cavities of zeolite materials, and the chemistry observed with the condensed uranyl-2-propanol system was a motivation for the present gas-phase study. In the previous solid-phase experiments, the number and nature (splitting) of peaks in luminescence spectra were cited as evidence that 2-propanol was bound to an equatorial site on the uranyl ion within the zeolite matrix [37].…”

“…In the previous solid-phase experiments, the number and nature (splitting) of peaks in luminescence spectra were cited as evidence that 2-propanol was bound to an equatorial site on the uranyl ion within the zeolite matrix [37]. Other oxygen atoms within the equatorial positions were likely zeolite framework atoms, either bound to silicon or aluminum.…”

“…Our interest in this particular system arose from previous reports of the photocatalytic conversion of 2-propanol to acetone by uranyl ion exchanged into the cavities of zeolite materials [37,38]. One of our long-term goals is to use ESI to generate gas-phase ions of relevance to catalytic metal centers in condensed phases and to investigate their intrinsic chemistry by ion-trap mass spectrometry.…”

An overview of studies on the highly dispersed uranium oxide species occluded within mesoporous MCM-41 and MCM-48 host materials

“…Also, the *UO 2þ 2 species are shown to react with alcohols and several other substrates by hydrogen atom abstraction that ultimately helps in oxidation of these compounds [13][14][15][16][17]. We may mention that while most of these studies pertain to homogeneous mode reactions in solution phase, there are some reports on immobilization of uranyl ions over glasses, clays and zeolites [20][21][22]. For instance, Suib and coworkers have reported on the photo-catalytic activity of such supported materials for oxidation of ethanol, dimethyl ether and propanol [20,21].…”

“…We may mention that while most of these studies pertain to homogeneous mode reactions in solution phase, there are some reports on immobilization of uranyl ions over glasses, clays and zeolites [20][21][22]. For instance, Suib and coworkers have reported on the photo-catalytic activity of such supported materials for oxidation of ethanol, dimethyl ether and propanol [20,21].…”