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- W1573812525 abstract "CoAPO-11 and VAPO-5 were synthesized in the presence of diisopropylamine. XRD indicates high crystalline materials with the isotopic structure of respectively ALPO-11 and ALPO-5. CoAPO-11 UV-spectra and the existence of acidic OH revealed by infrared, indicate isomorphous substitution of divalent cobalt for aluminium. Removal of the template by O2-treatment at 773 K produced a diamagnetic oxo-type cobalt Co=O. This species activates molecular oxygen only after H2-treatment at high temperature. The esr spectra of the oxygen adduct formed upon O2 adsorption on H2-reduced CoAPO-11 correspond to the paramagnetic species Co(2+)-O-Oo. The amount of this peroxo cobalt adduct increases with the severity of the H2-treatment. One concludes that Co=O is converted into an active Co(2+) species by H2-treatment. treatment. Co(2+)-O-Oo is very reactive toward H2, hydrocarbons, and is regenerated by cyclic O2 adsorption. At high temperature about 573–773 K Co(2+)-O-Oo is converted into Co =O oxo species non active to activate molecular oxygen. VAPO-5 was studied by esr. The esr spectra revealed the presence of V4+ both in the sample as synthesized and in the 773 K O2-treated sample to remove the template. Tetravalent V is rather stable in O2 at high temperature which indicates that V4+ ion substitutional framework position is resistant towards oxidation. Like CoAPO-11, oxygen adducts V-O-Oo are formed, as revealed by esr, only after H2-treatment at high temperature. The esr results are interpreted similarly to those on CoAPO-11." @default.
- W1573812525 created "2016-06-24" @default.
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- W1573812525 date "1997-01-01" @default.
- W1573812525 modified "2023-09-25" @default.
- W1573812525 title "Chemistry of CoAPO-11 and VAPO-5:ESR studies of molecular oxygen adducts" @default.
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- W1573812525 doi "https://doi.org/10.1016/s0167-2991(97)80631-3" @default.
- W1573812525 hasPublicationYear "1997" @default.
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