FTIR investigations on the influence of oxygen spillover on the oxidation rate of adsorbed benzoic acid

Investigations about coke burning and oxygen spillover

“…The best fits were usually obtained with the reaction order 1/2, which is in good agreement with [14] and is often found for radical reactions. A curve of this type may be seen in Fig.…”

Investigations about gas phase oxygen spillover

“…In earlier investigations [1][2][3] we discussed oxygen spillover from platinum on alumina to benzoic acid (adsorbed on alumina) or to carbon in the form of graphite or different carbon blacks. In these cases we could not obtain information about the mechanism by which the activated oxygen particles migrate form the metal to the oxidizable substance.…”

Dynamics of Hydrogen Spillover on Pt/γ-Al2O3Catalyst Surface: A Quantum Chemical Molecular Dynamics Study

“…Khoobiar as well as Ioannides and Verykios showed that the H 2 molecule was adsorbed on Pt/Al 2 O 3 even at room temperature. Baumgarten et al − have published a series of papers wherein they concluded that spillover hydrogen diffuses into the gas phase even at low temperatures (<400 K). Spencer et al commented on the series of papers of Baumgarten et al that the transport of hydrogen atoms into the gas phase is not a general phenomenon at low temperatures such as 333−373 K. An earlier analysis by Leavy and Boudrat indicates that temperature greater than 800 K would be required for the formation of free hydrogen atoms in a typical catalytic system.…”

“…Spillover of hydrogen consists of several elementary steps of reactions such as adsorption, dissociation, diffusion and desoprtion. Since no studies to date have been able to study the spillover step in isolation, all studies interpret experimental data for a combination of sequential steps. − The temperature dependency of catalytic activity will convey some information on the mechanisms. Khoobiar as well as Ioannides and Verykios showed that the H 2 molecule was adsorbed on Pt/Al 2 O 3 even at room temperature.…”