Catalytic reduction of NO with CO over CuxCo3?xO4 spinels

The interaction between NO and CO over Cu_xCo_3–xO₄ spinels (0x1) has been studied. It has been found that the two reactions of NO reduction, to N₂O and N₂, respectively, are accelerated by the increase of Cu content (x). With the second reaction acceleration occurs only at x>0.5. This is attributed to the presence of different centers on which N₂O and N₂ are formed.

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NO CO Cu_xCo_3–xO₄ (0x1). , NO N₂O N₂ Cu (x). x>0,5. , N₂O N₂.

     

Catalytic properties of palladium oxide systems in the hydrogenation of crotonaldehyde

Catalytic properties of Pd black-oxide systems have been studied in hydrogenation of crotonaldehyde. It has been revealed that the additions of basic and amphoteric oxides (MgO, Fe₂O₃ and ZnO) increase the hydrogenation rate of the ethylenic bond in crotonaldehyde.

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Pd-- . , (MgO, Fe₂O₃, ZnO) .

     

Mechanism of homogeneous catalysis of isotope exchange during interaction of dihydrogen with alkaline solutions

The mechanism of hydrogen isotope exchange in aqueous alkaline solutions (AAS) of D₂ has been studied using Interacting Bonds Method (IBM) data obtained for hydrogen interaction with the molecular ion H₃O ₂ ^– . Models for the activated and metastable intermediate complexes are described.

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- D₂ (). () H₃O ₂ ^– . .

     

ESR spectra of O2? on SnO2. effect of adsorbed CO on the conditions of stabilization of O2?

The physical adsorption of CO molecules on SnO₂ is shown to be accompanied by a reversible change in the ESR parameters of CO ₂ ^– anion radicals. The effect of CO is different for SnO₂ samples with different life histories.

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, CO SnO₂ - O ₂ ^– , CO SnO₂ .

     

Interaction of CO and O2 on the oxidized surface of polycrystalline palladium

The interaction of CO and O₂ on the oxidized surface of polycrystalline palladium under steady state reaction conditions has been studied. The adsorption of carbon monoxide leads to the appearance of its and states. The state on the surface shifts the temperature dependence of the CO oxidation rate under s.s. conditions by about 200 K.

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CO O₂ . , CO. CO 200° CO .

     

On the role of symmetric hydrogen bonds of increased strength in isotope exchange of dihydrogen with water-alkaline solutions

The chemical effect of a hydrogen bond of increased strength responsible for the existence of H₃O ₂ ^– and determining mainly the E_a of the catalytic isotope exchange (IE) of hydrogen with water-alkaline solutions (WAS) is discussed. Assuming that the H₃O ₂ ^– associates are also effective in the case of water-alkaline melts (WAM), experimental kinetic evidence in favor of the suggested treatment of the IE mechanism is considered.

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, H₃O ₂ ^– E_a () (). H₃O ₂ ^– - () .

     

On the structure and activity of a Pt/C catalyst subjected to repeated deactivation and regeneration cycles

Electron microscopic studies reveal that repeated air/hydrogen regeneration cycles cause irreversible structural changes of a Pt/C catalyst involving sintering and migration of the platinum over the support. This is reflected by a serious decrease of the catalytic activity. With hydrogen treatment only, these effects are less significant.

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, / Pt/C, . . .

     

ESR studies of the state of Ti3+ and Ti2+ in Ti?Mg catalysts for olefin polymerization

ESR studies have revealed that in Ti–Mg catalysts after interaction with organoaluminium compounds, the Ti³⁺ ions formed are present mainly as TiCl₃ associates. Isolated Ti³⁺ ions of various types are also detected. Part of titanium ions is in the divalent state and provides an ESR signal after oxidation by water to the trivalent state in the form of Ti³⁺ ordered by cooperative Jahn-Teller interaction.

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, - , Ti³⁺ TiCl₃. Ti³⁺ . Ti³⁺ - -.

     

A new method for preparation of Mo/Al2O3 catalysts for olefin metathesis

A new method of preparation of highly active catalysts for metathesis of -olefins through the anchoring of [Mo₂O₄(C₂O₄)₂(H₂O)₂]^2– anion to the surface of -Al₂O₃ with further thermal activation in H₂ and CO is proposed.

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- [Mo₂O₄(C₂O₄)₂(H₂O₂]^2– -Al₂O₃ H₂ CO.