Some exact solutions of the Dirac equation in the Kasner space-time

The exact solutions of the covariant generalization of the Dirac equation are obtained in the Kasner space-time for two types of coordinates, cartesian coordinates and cylindrical ones. The tetrads for both cases are constructed on the basis of a global quasicartesian coordinate systems that allows one to get rid of coordinate effects connected with the rotation of the local frame under transition of the triad from one space-time point to another. The possibility of plane and cylindrical spinor waves in the Kasner space-time is proved.     

Binding energy of oxygen in P?Mo heteropoly acid and potassium salt

Calorimetric measurements of oxygen binding energy in P–Mo heteropoly acid of the Keggin structure and its potassium salt have been carried out. The behavior of acid and salt is found to differ essentially in reduction and further reoxidation processes.     

Dependence of the catalytic properties of cobalt molybdate in propylene oxidation on the surface reduction and oxygen bond energy

The dependences of the tate of partial propylene oxidation and of oxygen bond energy on the degree of cobalt molybdate reduction has been investigated by pulse and caloremetric methods. It has been found that upon reduction, the selectivity to acrolein and the oxygen bond energy increase. The steady state under the conditions examined is characterized by 22% surface reduction and the presence of uniform oxygen with a bond energy of about 85 kcal/mol.

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. , . 22% 85 /.

     

Influence of water vapor on propylene oxidation on VMo catalyst

The dependence of reaction rates for acetone and acetic acid formation on the concentration of water vapor is determined on the basis of the participation of surface hydroxy groups and Brönsted acid centers of the catalyst.

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Investigation of propylene oxidation on multicomponent a Bi-and Mo-based oxide catalyst

It has been established that porpylene oxidation to acrolein on a multicomponent oxide catalyst containing Mo, Bi, Fe, Ni, Co, K, P and SiO₂ follows an alternating oxidation-reduction mechanism and involves the participation of lattice oxygen with the bond energy of about 280 kJ/mol.

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, Mo, Bi, Fe, Ni, Co, K, P SiO₂ 280 /.

     

Binding energy of oxygen to the surface of promoted V?Mo?O catalysts for acrolein oxidation to acrylic acid

It has been established that P, Cs and Cu additives to V–Mo–O catalysts affect essentially both binding energy of surface oxygen and mobility of bulk oxygen.

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P, Cs Cu V–Mo–O .

     

Ammoxidation of ethane on V-Mo-Nb oxide catalysts

Summary Catalytic and physicochemical properties of V-Mo-Nb oxide catalysts (V_0.3Mo₁Nb_x, where x = 0.05, 0.15, 0.22, and 0.27) have been studied in the ammoxidation of ethane. An increase in the Nb content in the samples is accompanied by an increase in the catalytic activity and selectivity to acetonitrile. It was established that a triple Mo₅O₁₄-like phase with a variable composition (V_{0.23 ±0.3}Mo₁Nb_x, where х = 0.2?0.37) acts as an active component in the catalyst.</o:p>     

IR spectroscopic and calorimetric study of water and formic acid adsorption on a vanadium-titanium catalyst

Kinetics and Catalysis - Formaldehyde is oxidized to formic acid at a high selectivity over vanadium -titanium catalysts. IR spectroscopic and calorimetric techniques were used for studying the...