METHOD OF DETERMINING KINETIC PARAMETERS CHARACTERIZING PROCESS OF GAS PHASE OXYGEN EXCHANGE IN MIXTURE OF MOLECULAR OXYGEN AND WATER WITH OXIDE MATERIALS Russian patent published in 2024 - IPC G01N7/14 

FIELD: chemical kinetics.

SUBSTANCE: disclosed is a method for determining kinetic parameters characterizing the process of exchange of oxygen of a gas phase in a mixture of molecular oxygen and water with oxide materials, in which a mixture of the analyzed gas phase is passed through a flow reactor with a sample of the analyzed material and after establishing equilibrium between the sample and the analyzed gas phase at the selected values of temperature and partial pressure of the analyzed gas mixture, two or more pulses of the isotope-rich mixture are supplied, wherein the method includes analyzing the isotopic composition of the analyzed gas phase at the outlet of the reactor with the sample and calculating the kinetic parameters characterizing the process of exchanging oxygen of the analyzed gas phase with oxide materials, where a sample of the analyzed material is placed in a flow reactor with a bubbler connected to it at the inlet and filled with water, a mixture of a carrier gas is passed through the bubbler and the flow reactor, containing inert gas and molecular oxygen with specified ratio of consumption of inert gas and molecular oxygen, following the establishment of equilibrium between the oxide material sample and the gas phase at selected initial values of the total flow rate of the carrier gas and temperature one or more pulses of the isotope-enriched mixture are fed into the flow reactor with the sample with continuous moistening of the carrier gas with water vapor, after each sequence of pulses, the total flow rate of the carrier gas is changed and the sequence of pulses of the isotope-rich mixture is repeated, number of changes in the total flow rate of the carrier gas is used to control the number of obtained experimental points at two or more different values of the total flow rate of the carrier gas, wherein the method involves analyzing the isotopic composition of molecular oxygen ¹⁶O₂, ¹⁶O¹⁸O, ¹⁸O₂ and water H₂¹⁶O and H₂¹⁸O of the gas phase at the outlet of the reactor with the sample when each pulse of the isotope-rich mixture is supplied, during analysis based on the ratio of the content of the oxygen isotope in the pulse and in the water before and after the pulse passes over the sample at different values of the total flow rate of the carrier gas obtaining molar fractions of oxygen and water isotopologues in gas phase on exposure time, according to the processing results of which kinetic parameters are calculated, which characterize the process of interphase exchange of oxygen between O₂ and oxides, between O₂ and H₂O and between H₂O and oxides, as well as rates of five types of oxygen exchange in a mixture of molecular oxygen and water with oxide materials.

EFFECT: invention enables to determine the rates of interphase exchange of oxygen between O₂ and oxides, between O₂ and H₂O and between H₂O and oxides, as well as rates of five types of oxygen exchange in a mixture of molecular oxygen and water with oxide materials.

1 cl, 5 dwg, 1 ex