AMPEROMETRIC METHOD FOR MEASURING THE CONCENTRATION OF HYDROGEN IN AIR Russian patent published in 2023 - IPC G01N27/407 

FIELD: gaseous media analysis.

SUBSTANCE: invention relates to the analysis of gaseous media and can be used to measure the concentration of hydrogen in air and other oxygen-containing media. The flow of the analyzed air is purified from water vapor and reducing agents by passing it through a zeolite, an electrochemical cell with a cavity formed by two gas-sheet interconnected disks of a solid proton-conducting solid electrolyte of CaZrO₃ composition, between which there is a capillary, is placed into the stream of purified hydrogen-containing air on the electrodes a voltage is applied from a catalytically active electron-conducting material deposited on opposite surfaces of one of the disks, whereby hydrogen ions are pumped out of the cell cavity through a solid electrolyte, formed as a result of the electrolysis of moisture formed in the process of hydrogen oxidation with air oxygen, into the air flow washing the cell, and when the steady state is reached, the limiting diffusion current is measured, the value of which determines the concentration of hydrogen in the analyzed air according to the formula:

where: F is the Faraday constant, C/mol; R is the universal gas constant, J/mol⋅K; D_(H2O) - diffusion coefficient of hydrogen in air, cm2/s; X_(H2) is the mole fraction of hydrogen in air; S is cross-sectional area of the capillary, mm2; P is the total pressure of the gas mixture, atm; T is the analysis temperature, °C; L is capillary length, (mm); Icm is limiting current, A.

EFFECT: method makes it possible to measure the hydrogen content in the air even in the presence of moisture and reducing agents in it.

1 cl, 4 dwg