2019, №2

сс. 116-134

Some Methodological Aspects of the Study of Chemical Processes in Water Fluid Media

2019, №2

сс. 116-134

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M.Yu. Sinev, Yu.A. Gordienko, E.A. Ponomareva, Yu.D. Ivakin

Key words: water fluid, supercritical water, evaporation, condensation, hydrogen oxidation, kinetics, mechanism, catalysis

Some aspects of the experimental study of processes involving water fluids at
temperatures approaching the critical (647 K) and above it in a static mode are
considered. Particular attention is paid to the possible occurrence of artifacts and
misinterpretations of the results associated with temperature gradients and uncontrolled
effects of evaporation-condensation of water. The role of the walls of metal structural
elements of the reactor (autoclave) as a catalyst for reactions involving water fluids
and heat transfer processes on the measurements of thermal effects is analyzed. It is
shown that a thermometric study of the dynamics of gas-phase reactions involving
water vapor and supercritical fluid without measuring the pressure in the system and
its chemical composition leads to uncertainty of the results and the inability to identify
the most important kinetic features and mechanism of the process.

doi:10.1134/S1990793119080074