Electrochemical reduction of CO2 in a mixed supercritical fluid

Article Abstract:

It has been possible to show that CO2 can be reduced electrochemically in aprotic mixtures in the supercritical phase. The nature of the electrode material has an impact on the kinetics and products of CO2 electroreduction.

Carbon dioxide, Thermal properties, Electrochemistry, Supercritical fluid chromatography

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Solvent properties of liquid and supercritical 1,1,1,2-tetrafluoroethane

Article Abstract:

The polarizability parameter of 1,1,1,2-tetrafluoroethane (HFC 134a) has been computed as a function of temperature and pressure. HFC 134a is an environmentally-safe refrigerant with low critical temperature and pressure points. Results indicate that the polarizability of HFC 134a changes when the density of the fluid is reduced which generates three distinct density regions. It has been demonstrated that the solvent properties of HFC 134a can be simulated over a wide range of densities in the supercritical and liquid regions when the solvent molecules are assumed as simple dipoles.

Analysis, Refrigerants

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Double layer structure in a supercritical fluid

Article Abstract:

Research was conducted to examine the first double layer capacitance calculations in a polar supercritical fluid. It was observed that the capacitance of a tetrabutylammonium tetrafluoroborate (TBA BF4) electrolyte in supercritical difluoromethane (HFC 32) at a platinum electrode is strongly dependent on fluid density. The diffuse layer collapses when the pressure is lowered toward the critical value and a pure Helmholtz response is apparent while at high pressures, the capacitance-potential plots display a double layer response similar to that in the liquid state.

Electrolytes, Supercritical fluid extraction, Layer structure (Solids)

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