Accurate High‐Pressure Measurements of Carbon Monoxide's Electrical Properties

Abstract

Accurate measurements of carbon monoxide's electrical properties were carried out at high pressure for the first time enabling stringent comparisons with theoretical values calculated ab initio. Dielectric permittivity measurements were conducted utilising a microwave re-entrant cavity resonator over the temperature range from (255 to 313) K and at pressures up to 8 MPa with a relative combined expanded uncertainty (k=2) less than or equal to 52 ppm. The new data enable carbon monoxide's molar polarizability to be correlated within 0.5 %, significantly improving upon existing literature data, which have a relative scatter of about 10 %. The measured molecular polarizability and electric dipole moment of carbon monoxide were determined to be 2.176×10 C m J and 0.107 D. Literature values from ab initio calculations for these properties are within 0.28 % and 3.9 %, respectively, of the measured quantities. Moreover, our measurement of the electric dipole moment at finite temperature agrees within 2.2 % with the value derived from accurate spectroscopic measurements for the ground rovibrational state. The second dielectric virial coefficient of carbon monoxide was determined experimentally for the first time to be b =(1.015±0.044) cm mol , which compares reasonably with ab initio estimates.

Synthesis, electronic nature, and reactivity of selected silylene carbonyl complexes

“…A larger Ga δ + –X δ − dipole moment would interact more favorably with a smaller C δ + –O δ − dipole moment. Free CO has a small dipole moment of 0.107 D, 28 pointing towards the carbon atom ( i.e. , δ − CO δ + ) while carbonyls with C–O double bonds have larger dipole moments (with the partial negative charge on oxygen).…”

Dew Points, Dielectric Permittivities, and Densities for (Hydrogen + Carbon Dioxide) Mixtures Determined with a Microwave Re-Entrant Cavity Resonator

“…Using these data, the polarizability mixing rule of Harvey and Prausnitz 21 was applied to convert experimental dielectric permittivities into mixture molar densities. It has previously been demonstrated by Tsankova et al 18,20 that such an approach can be very effective for gas mixtures containing not only nonpolar 18 but also polar fluids. 20 The results reported in this work were compared with the GERG-2008 9 equation of state, the cubic PR, 7 and SRK 8 equations of state as well as with other experimental data found in the literature.…”

“…It has previously been demonstrated by Tsankova et al 18,20 that such an approach can be very effective for gas mixtures containing not only nonpolar 18 but also polar fluids. 20 The results reported in this work were compared with the GERG-2008 9 equation of state, the cubic PR, 7 and SRK 8 equations of state as well as with other experimental data found in the literature.…”

“…recently reported data for refrigerants. In our previous work and with respect to the investigation of mixtures relevant to CCS-processes, a microwave re-entrant cavity resonator was deployed to determine key properties of, for example, (Ar + CO 2 ) and (CO + CO 2 ) as well as for measurements of CO’s electrical properties, as described in detail by Tsankova et al − …”