Solubility of methane in aqueous solutions of triethylenediamine

Quantitative Raman spectroscopic investigation of geo-fluids high-pressure phase equilibria: Part II. Accurate determination of CH4 solubility in water from 273 to 603 K and from 5 to 140 MPa and refining the parameters of the thermodynamic model

“…Table 4 shows the deviations of the optimized model from experimental data of the CH 4 solubility in water at temperatures from 273.15 to 603.15 K and pressures from 5 to 140 MPa, at pressures below 5 MPa, and at pressures above 140 MPa or temperatures above 603.15 K, respectively. As can be seen from Table 4, the predictions of pressures below 5 MPa are in good agreement with Culberson and Mcketta [14], Amirijafari and Campbell [8], Ben-Naim et al [18], Wiesenburg and Guinasso [21], Muccitelli and Wen [22], Cosgrove and Walkley [23], Yokoyama et al [26], Chapoy et al [33], Kim et al [35], most of Rettich et al [24], and most of Wang et al [27], indicating that the model can be extrapolated to 1 atm. Price [20] also reported solubility data at P-T ranges of 141.…”

Selective CO Production by Photoelectrochemical Methane Oxidation on TiO2

“…The solubility is expected to be ca. 0.0010 mol/kg. , A representative current voltage curve is plotted in Figure S2 in the SI, where the turn-on potential was 0.2 V vs RHE (reversible hydrogen electrode). A stability test was carried out at 0.6 V vs RHE (Figure S3), and no obvious decay was observed during the first 15 h. Under our experimental conditions, the measured anodic photocurrents could be due to CH 4 oxidation, H 2 O oxidation, or both.…”

“…At 0.4 V vs RHE, CO accounts for 81.9% of all charges other than O 2 formation. Given the low concentration of CH 4 (0.0010 mol/kg) under STP, , H 2 O oxidation is expected to compete favorably in receiving photogenerated holes, which explains the relatively high yield of O 2 . The yield of CH 4 oxidation (such as CO) is expected to be readily improved by increasing the partial pressure of CH 4 .…”