Hydrogen and methane were measured after the experiment was started at 4, 6, 8, 10, 12 h and every 24 h by a gas chromatography system (Varian STAR 3400, USA) equipped with a thermal conductivity detector.
Diffusion coefficients of carbon dioxide and methane were measured by measuring the rate of gas absorption in a high-pressure windowed cell.
The derived solubility and diffusivity of a series of probe gases including helium, hydrogen, neon, argon, krypton, oxygen, nitrogen, carbon dioxide and methane were measured and compared with molecular simulation predictions.
The lifetime deactivation patterns of a microzeolite-based 6wt%Mo/HZSM-5 in the non-oxidative dehydroaromatization of methane were measured first at 1073 K and a space velocity of 12,000 ml/g-Cat/h in continuous CH4-feeding, cyclic 5 min CH4 5 min He feed switch and cyclic 5 min CH4 5 min H2 feed switch modes.
δ13C of PCE, trichloroethylene (TCE) and cis-1,2-dichloroethylene (DCE), δ13C and 14C of vadose zone CO2 and sediment organic matter, and δ13C, 14C, and δD of methane were measured using a GC-isotope ratio mass spectrometer or accelerator mass spectrometer.
Organic acids were measured by high-performance liquid chromatography, and hydrogen and methane were measured by gas chromatography, as described previously (Stams et al. 1993).
The activity for the combustion of methane was measured under stoichiometric and oxidant conditions.
During the test, only methane was measured as carbon dioxide was scrubbed off from the produced gas with the aid of concentrated NaOH.
The catalytic activity of Pd/Al18B4O33 in the complete oxidation of methane was measured between 300 and 900 °C and compared with that of Pd/Al2O3.
The four-phase coexistence curves for the structure-H hydrates of methylcyclohexane and cis-1,2-dimethylcyclohexane in the presence of methane are measured in the temperature range 274.09 288.29 K and pressure range 1.42 8.89 MPa.
Methane was measured by gas chromatography, taking a 0.3 ml sample from the culture headspace, at the pressure in the culture tube, and injecting it into an Aerograph 660 (Varian Associates, Palo Alto, CA, USA) fitted with a Porapak Q 80/100 mesh column (Waters Corporation, Milford, MA, USA) and a thermal conductivity detector operated at 100°C.
