Methane/hydrogen mixtures

Smith GC (1991) X-ray imaging with gas proportional detectors. Synch Radiat News 4 24-30 Somayazulu MS, Finger LW, Hemley RJ, Mao HK (1996) High-pressure compounds in methane-hydrogen mixtures. Science 271 1400-1402... 

The indirect confirmation of these conclusions can be found in, where it was shown that methane - hydrogen mixtures can be effectively separated by means of methane hydrate formation at a pressure less than 5.0 MPa and temperature about 0 C. 

Ni-hydrotalcitc catalyst was reduced at 600°C for 4h in a hydrogen-nitrogen mixture in a fixed-bed reactor. A methane-hydrogen mixture was pumped through that reactor at 600°C. Carbon nanofibers were washed in concentrated HNO, for 1 h, then washed with water and dried. The washing procedure was repeated twice. 

The presence of impurities can increase nucleation densities. Higher nucleation rates can be obtained with halogen/hydrogen mixtures than with methane/hydrogen mixtures. The presence of a large amount of oxygen in a plasma etches the sp carbon phase which nucleates more easily than diamond, and the Quality and yield of diamond particles may be improved... 

Example 7 Estimation of Rate Coefficient An adsorption bed is used to remove methane from a methane-hydrogen mixture at 10 atm (abs.) (10.1 bar) and 25°C (298 K), containing 10 mol % methane. Activated carbon particles having a mean diameter = 0.17 cm, a surface area A = 1.1 X lO cmVs, a bulk density pj = 0.509 g/cm, a particle density pp = 0.777 g/cm, and a skeletal density pj = 2.178 g/cm is used as the adsorbent. Based on data of Grant et al. [AIChE8,403 (1962)], adsorption equiUbrium is represented by n = 2.0 X + KjPjJ moFg adsorbent, with = 0.346 atm"f Estimate the rate coefficient and determine the controlling rate factor for a superficial velocity of 30 cm/s. 

VISCOSITY OF METHANE-HYDROGEN MIXTURES AT 273-523 K. UNDER PRESSURES UP TO 490.3 X 10 TO THE FIFTH POWER NEWTONS/M SQUARED. 

Yang Q, Zhong C (2(X)6) Molecular simulation of carbon dioxide/methane/hydrogen mixture adsorption in metal-organic frameworks. J Phys Chem B 110 17776-17783... 

Gre] Measiuement of carbon content using Woesthoff conductimetric apparatus with methane-hydrogen mixtures. Determination of carbon solubiUty in Fe alloy with 1.91 mass% Cu at 1050°C and calculation of the interaction parameter. 

Kinetic studies of carbonization of a methane/carbon tetrachloride mixture at low pressure (2 kPa) at r< 800°C allowed one to assume that pyrocarbon was formed from chlorinated intermediate species with apparent activation energy of 180 kJ/mol (Gun ko and Leboda 2002). At higher temperatures, the apparent activation energy was lower (140 kJ/mol) and unsaturated hydrocarbons were the most probable carbon precursors (Feron et al. 1999). Chemical vapor infiltration of pyrocarbon was studied at 1100°C and methane or methane/hydrogen mixture pressures ranging from 5 to 100 kPa on porous alumina ceramic as a substrate (pore diameters from 1 to 36 pm)... 

Benzinger, W. and Hiittinger, K.J. 1999b. Chemistry and kinetics of chemical vapor infiltration of pyrocarbon-IV. Investigation of methane/hydrogen mixtures. Carbon 37 931-940. 

R.K. Cheng, A.K. Oppenheim, Autoignition of methane-hydrogen mixtures. Combust. Flame 58(2), 125-139 (1984)... 

The syntheses of VC and VN illustrate the typical differences in reaction of oxides with ammonia and methane>hydrogen mixtures. Because the ammonia decomposition... 

---