Methane-oxygen mixtures

Montecatini Process. This partial combustion process operates at higher pressure, 405—608 kPa (4—6 atm), than the BASF and SBA processes. The burner dimensions are proportionately smaller. Because of the higher pressure, the danger of premature ignition of the methane—oxygen mixture is higher so that 2 vol % of steam is added to the gas mixture to alter the flammabiUty limits. 

The explosive properties of liquid methane-oxygen mixtures were determined [8], Dining investigation of an explosion in a portable air liquefaction-separation plant, hydrocarbon oil was found in a silica filtration bed [9], The mechanism of slow heterogeneous accumulation of hydrocarbons dissolved in trace amounts in liquid oxygen on the liquid evaporator surfaces is discussed. It was concluded that months of continuous evaporation would be required to attain explosion-hazardous levels in real evaporators [10],... 

Calculate the reaction kinetics of a methane oxygen mixture diluted with... 

Formaldehyde is produced in the early stages of methane oxidation. It has recently been found that formaldehyde induces ignition in methane-oxygen mixtures 67). 

Methane-oxygen mixtures have also been studied by laser-excited fluorescence, as have NO-CH4 mixtures. Yardley and Moore [274] find for the V-V exchange probability from Os to CH4 a value of 2.0 x 10-2 per collision at 297°K. 

If the oxide component is removed from the reactor, no conversion of reactants is observed indicating a very low activity of the metal filament in methane oxidation. No reaction occurs also when ethane is added to the methane-oxygen mixture. However, if both oxide and metal components are present in the reactor, some part of ethane undergoes conversion causing additional consumption of oxygen (Table 1). 

Auger Electron Spectroscopic Analysis of the surface of powder catalysts and catalytic beads exposed to HMDS in the presence of methane+oxygen mixture (from ref. 3)... 

In these studies, yttria-stabilized zirconia (YSZ) thin films, NiO-i-YSZ cermet, and modified Lao.rSro.jMnOj (LSM) perovskite were used as electrolyte, anode and cathode, respectively. The details of the single cell preparation can be found elsewhere [7]. Specially, Ceo,gSmo,202-6 nano-grains were introduced to porous LSM backbone via a wet infiltration method to improve the cell performance in methane-oxygen mixture [7]. 

Methane-Oxygen Mixture, Journal of Physical Chemistry B 103, 5227, 1999. 

Jia, D., and Su, W. (2009) A novel design of single-chamber SOFC micro-stack operated in methane-oxygen mixture. Electrochem. Commun., 11 (2), 347—350. 

Schneider A, Mantzaras J, Eriksson S Ignition and extinction in catalytic partial oxidation of methane-oxygen mixtures with large H2O and CO2 dilution. Combust Sd Technol 180 89-126, 2008. 

Elmasides C, Kondarides DI, Griinert W, Verykios XE (1999) XPS and FTIR Study of Ru/ AI2O3 and Ru/Ti02 Catalysts Reduction Characteristics and Interaction with a Methane-Oxygen Mixture. J Phys Chem B 103 (25) 5227-5239... 

Methane oxidation. In early work Sandler investigated the behaviour of a calcia-stabilized ziiconia (CSZ) cell with platinum and silver electrodes in the presence of methane-oxygen mixtures. The results indicated that the cell could be used as a methane detector device. Haaland also investigated the behaviour of platinum, silver and gold electrodes in the presence of methane-oxygen mixtures... 

A high selectivity of methanol formation is the main feature of the oxidation of rich methane—oxygen mixtures ([Ct J/iOJ = 10—30) at high pressures and moderate temperatures. The other two main liquid products of this process are water and formaldehyde. Although only trace amoimts of formaldehyde, if any, have been detected in a number of studies, it can be argued that this is most likely a result of its subsequent removal in secondary processes, including those on the surface of the reactor or catalyst. 

Tig [02]° (Fig. 3.44). The oxygen concentration exponent in this expression only weakly depended on the pressure, varying within 15%. The reason why the rate of the slow reaction in rich methane—oxygen mixtures features a negative dependence on the oxygen concentration will be discussed below. 

Although the existence of the NTC region and, respectively, cool flames in the oxidation of very rich methane—oxygen mixtures has not yet been demonstrated, this phenomenon was shown to take place for rich (up to [C3Fl8]/[02] = 23) propane—oxygen mixtures (Fig. 8.16) [165]. 

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