Methane cent hydrogen atoms

The principal methods of gas activation are thermal and electrical much less common are chemical and photochemical activation. In the most commonly used thermal activation technique - the hot filament technique - a W or Ta wire is arranged in the immediate vicinity of the substrate to be coated by diamond (Fig. 1). The wire is heated until it reaches the temperature when H2 molecules dissociate readily. The gas phase is a mixture of a carbon-containing gas (e.g. methane, acetone or methanol vapor), at a concentration of a few per cent, and hydrogen. Upon the contact of the gas with the activator surface, excited carbon-containing molecules and radicals are produced, in addition to the hydrogen atoms. They are transferred to the substrate surface, where deposition occurs. Table 2 gives an indication of the hot-filament deposition process parameters. 

Formula, CH4.—The analysis of methane shows that it contains approximately 75 per cent carbon and 25 per cent hydrogen. This together with the facts in regard to its density and molecular weight give us the data for the calculation of the composition formula for the compound which has been established as CH4, i.e., one atom of carbon and four atoms of hydrogen. The reaction with oxygen may be written therefore as ... 

Natural gas of the southwestern United States contains, in addition to methane, several per cent ethane and lesser percentages of higher molecular weight hydrocarbons, up to and including pentane. The atomic ratio of hydrogen to carbon in this fuel is about 3.80. Reforming this... 

Hydrocarbons also demethylate in the presence of hydrogen over nickel or cobalt catalysts at 260°C and pressures of 100 -500 psig to yield methane and a hydrocarbon containing fewer carbon atoms. Thus, neohexime g ves neopentane (77 per cent), methane, butanes, and pentanes. ... 

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