Methane of carbon monoxide

Methanation is one of a more general class of Fischer-Tropsch processes in which carbon monoxide and carbon dioxide are hydrogenated to form various light hydrocarbons and water. Although the primary reaction using a nickel on alumina catalyst is the methanation of carbon monoxide, appreciable side reactions can occur in the methanation system. The reactions in the methanation system are shown in Table I and include carbon dioxide... 

This order of activities was again based on activities per gram of catalyst. Vannice50 has determined the following order of specific activities for the methanation of carbon monoxide at 275 °C ... 

In 1975 Vannice published a comprehensive study of the kinetics of the methanation of carbon monoxide over various metals.45 He analysed his results in terms of a rate-determining step for the reaction involving the interaction of adsorbed CHOH species and adsorbed H atoms ... 

The foregoing discussion shows that the spectral pattern of chemisorbed carbon monoxide and the effect of adding constituents such as copper or dissolved hydrogen can be explained in a manner acceptable to most catalytic chemists. However it is not possible to outline a detailed mechanism for the methanization of carbon monoxide which similarly explains... 

The product spectrum is generally poor in branched hydrocarbons and is dominated by aliphatics and a-olefins. However, the specific nature of the catalysts greatly influences the result. For example, mthenium catalysts under very high pressure yield polymethylene with molecular weights up to 240 000. By way of contrast, nickel favors the methanization of carbon monoxide. 

M. Araki and V. Ponec. Methanation of Carbon Monoxide on Nickel and Nickel Copper Alloys. J. Catal. 44 439 (1976). 

Another purification method is the selective methanation of carbon monoxide where no additional air is required however, the yield of hydrogen is decreased as three molecules of hydrogen are consumed per molecule of CO. Furthermore, it is... 

Selective methanation of carbon monoxide does not require air addition to the reformate but suffers not only from competing CO2 methanation [148],... 

Nickel and ruthenium [342,343] catalysts are those most frequently under investigation for the selective methanation of carbon monoxide. The main issue of concern is that the concentration of carbon dioxide is much higher in the reformate compared with carbon monoxide and thus the catalyst used for carbon monoxide methanation has to be very selective. Normally, the operating window of methanation catalysts is relatively small, around 250 °C, because a trade-off is required between sufficient activity and selectivity. Well above 250 °C all methanation catalysts tend to be selective for carbon dioxide methanation. 

Kai, T., S. Furusaki and K. Yamamoto. Methanation of Carbon Monoxide by a Fluidized Catalyst Bed. J. Chem. Engng. 

The reactions involved in methanation of carbon monoxide and carbon dioxide can be represented by equations 13-12 and 13-13 ... 

Heats of Reaction and Equilibrium Constants for Methanation of Carbon Monoxide and Carbon Dioxide... 

Does the system behave as though one stoichiometrically-simple reaction (the methanation of carbon monoxide) is taking place Explain your answer. 

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