By Wali, Mohan K. (ed.) / Sutherland, David M.
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M. Eng. 35, 169. , and Schmidt, L, (1996), Science, 271, 1560. R. Catal. A: General, 221, 379. , Aasberg-Petersen, K. Div. 45 (2) 186. L. Eng. 3 (1) 56. L. R. Today, 63, 159. S. Catal. 136, 441. , Venkataraman, V. (2003) in “Fundamentals of Gas to Liquids”, Petroleum Economist, p. 24. R. Proc. J. ), Copenhagen 2003, p. 25. O. hu Abstract: The effects of Mo2C/ZSM-5 found to be active in the aromatization of methane has been investigated on the reactions of various hydrocarbons. It was found that Mo2C enhances the conversion of hydrocarbons and promotes the formation of aromatics, benzene and xylene.
Accordingly, we may conclude that the presence of Mo–O species is not required for the activation of methane and for the further reaction steps. Mo2C on the ZSM-5, produced by the transformation of highly dispersed MoO3, is the active site for the cleavage of the C–H bond in the methane molecule. This explanation, however, is not sufficient as Pt metals on ZSM-5 even more active towards methane activation and decomposition without giving benzene or other aromatic compounds. Therefore we have to assume that Mo2C is active for the first step of the methane decomposition, CH4 ' CH3 +H (2) but it is far less active for the decomposition of CH3 and CH2 species produced Molecular Chemistry of Alkane Activation CH3 = CH2 + H CH2 = C + H2 29 (3) (4) compared to the Pt metals.
G. g. water and energy). The variable costs depend on the actual consumption and price of the various streams needed for the manufacture. They could be minimised by improving the plant operation, improving the conversion technology or utilising cheaper feedstock. x fixed costs, which include labour, maintenance and overhead as well as a provision for recovering the investment of the plant and the lost interests. The fixed costs depend largely on the size, complexity and reliability of the plant.