Abstract
<p>Methane pyrolysis at the temperature range of 550-1000 °C in gas flow reactor with fixed bed of mixed catalysts based on carbon materials of various structure (fullerene cocoons, fullerene black, vacuum black, cathode deposit, onion-like carbon, glassy carbon, carbon fibers, mineral shungite and graphite) has been studied. Methane pyrolysis products, including stoichiometric amount of hydrogen are C<sub>3</sub>-C<sub>4</sub> alkanes, C<sub>2</sub>-C<sub>4</sub> alkenes, aromatics and pyrolytic carbon. Methane pyrolysis is carried out both on a catalytic surface and in a volume and contribution of the surface is determined by pyrolysis temperature. Materials with curved carbon surface show an activity in methane dehydrogenation at lower temperatures, than materials with planar basic structure elements. Materials with a small specific surface area favor methane aromatization at 950–1000 °C with formation of mainly benzene, toluene and naphthalene. The primary activation of C–H bond in methane at temperatures of lower than 850 °C, as well as the multiple dehydrogenation conversions resulting in the formation of pyrolytic carbon and its precursors (aromatics), are, probably, heterogeneous reactions.</p>
Highlights
The data on comparative catalytic activity of different carbon materials in the reaction of methane pyrolysis are practically absent
In the present work we report of methane conversions over wide range of mixed catalysts based on carbon materials in a gas flow reactor under identical experimental conditions, that has allowed to quantitatively compare activities of the catalysts and to make some conclusions on the mechanism of methane pyrolysis
Carbonaceous materials are ranged according to the temperature point when methane pyrolysis starts and the conversion degree η reaches 0.1 %, see inset in Fig. 1, Table 1
Summary
The data on comparative catalytic activity of different carbon materials in the reaction of methane pyrolysis are practically absent. Both all studied carbonaceous materials and the diluent (quartz) exhibited an activity in methane pyrolysis at different temperatures with formation of hydrogen, hydrocarbons and pyrolytic carbon.
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