Kinetic and autocatalytic effects during the hydrogen production by methane decomposition over carbonaceous catalysts |
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| Authors: | David P. Serrano,Juan Á ngel Botas,Patricia Pizarro,Gema Gó mez |
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| Affiliation: | 1. Department of Chemical and Energy Technology, ESCET, Rey Juan Carlos University, c/ Tulipán s/n, 28933 Móstoles, Madrid, Spain;2. IMDEA Energy Institute, Avda. Ramón de la Sagra 3, 28935 Móstoles, Madrid, Spain |
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| Abstract: | The reaction kinetics of methane decomposition to yield hydrogen and carbon has been investigated comparing different types of carbonaceous catalysts: two ordered mesoporous carbons (CMK-3 and CMK-5) and two commercial carbon blacks (CB-bp and CB-v). The evolution of the reaction rate along the time has been analyzed concluding that it is governed by different and opposite events: reduction of active sites by carbon deposition, autocatalytic effects of the carbon deposits and pore blockage and diffusional constraints. A relatively simple kinetic model has been developed that fits quite well the experimental reaction rate curves in spite of the complexity of the involved phenomena. |
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| Keywords: | Hydrogen production Methane catalytic decomposition Carbonaceous catalysts Ordered mesoporous carbons CMK |
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