Carbon formation and gasification on metals. Bulk diffusion mechanism: A reassessment

[Display omitted] ► The mechanism for carbon formation from hydrocarbons on metals is reassessed. ► Original ideas and findings from David Trimm's group are highlighted. ► The roles of surface catalysis and carbon bulk diffusion are discussed. The mechanism for carbon formation from hydrocarbon...

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Bibliographic Details
Published in:Catalysis today 2011-12, Vol.178 (1), p.110-116
Main Authors: Lobo, L.S., Figueiredo, J.L., Bernardo, C.A.
Format: Article
Language:English
Subjects:
Bulk diffusion
carbon
catalytic activity
Filamentous carbon formation
gasification
hydrocarbons
mass transfer
Mass transfer dynamics
Mechanism
Solid state reactions
transition elements
Transition metals
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Summary:[Display omitted] ► The mechanism for carbon formation from hydrocarbons on metals is reassessed. ► Original ideas and findings from David Trimm's group are highlighted. ► The roles of surface catalysis and carbon bulk diffusion are discussed. The mechanism for carbon formation from hydrocarbons on transition metals, proposed 40 years ago, is reassessed, evaluating the role of surface catalysis and bulk diffusion. Under steady-state conditions, solid state reactions, which are essential to start-up the process, will be confined to carbon growth. The dynamics of carbon mass transfer is discussed, together with the thermodynamic equilibria prevailing at the metal–gas and metal–graphite interfaces. The reverse process of carbon gasification is also addressed.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2011.07.030