Kinetics and mechanism of catalytic carbon gasification

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Luís Sousa Lobo (Autor) Outra; Sónia A. C. Carabineiro (Autor) FEUP

Revista

Título: Fuel

Vol. 183

Páginas: 457-469

ISSN: 0016-2361

Editora: Elsevier

Indexação

ISI Web of Knowledge

ISI Web of Science

Scopus

INSPEC

Projetos Associados

LSRE-LCM - Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais

Outras Informações

DOI: 10.1016/j.fuel.2016.06.115

Abstract (EN): The evidence of the carbon bulk diffusion mechanism, operating in catalytic carbon gasification, is summarized. Linking visual and structural observations (transmission electron microscopy and X-ray diffraction) with comprehensive kinetic studies offers a good basis to understand the details of the phenomenological behavior. The role of the catalyst nanoparticles in catalytic coal/coke gasification and in graphene reactions is briefly reviewed. Knowledge of the solid-state phases operating under steady-state reaction and of the ‘‘sintering like” catalyst-carbon contact is essential to understand the most likely reaction sequence: 1st step - carbon dissolution; 2nd step - C bulk diffusion; 3rd step - surface reaction of emerging C atoms with the reactant gas. Kinetics and preliminary solid-state changes observed in graphite gasification and in coke/coal gasification leads to the conclusion that they follow the same mechanism. Using an analogy with proton exchange membranes in fuel cells: catalytic carbon gasification is promoted by carbon exchange moving nanoparticles. A better understanding of the mechanism may lead to improvements in industrial processes.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 13