Catalytic decomposition of methane on Raney-type catalysts

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

A. F. Cunha (Autor) Outra; J. J. M. Órfão (Autor) Outra; J. L. Figueiredo (Autor) Outra

Revista

Título: Applied Catalysis A: General

Vol. 348 Nº 1

Páginas: 103-112

ISSN: 0926-860X

Editora: Elsevier

Indexação

ISI Web of Knowledge - 60 Citações

ISI Web of Science

Scopus - 54 Citações

INSPEC

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Tecnológicas > Tecnologia > Tecnologia química

Outras Informações

ID Authenticus: P-003-W3V

DOI: 10.1016/j.apcata.2008.06.028

Abstract (EN): The catalytic decomposition of methane into COx-free hydrogen and filamentous carbon was investigated on Raney-type catalysts. Catalysts performance was assessed by comparing the measured conversions with the equilibrium values and with selected results reported recently. The activity, selectivity and stability were dependent on the alloy composition and preparation method (conventional or quenched alloy types), as well as the operating conditions. Textural properties, chemical compositions and catalyst performances were determined, and the carbon deposits were characterized by different techniques. Ni and Co catalysts obtained from Raney-type alloys prepared by quenching showed better performance for methane decomposition than conventional systems, with conversions approaching equilibrium. The stability of the catalysts could be extended by increasing the contact time and by hydrogen pre-treatment of the catalysts. The carbon deposits consist mostly of carbon nanofibres and carbon nanotubes. In addition to the high activity and stability for methane decomposition, there was no generation of carbon oxides, which makes these catalysts suitable for the production of pure hydrogen for fuel cells.

Idioma: Inglês

Tipo (Avaliação Docente): Científica