Palladium and platinum catalysts supported on carbon nanofiber coated monoliths for low-temperature combustion of BTX

• Tipo: Artigo em Revista Científica Internacional
• Data: 2009

Autores

morales-torres, s (Autor) Outra; perez-cadenas, af (Autor) Outra; kapteijn, f (Autor) Outra; carrasco-marin, f (Autor) Outra; maldonado-hodar, fj (Autor) Outra; moulijn, ja (Autor) Outra

Revista

Título: Applied Catalysis B: Environmental

Vol. 89

Páginas: 411-419

ISSN: 0926-3373

Editora: Elsevier

Indexação

ISI Web of Knowledge - 28 Citações

Scopus - 31 Citações

Outras Informações

ID Authenticus: P-008-PHY

DOI: 10.1016/j.apcatb.2008.12.021

Abstract (EN): In this work carbon nanofiber (CNF)-coated monoliths with a very thin, homogeneous, consistent and good adhered CNF layer were obtained by means of catalytic decomposition of ethylene on Ni particles. The catalytic behaviour of Pt and Pd supported on the CNF-coated monoliths was studied in the low-temperature catalytic combustion of benzene, toluene and m-xylene (BTX) and compared with the performance of Pt and Pd supported on gamma-Al(2)O(3) coated monoliths. The catalysts supported on CNF-coated monoliths were the most active, independent of the metal catalyst or the type of the tested aromatic compound. TPD experiments showed that the gamma-Al(2)O(3) phase retained important amounts of the water molecules produced during the reaction. When water vapour was supplied to the reactant flow, the activity of Pd catalysts decreased much stronger than the Pt ones, and the activity of the Pt catalysts supported on the gamma-Al(2)O(3) Was more affected than that of the catalysts supported on CNF. BTX combustion reactions seem to be catalyzed by Pt and Pd through different kinetic mechanisms, explaining why Pt catalysts always were more active than the Pd ones deposited on the same type of support. Pd catalyzed combustion of benzene is strongly inhibited by oxygen and by water. Catalysts supported on CNF-coated monoliths showed a selectivity to burn benzene better than toluene or m-xylene, attributed to a better aromatic-CNF surface interaction.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9