Oxidative dehydrogenation of n-butane on Cs doped nickel molybdate: Kinetics and mechanism

• Tipo: Artigo em Revista Científica Internacional
• Data: 1996

Autores

Luis Madeira (Autor) Outra; MaldonadoHodar, FJ (Autor) Outra; Portela, MF (Autor) Outra; Freire, F (Autor) Outra; MartinAranda, RM (Autor) Outra; Oliveira, M (Autor) Outra

Revista

Título: Applied Catalysis A: General

Vol. 135 Nº 1

Páginas: 137-153

ISSN: 0926-860X

Editora: Elsevier

Indexação

ISI Web of Knowledge - 16 Citações

Scopus - 14 Citações

Outras Informações

ID Authenticus: P-001-ESJ

DOI: 10.1016/0926-860x(95)00203-0

Abstract (EN): The oxidative dehydrogenation of n-butane over a highly selective catalyst (3% Cs doped alpha-NiMoO4) has been studied in order to understand the mechanism of the reaction. The catalyst characterization was carried out by BET, X-ray diffraction (XRD), coupled plasma spectroscopy (ICP), atomic absorption (AA), X-ray fluorescence (XRF), IR and X-ray photoelectron spectroscopy (XPS). All the results showed an atomic ratio of Mo/Ni = 1 and a cesium surface concentration of 3%. The kinetic tests were carried out between 773 and 833 K changing the contact time and the partial pressure of both butane and oxygen. Only dehydrogenation products (1-butene, 2-butenes (cis and trans) and butadiene) and CO and CO2 were observed under all experimental conditions. The experimental results can be correlated using a redox model. Two active sites were observed by CO2-TPD, which would be responsible for the formation of two different adsorbed intermediates of butane. It is proposed that in the more basic sites 1-butene would be formed which reacts partially to butadiene and in the less basic sites the formation of the 2-butene isomers would occur.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 17