Propyne hydrogenation kinetics over surfactant-stabilized palladium nanoclusters

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

Lúcia Brandão (Autor) FEUP; Fritsch, D (Autor) Outra; Adélio Mendes (Autor) FEUP; Luis Madeira (Autor) FEUP

Revista

Título: Industrial & Engineering Chemistry Research

Vol. 46 Nº 16

Páginas: 377-384

ISSN: 0888-5885

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 9 Citações

ISI Web of Science

Scopus - 8 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

ID Authenticus: P-004-C7R

DOI: 10.1021/ie0602761

Abstract (EN): The kinetics of propyne hydrogenation over surfactant-stabilized palladium nanoclusters was studied in a batch reactor under isothermal conditions (308 K). The method of initial rates was adopted to elucidate the reaction mechanism and a rate equation was derived. Although the methodology employed does not exclude other reaction schemes, it was found that experimental rate data agree well with a Langmuir-Hinshelwood mechanism that involves noncompetitive adsorption between propyne and hydrogen for the catalyst surface, where hydrogen addition in the surface reaction(s) is the limiting step. Nonlinear model fitting to initial rate data provided the kinetic parameters of the rate equation (k (mol center dot g(Pd)(-1)center dot s(-1)center dot bar(-2)) = 4.1; K-C3H4 (bar(-1)) = 8.7 x 10(2); and K-H2 (bar(-1)) = 1.0 x 10(-5)). Finally, experimental compositions of the reaction mixture over time, as well as the overall advancement history, were compared favorably with the kinetic model through integration of the mass balance in the batch reactor.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8