Xylene Isomerization over Beta Zeolites in Liquid Phase

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Qian Shi (Autor) Outra; Jonathan C. Gonçalves (Autor) Outra; Alexandre F. P. Ferreira (Autor) FEUP; Marta G. Plaza (Autor) Outra; Alírio E. Rodrigues (Autor) FEUP

Revista

Título: Industrial & Engineering Chemistry Research

Vol. 57

Páginas: 5568-5579

ISSN: 0888-5885

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 6 Citações

Outras Informações

ID Authenticus: P-00N-XF9

DOI: 10.1021/acs.iecr.8b00585

Abstract (EN): An experimental study of xylene isomers interconversion (isomerization) kinetics was conducted to gain a deeper insight into the field. Two beta zeolites with SiO2/Al2O3 ratio of 35 (BEA35) and 38 (BEA38) were used as catalysts for the performed experiments. The isomerization reactions were carried out under the following conditions: 513, 493, 473, and 453 K at 2.1 MPa in liquid phase. It was verified that all reactions were in the kinetic-controlled regime. Kinetic constants were estimated with four different models; two of them were based on the xylene isomerization thermodynamic equilibrium from the literature. The linear reaction scheme, which does not consider the direct conversion between p- and o-xylene, presented a better fit to the experimental values. Higher conversion of p-xylene was observed when compared with the conversion of the other two isomers. This may be attributed to its smaller molecular size. BEA35 presented better performance due to its higher amount of Bronsted acid sites. Finally, activation energies over the two catalysts, estimated through Arrhenius equation, presented similar values.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12