Xylene Isomerization over Beta Zeolites in Liquid Phase

• Type: Article in International Scientific Journal
• Date: 2018

Authors

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

Journal

Title: Industrial & Engineering Chemistry Research

Vol. 57

Pages: 5568-5579

ISSN: 0888-5885

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 6 Citations

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12