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Catalytic Disproportionation of Ethylbenzene over Ln-Modified HZSM-5 Zeolites

Mahmudov, K. T. / Kerimli, F. Sh. / Mammadov, E. S. / Gurbanov, A. V. / Akhmedova, N. F. / Mammadov, S. E.

A series of lanthanide (Ln) modified zeolites, Pr/HZSM-5, Gd/HZSM-5, Ho/HZSM-5, and Yb/HZSM-5 have been prepared and characterized by XRPD, IR, and atomic absorption spectroscopies. In Ln/HZSM-5, concentration of the Brønsted acid sites decreases with the increase of ionic radii of Ln (Pr > Gd > Ho > Yb) and with the Ln loading, while concentration of the Lewis acid sites increases. The conversion of EB and production of diethylbenzenes (DEBs) over the Ln/HZSM-5 catalysts and parent HZSM-5 have been studied using a flow fixed-bed reactor; the reaction temperature was varied from 300 to 450°C. The m-DEB and p-DEB isomers are the main products at the studied conditions. The highest yield of DEBs of ca. 22.2% (7.8% m-DEB and 14.4% p-DEB) with EB conversion of 42.4% was obtained over 5 wt % Yb-HZSM-5 catalyst at 400°C.

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Catalytic Disproportionation of Ethylbenzene over Ln-Modified HZSM-5 Zeolites

Mahmudov, K. T. / Kerimli, F. Sh. / Mammadov, E. S. / Gurbanov, A. V. / Akhmedova, N. F. / Mammadov, S. E.

A series of lanthanide (Ln) modified zeolites, Pr/HZSM-5, Gd/HZSM-5, Ho/HZSM-5, and Yb/HZSM-5 have been prepared and characterized by XRPD, IR, and atomic absorption spectroscopies. In Ln/HZSM-5, concentration of the Brønsted acid sites decreases with the increase of ionic radii of Ln (Pr > Gd > Ho > Yb) and with the Ln loading, while concentration of the Lewis acid sites increases. The conversion of EB and production of diethylbenzenes (DEBs) over the Ln/HZSM-5 catalysts and parent HZSM-5 have been studied using a flow fixed-bed reactor; the reaction temperature was varied from 300 to 450°C. The m-DEB and p-DEB isomers are the main products at the studied conditions. The highest yield of DEBs of ca. 22.2% (7.8% m-DEB and 14.4% p-DEB) with EB conversion of 42.4% was obtained over 5 wt % Yb-HZSM-5 catalyst at 400°C.

Catalytic Disproportionation of Ethylbenzene over Ln-Modified HZSM-5 Zeolites

Mahmudov, K. T. / Kerimli, F. Sh. / Mammadov, E. S. / Gurbanov, A. V. / Akhmedova, N. F. / Mammadov, S. E.

A series of lanthanide (Ln) modified zeolites, Pr/HZSM-5, Gd/HZSM-5, Ho/HZSM-5, and Yb/HZSM-5 have been prepared and characterized by XRPD, IR, and atomic absorption spectroscopies. In Ln/HZSM-5, concentration of the Brønsted acid sites decreases with the increase of ionic radii of Ln (Pr > Gd > Ho > Yb) and with the Ln loading, while concentration of the Lewis acid sites increases. The conversion of EB and production of diethylbenzenes (DEBs) over the Ln/HZSM-5 catalysts and parent HZSM-5 have been studied using a flow fixed-bed reactor; the reaction temperature was varied from 300 to 450°C. The m-DEB and p-DEB isomers are the main products at the studied conditions. The highest yield of DEBs of ca. 22.2% (7.8% m-DEB and 14.4% p-DEB) with EB conversion of 42.4% was obtained over 5 wt % Yb-HZSM-5 catalyst at 400°C.

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Title:

Catalytic Disproportionation of Ethylbenzene over Ln-Modified HZSM-5 Zeolites

Additional title:

Pet. Chem.

Contributors:

Mahmudov, K. T. (author) / Kerimli, F. Sh. (author) / Mammadov, E. S. (author) / Gurbanov, A. V. (author) / Akhmedova, N. F. (author) / Mammadov, S. E. (author)

Published in:

Petroleum Chemistry ; 62 ; 933-941

Publication date:

2022-08-01

Size:

9 pages

ISSN:

1555-6239 , 0965-5441

DOI:

https://doi.org/10.1134/S0965544122060147

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

English

Keywords:

Ln-modified HZSM-5 , flow fixed-bed reactor , ethylbenzene , disproportionation , diethylbenzene Chemistry , Industrial Chemistry/Chemical Engineering , Chemistry and Materials Science

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