Surface barriers as dominant mechanism to transport limitations in hierarchically structured catalysts – Application to the zeolite-catalyzed alkylation of benzene with ethylene

Surface barriers as dominant mechanism to transport limitations in hierarchically structured catalysts – Application to the zeolite-catalyzed alkylation of benzene with ethylene Научная публикация

Конференция

XII International Conference on Chemical Reactors
19-23 сент. 2016 , London

Журнал

Chemical Engineering Journal
ISSN: 1385-8947

Вых. Данные

Год: 2017, Том: 329, Страницы: 45-55 Страниц : 11 DOI: 10.1016/j.cej.2017.04.015

Авторы

Rao Sanjeev M. ¹ , Saraçi Erisa ² , Gläser Roger ² , Coppens Marc-Olivier ³

Организации

1	Howard P. Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
2	Institute of Chemical Technology, University of Leipzig, Linnéstraβe 3, Leipzig 04103, Germany
3	Department of Chemical Engineering, University College London, Torrington Place, London WC1E 7JE, United Kingdom

The meso-macropore network of a hierarchically structured zeolite catalyst is numerically optimized to maximize the volume-integrated reaction yield in the ethylation of benzene to produce ethylbenzene over zeolite H-ZSM-5. A hierarchical approach is used at multiple length scales to determine the optimal pore network properties. The maximum volume-integrated reaction yield of the hierarchically structured zeolite catalyst containing meso- and macropores is nearly twice the yield of a zeolite pellet containing only macropores, at the same macroporosity. To bridge the gap between modeling and experiments, a series of physical mixtures of ZSM-5 crystals and mesoporous silica, containing different weight fractions of zeolite is synthesized and used in fixed bed reactor experiments to determine the optimal pellet structure to maximize the conversion of ethylene. Comparison with reactor simulations of the zeolite composites shows that the performance of the zeolite composites might be limited by surface barriers at the external surface of the zeolite crystals, rather than by diffusion limitations within the meso-macropore network of the pellets.

Rao S.M. , Saraçi E. , Gläser R. , Coppens M-O.
Surface barriers as dominant mechanism to transport limitations in hierarchically structured catalysts – Application to the zeolite-catalyzed alkylation of benzene with ethylene
Chemical Engineering Journal. 2017. V.329. P.45-55. DOI: 10.1016/j.cej.2017.04.015 WOS Scopus OpenAlex

Опубликована online:

6 апр. 2017 г.

Web of science:	WOS:000410765700006
Scopus:	2-s2.0-85017471859
OpenAlex:	W2604662144

БД	Цитирований
OpenAlex	57
Scopus	51